Engine Cooling System Cadillac STS I рестайлинг

Fastener Tightening Specifications

Scheme 1

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Engine Cooling

Begin the system diagnosis with the diagnostic system check. Refer to Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuits
3. The identification of any stored DTCs and their status

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) commands the fans ON in high speed or low speed. In low speed, the fans are configured in series. In high speed, the fans are configured in parallel.

In low speed operation, the ECM applies ground to the coil side of the low speed relay. Voltage is applied directly to the left cooling fan through the switch side of the low speed relay. The right fan is connected in series to the left fan through the de-energized series/parallel relay so that both fans operate at low speed.

In high speed operation, the ECM applies a ground to the coil side of the low speed relay, the series/parallel relay, and the high speed relay. Voltage is applied directly to the right cooling fan through the switch side of the high speed relay. The left cooling fan obtains voltage through the low speed relay and ground through the series/parallel relay.

When the ECM is commanding a fan relay ON, the voltage of the control circuit should be low, near 0 volts. When the ECM is commanding a fan relay OFF, the voltage of the control circuit should be high, near battery voltage.

Conditions for Running the DTC

1. The ignition is ON.
2. The system voltage is between 9-18 volts.
3. The relay control circuit is transitioned from OFF to ON or ON to OFF.

P0480

The ECM detects an open circuit in the low speed cooling fan relay control circuit.

P0481

1. The ECM detects an open circuit in the high speed cooling fan relay control circuit.
2. The above condition is present for 30 seconds.

Action Taken When the DTC Sets

DTCs P0480 and P0481 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0480 and P0481 are Type B DTCs.

Reference Information

Schematic Reference

1. «Engine Cooling Schematics»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Power Distribution Schematics»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Cooling Fan Description and Operation»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Engine Control Module Description»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction__engine-control-module-description) for the 4.4L engine
3. «Engine Control Module Description»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction__engine-control-module-description) for the 4.6L engine

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Electrical Center Identification Views»(/cadillac/sts/i-2007-2011/remont/electrical-component-locations/#wiring-systems-and-power-management-component-views)
4. «Probing Electrical Connectors»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__probing-electrical-connectors)
5. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
6. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 43244: Relay Puller Pliers

Circuit/System Verification

Verify cooling fan operation using the scan tool commands listed below

1. Fan relay 1 is ON-Both fans run at low speed.
2. Fan relays 2 and 3 are ON-The right fan runs at high speed, the left fan is OFF.
3. Fan relays 1, 2 and 3 are ON-Both fans run at high speed.

Circuit/System Testing

1. Ignition OFF, disconnect the 3 cooling fan relays listed below: Lo fan SPD relay HI fan SPD relay Fan S/P relay
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 85 of each relay and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
3. Verify that a test lamp does not illuminate between the ignition circuit terminal 85 and the control circuit terminal 86 of each relay. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit test normal, replace the ECM.
4. Remove the test lamp.
5. Ignition ON, command the affected relay ON using a scan tool. Verify the affected scan tool FC Relay Control Ckt. Short Volts Test Status parameter is OK. For the Lo Fan SPD relay, use the scan tool Fan Relay 1 command. For the HI Fan SPD and Fan S/P relays, use the scan tool Relay 2 and 3 command. If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM
6. Install a 3A fused jumper wire between the control circuit terminal 86 and the ignition circuit terminal 85. Command the affected relay ON with a scan tool. Verify the scan tool Relay Control Ckt Short Volts Test Status parameter is Fault. If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits and the ECM test normal, replace the affected relay.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Relay Replacement (Attached to Wire Harness)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
3. «Underhood Electrical Center or Junction Block Replacement»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
4. «Control Module References»(/cadillac/sts/i-2007-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Diagnostic Instructions (V6)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information (V6)

Circuit/System Description (V6)

The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

In low speed operation, the ECM applies ground to the coil side of the low speed fan relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the relay. The left fan is connected in series to the right cooling fan through the de-energized series/parallel (S/P) fan relay. The series circuit operates both fans at low speed.

In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the S/P fan relay, and the high speed fan relay. When energized, the high speed fan relay applies voltage directly to the right cooling fan through the switch side of the relay. Simultaneously, the low speed fan relay and the S/P fan relay provide ignition voltage and a direct path to ground for the left cooling fan. With both fans connected in a parallel circuit, each fan receives full voltage and operates at high speed.

Conditions for Running the DTC (V6)

1. The ignition voltage is between 8-18 volts.
2. The engine speed is more than 40 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.

The ECM detects an open on the low speed cooling fan relay control circuit for more than 1 second.

The ECM detects an open circuit on the high speed cooling fan relay control circuit for more than 1 second.

P0691

The ECM detects a short to ground on the low speed cooling fan relay control circuit for more than 1 second.

P0692

The ECM detects a short to voltage on the low speed cooling fan relay control circuit for more than 1 second.

P0693

The ECM detects a short to ground on the high speed cooling fan relay control circuit for more than 1 second.

P0694

The ECM detects a short to voltage on the high speed cooling fan relay control circuit for more than 1 second.

Action Taken When the DTC Sets (V6)

DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.

Conditions for Clearing the MIL/DTC (V6)

DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.

Reference Information (V6)

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification (V6)

1. Ignition ON, command the appropriate fan relay ON and OFF with a scan tool. Listen or feel the relay click.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing (V6)

1. Ignition OFF, disconnect all three cooling fan relays.
2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below: Low and high speed fan relays terminal 85 S/P fan relay terminal 86 If the test lamp does not illuminate, test the relay coil ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay coil ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
3. Test for 2.6-4.6 volts between ground and the relay coil control circuit terminal listed below: Low and high speed fan relays terminal 86 S/P fan relay terminal 85 If less than the specified range, test the relay coil control circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Connect a test lamp between the relay coil control circuit and the relay coil ignition circuit, terminals 85 and 86.
5. Command the fan relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, replace the ECM.
6. If all circuits test normal, test or replace the relay.

Component Testing (V6)

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86. If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified range, replace the relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the relay.
5. Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than the specified range, replace the relay.

Repair Procedures (V6)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
2. «Control Module References»(/cadillac/sts/i-2007-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of the diagnostic category.

The engine control module (ECM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an over-termperature condition. This condition occurs when the coolant temperature is above a calibrated value for a calibrated length of time. The ECM will disable half of the cylinders by turning OFF the fuel injectors. By disabling half of cylinders, the ECM is able to reduce the temperature of the coolant.

1. The engine is running for greater than 30 seconds.
2. DTC P0116, P0117, P0118, or P0128 are not set.

Conditions for Setting the DTC (V6)

The EM detects that engine coolant temperature is greater than 136°C (277°F) for more than 1 second or a cumulative time of 10 seconds.

1. DTC P1258 is a Type A DTC.
2. The engine will operate in the Overheated Engine Protection Operating Mode.
3. The instrument panel (IP) will illuminate the coolant indicator lamp and the driver information center (DIC), if equipped, may display a message.

Conditions for Clearing the DTC (V6)

DTC P1258 is a Type A DTC.

Description and Operation

1. «Cooling System Description and Operation»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Instrument Cluster Description and Operation»(/cadillac/sts/i-2007-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
3. «Indicator/Warning Message Description and Operation»(/cadillac/sts/i-2007-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges__indicatorwarning-message-description-and-operation)
4. «Audible Warnings Description and Operation»(/cadillac/sts/i-2007-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges__audible-warnings-description-and-operation)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Observe the engine coolant level. The engine coolant level should be within operating range. Refer to Capacities - Approximate Fluid, and Engine Coolant in the Owner's Manual.
2. Ensure that the vehicle has the correct engine coolant, with correct concentration, and is not old, contaminated or contains additives. Refer to Recommended Fluids and Lubricants in the Owner's Manual.
3. Inspect the cooling system for the following: Cooling system leaks Kinked or pinched hoses, especially at the radiator Loose, missing, or damaged radiator air seals or deflectors The radiator and A/C condenser for any air flow obstructions or bent fins-Refer to «Symptoms - Engine Cooling»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__symptoms-engine-cooling) .
4. Command the cooling fans in both low and high speed. If the cooling fans do not operate in both speeds, refer to «Cooling Fan Inoperative (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Inoperative (w/RPO LC3 or LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Test the thermostat for correct operation. Refer to «Thermostat Diagnosis»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Test the engine cooling system for overheating. Refer to «Engine Overheating»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Inspect the water pump and coolant flow for correct operation. Refer to «Water Pump Replacement (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Water Pump Replacement (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Water Pump Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Inspect the engine mechanical for worn/leaking/cracked cylinder heads and engine block. Refer to «Coolant in Combustion Chamber»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-1-of-6__coolant-in-combustion-chamber) and «Coolant in Engine Oil»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-1-of-6__coolant-in-engine-oil) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Diagnostic Instructions (with RPO LC3 or LH2)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description (with RPO LC3 or LH2)

The engine control module (ECM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an overtermperature condition. This condition occurs when the coolant temperature is above a calibrated value for a calibrated length of time. The ECM will disable half of the cylinders by turning OFF the fuel injectors. By disabling half of cylinders, the ECM is able to reduce the temperature of the coolant.

Conditions for Running the DTC (with RPO LC3 or LH2)

1. The engine is running.
2. DTCs P0116, P0117, P0118, or P0128 are not set.

Conditions for Setting the DTC (with RPO LC3 or LH2)

Coolant temperature more than 131°C (267.8°F) for more than 7 seconds.

Action Taken When the DTC Sets (with RPO LC3 or LH2)

1. DTC P1258 is a Type A DTC.
2. The engine will operate in the Overheated Engine Protection Operating Mode.
3. The instrument panel (IP) will illuminate the coolant indicator lamp and the driver information center (DIC), if equipped, may display a message.

Conditions for Clearing the DTC (with RPO LC3 or LH2)

DTC P1258 is a Type A DTC.

Reference Information (with RPO LC3 or LH2)

Description and Operation

1. «Cooling System Description and Operation»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Instrument Cluster Description and Operation»(/cadillac/sts/i-2007-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
3. «Indicator/Warning Message Description and Operation»(/cadillac/sts/i-2007-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges__indicatorwarning-message-description-and-operation)
4. «Audible Warnings Description and Operation»(/cadillac/sts/i-2007-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges__audible-warnings-description-and-operation)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification (with RPO LC3 or LH2)

1. Observe the engine coolant level. The engine coolant level should be within operating range. Refer to Capacities - Approximate Fluid, and Engine Coolant in the Owner's Manual.
2. Ensure that the vehicle has the correct engine coolant, with correct concentration, and is not old, contaminated or contains additives. Refer to Recommended Fluids and Lubricants in the Owner's Manual.
3. Inspect the cooling system for the following: Cooling system leaks Kinked or pinched hoses, especially at the radiator Loose, missing, or damaged radiator air seals or deflectors The radiator and A/C condenser for any air flow obstructions or bent fins-Refer to «Symptoms - Engine Cooling»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__symptoms-engine-cooling) .
4. Command the cooling fans in both low and high speed. If the cooling fans do not operate in both speeds, refer to «Cooling Fan Inoperative (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Inoperative (w/RPO LC3 or LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Circuit/System Testing (with RPO LC3 or LH2)

1. Test the thermostat for correct operation. Refer to «Thermostat Diagnosis»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Test the engine cooling system for overheating. Refer to «Engine Overheating»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Inspect the water pump and coolant flow for correct operation. Refer to «Water Pump Replacement (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Water Pump Replacement (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Water Pump Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Inspect the engine mechanical for worn/leaking/cracked cylinder heads and engine block. Refer to «Coolant in Combustion Chamber»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-1-of-6__coolant-in-combustion-chamber) and «Coolant in Engine Oil»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-1-of-6__coolant-in-engine-oil) for the 4.4L engine, or «Coolant in Combustion Chamber»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-1-of-6__coolant-in-combustion-chamber) and «Coolant in Engine Oil»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-1-of-6__coolant-in-engine-oil) for the 4.6L engine.

Repair Procedures (with RPO LC3 or LH2)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Typical Scan Tool Data

Aux. Coolant Pump Ckt. Short Gnd, Open, and Short Volts Test Status - Component Commanded OFF

Aux. Coolant Pump Ckt. Short Gnd, Open, and Short Volts Test Status - Component Commanded ON

The auxiliary coolant pump system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump ON when the engine coolant temperature exceeds a calibrated value after engine shut down. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay.

P2600, P2602, or P2603

1. The engine speed is greater than 80 RPM.
2. The ignition voltage is between 10-18 volts.
3. The ECM has commanded the pump ON and OFF at least once during the ignition cycle.
4. The DTCs run continuously once the above conditions are met.

P2601

1. DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0119, P02600, P02602, and P02603 are not set.
2. The engine coolant temperature at shut down is greater than 110 °C (230 °F) for longer than 70 seconds.
3. The DTC run continuously once the above conditions are met.

P2600

The ECM detects the pump control circuit is open. The condition exists for 4 seconds or a cumulative of 50 seconds.

The ECM detects the engine coolant temperature remains greater than 110 °C (230 °F) for more than 4 seconds or a cumulative of 30 seconds.

P2602

The ECM detects the pump control circuit is shorted to ground. The condition exists for 4 seconds or a cumulative of 30 seconds.

P2603

The ECM detects the pump control circuit is shorted to voltage. The condition exists for 4 seconds or a cumulative of 30 seconds.

The DTCs are Type C DTCs.

The DTCs are Type C DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, command the auxiliary coolant pump relay ON and OFF with the scan tool. An audible click should be heard when changing between the commanded states.
2. Start the engine, observe the DTC information with a scan tool. DTCs P2600, P2602, or P2603 should not set.
3. Ignition ON, engine off observe the DTC information with a scan tool. DTC P2601 should not set. If DTC P2601 is set refer to the following links: «After Boil Coolant Pump Always On»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) «After Boil Coolant Pump Inoperative»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) «After Boil Coolant Pump Malfunction»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Ignition OFF, disconnect the harness connector at the auxiliary coolant pump relay.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 85 and ground. If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
3. Test for 2.6-4.6 volts between the control circuit terminal 86 and ground. If less than the specified range, test the control circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Connect a test lamp between the control circuit terminal 86 and the ignition voltage circuit terminal 85.
5. Command the auxiliary coolant pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, replace the ECM.
6. If all circuits/connections test normal, test or replace the auxiliary coolant pump relay.

Component Testing

1. Ignition OFF, disconnect the auxiliary coolant pump relay.
2. Test for 70-110 ohms between terminals 85 and 86. If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
4. Connect a 20-amp fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative terminal of the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay. If greater than the specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

Symptoms - Engine Cooling

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Cooling System. Refer to «Checking Aftermarket Accessories»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. Inspect the surge tank reservoir for the proper coolant level.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Cooling Fan Always On (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Always On (with RPO LC3 or LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Cooling Fan Inoperative (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Inoperative (w/RPO LC3 or LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Overheating»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
4. «Loss of Coolant (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant-lc3) or «Loss of Coolant (LH2, LY7, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant-lh2-ly7-llt)
5. «Thermostat Diagnosis»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
6. «Engine Fails To Reach Normal Operating Temperature»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
7. «After Boil Coolant Pump Always On»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
8. «After Boil Coolant Pump Inoperative»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
9. «After Boil Coolant Pump Malfunction»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
10. «Pressure Cap Testing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
11. «Cooling System Leak Testing (Charge Air Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Leak Testing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)

The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

In low speed operation, the ECM applies ground to the coil side of the low speed fan relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the low relay. The left fan is connected in series to the right cooling fan through the de-energized series/parallel (S/P) fan relay. The series circuit operates both fans at low speed.

In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the S/P fan relay, and the high speed fan relay. When energized, the high speed fan relay applies voltage directly to the right cooling fan through the switch side of the relay. Simultaneously, the low speed fan relay and the S/P fan relay provide ignition voltage and a direct path to ground for the left cooling fan. With both fans connected in a parallel circuit, each fan receives full voltage and operates at high speed.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTCs P0480, P0481, P0691, P0692, P0693 and P0694 are not set. If any cooling system DTCs are set, repair the DTC first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) .
2. Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
3. Ignition ON, observe that the fan is not activated.

1. Ignition OFF, disconnect each cooling fan relay one at a time.
2. Ignition ON, observe that the cooling fans are not activated. If the fans are activated, test for a short to voltage in the relay controlled output circuit. If the fans are not activated, test or replace the cooling fan relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center)

The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

In low speed operation, the ECM applies ground to the coil side of the low speed fan relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the low relay. The left fan is connected in series to the right cooling fan through the de-energized series/parallel (S/P) fan relay. The series circuit operates both fans at low speed.

In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the S/P fan relay, and the high speed fan relay. When energized, the high speed fan relay applies voltage directly to the right cooling fan through the switch side of the relay. Simultaneously, the low speed fan relay and the S/P fan relay provide ignition voltage and a direct path to ground for the left cooling fan. With both fans connected in a parallel circuit, each fan receives full voltage and operates at high speed.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTCs P0480, P0481, P0691, P0692, P0693 and P0694 are not set. If any cooling system DTCs are set, repair the DTC first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) .
2. Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
3. Ignition ON, observe that the fan is not activated.

1. Ignition OFF, disconnect each cooling fan relay one at a time.
2. Ignition ON, observe that the cooling fans are not activated. If the fans are activated, test for a short to voltage in the relay controlled output circuit. If the fans are not activated, test or replace the appropriate cooling fan relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

In low speed operation, the ECM applies ground to the coil side of the low speed fan relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the low relay. The left fan is connected in series to the right cooling fan through the de-energized series/parallel (S/P) fan relay. The series circuit operates both fans at low speed.

In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the S/P fan relay, and the high speed fan relay. When energized, the high speed fan relay applies voltage directly to the right cooling fan through the switch side of the relay. Simultaneously, the low speed fan relay and the S/P fan relay provide ignition voltage and a direct path to ground for the left cooling fan. With both fans connected in a parallel circuit, each fan receives full voltage and operates at high speed.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTCs P0480, P0481, P0691, P0692, P0693 and P0694 are not set. If any cooling system DTCs are set, repair the DTC first. Refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, command the appropriate fan relay ON and OFF with a scan tool. Verify that the fans turn ON and OFF when changing between the commanded states.

1. Ignition OFF, disconnect the cooling fan relays.
2. Connect a 30A fused jumper between the relay switch circuit terminal 30 and the ground circuit terminal 87 at the S/P fan relay connector. This will complete the left side fan ground circuit. Leave this jumper in place for the remainder of this procedure.
3. Ignition ON, verify that a test lamp illuminates between the relay switch ignition circuit terminal 30 and ground. If the test lamp does not illuminate, test the appropriate relay switch B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay switch B+ circuit fuse is open, test the relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the relay.
4. Connect a 30A fused jumper between the relay switch B+ circuit terminal 30 and the relay controlled output circuit terminal 87. Verify the appropriate fan is activated If the appropriate fan does not activate, test the relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal, test the fan ground circuit for an open/high resistance. If the circuit tests normal, replace the fan.
5. Install the S/P fan relay. Verify both fans activate at low speed. If both fans do not activate, test the relay controlled output circuit terminal 87A of the S/P fan relay for a short to ground or an open/high resistance.
6. If all circuits test normal, test or replace the relay.

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms of resistance between terminals 85 and 86. If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified range, replace the relay.
4. Test for less than 2 ohms of resistance between terminals 30 and 87A. If greater than the specified range, replace the relay.
5. Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87. If greater than the specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
2. «Engine Coolant Fan Motor Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of the diagnostic category.

The engine control module (ECM) commands the fans ON in high speed or low speed. In low speed, the fans are configured in series. In high speed, the fans are configured in parallel.

In low speed operation, the ECM applies ground to the coil side of the low speed relay. Voltage is applied directly to the left cooling fan through the switch side of the low speed relay. The right fan is connected in series to the left fan through the de-energized series/parallel relay so that both fans operate at low speed.

In high speed operation, the ECM applies a ground to the coil side of the low speed relay, the series/parallel relay, and the high speed relay. Voltage is applied directly to the right cooling fan through the switch side of the high speed relay. The left cooling fan obtains voltage through the low speed relay and ground through the series/parallel relay.

When the ECM is commanding a fan relay ON, the voltage of the control circuit should be low, near 0 volts. When the ECM is commanding a fan relay OFF, the voltage of the control circuit should be high, near battery voltage. If the ECM detects that the actual voltage of the relay control circuit is different than the expected voltage, DTC P0480 or P0481 will set and the affected ECM driver will be disabled.

Schematic Reference

1. «Electrical Center Identification Views»(/cadillac/sts/i-2007-2011/remont/electrical-component-locations/#wiring-systems-and-power-management-component-views)
2. «Engine Cooling Schematics»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. If DTCs P0480 or P0481 are set, then perform those diagnostics first.
2. Ignition ON, command each relay ON and OFF with a scan tool. Feel or listen to verify that each relay turns ON and OFF with each command.

1. Ignition OFF, disconnect the S/P relay.
2. Ignition ON, activate the cooling fan relay 1 with the scan tool. The fan should be OFF. If the fan is activated, test the left fan ground circuit for a short to ground.
3. Ignition OFF, disconnect the fan relays.
4. Connect a 30A fused jumper between the normally-open switch contact terminals at the S/P relay connector in order to complete the left fan ground circuit. Leave this jumper in place for the remainder of this procedure.
5. One at a time, connect a 30A fused jumper between the positive terminal at the battery and the fan voltage supply circuit terminal at the low speed fan and the high speed fan relay connections and verify fan activation. If the appropriate fan does not activate, test the fan voltage supply circuit for a short to ground or open/high resistance. If the circuit tests normal, test the fan ground circuit for an open/high resistance. If the circuits test normal, replace the fan.
6. Ignition ON, connect a 30A fused jumper between the relay switch voltage supply circuit terminal and the fan voltage supply circuit terminal at the low speed fan and the high speed fan relay connections and verify fan activation. If the fan does not activate, test the relay switch voltage supply circuit for a short to ground or high resistance. If the circuit tests normal and its fuse is open, test all connected components and replace as necessary.
7. If the circuits and fans test normal, replace the relay.

Repair Verification

Ignition ON, command the relay ON and OFF with a scan tool. Observe to verify that the fan turns ON and OFF with each command.

The auxiliary coolant pump system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump On when the engine coolant temperature exceeds a calibrated value. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTCs P2600, P2602 and P2603 are not set. If any auxiliary coolant pump DTCs are set, repair the DTC first. Refer to «DTC P2600-P2603»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, verify with a scan tool that the ECM is not commanding pump activation.
3. Ignition ON, observe that the pump is not activated.

1. Ignition OFF, disconnect FUEL COOL relay.
2. Ignition ON, observe that the auxiliary coolant pump is not activated. If the pump is activated, test for a short to voltage in the relay controlled output circuit. If the pump is not activated, test or replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The auxiliary coolant pump system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump On when the engine coolant temperature exceeds a calibrated value. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTCs P2600, P2602 and P2603 are not set. If any auxiliary coolant pump DTCs are set, repair the DTC first. Refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, command the auxiliary coolant pump relay ON and OFF with a scan tool. Verify that the pump turns ON and OFF when changing between the commanded states.

1. Ignition OFF, disconnect the FUEL COOL Relay.
2. Ignition ON, verify that a test lamp illuminates between the relay switch ignition circuit and ground. If the test lamp does not illuminate, test the relay switch ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay switch ignition circuit fuse is open, test the appropriate relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the relay.
3. Connect a 10A fused jumper between the relay switch ignition circuit and the relay controlled output circuit. Verify the pump is activated If the pump activates, test or replace the relay.

1. If the pump does not activate, test the relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal, test the pump ground circuit for an open/high resistance. If the circuit tests normal, replace the pump.

1. Ignition OFF, disconnect the auxiliary coolant pump relay.
2. Test for 70-110 ohms of resistance between terminals 85 and 86. If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
4. Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87. If greater than the specified value, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/cadillac/sts/i-2007-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
2. «Auxiliary Water Pump Inlet Hose Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Auxiliary Water Pump Outlet Hose Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
4. «Auxiliary Water Pump Replacement (4.6L (LH2) w/RPOs V03/V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Auxiliary Water Pump Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)

The auxiliary coolant pump system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump On when the engine coolant temperature exceeds a calibrated value. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay.

Description and Operation

Cooling System Description and Operation

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTCs P2600, P2602 and P2603 are not set. If any auxiliary coolant pump DTCs are set, repair the DTC first. Refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, command the auxiliary coolant pump relay ON and OFF with a scan tool. Verify that the pump turns ON and OFF when changing between the commanded states. If the auxiliary coolant pump does not activate, refer to «After Boil Coolant Pump Inoperative»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Test for a blockage or restriction in the auxiliary coolant pump lines and hoses.
2. Test the pump coolant passage for a blockage or a restriction.
3. Test the pump impeller for a seized or binding condition.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Auxiliary Water Pump Replacement (4.6L (LH2) w/RPOs V03/V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Auxiliary Water Pump Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Auxiliary Water Pump Inlet Hose Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Auxiliary Water Pump Outlet Hose Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)

Diagnostic Aids

The engine may overheat due to an intermittent operation of one of the following components

1. The after boil heater pump
2. The coolant bypass solenoid
3. The coolant bypass valve
4. The mechanical cooling fan
5. The electric cooling fans
6. The thermostat

For electrical inspection of the cooling fans and the after boil heater pump, refer to Testing for Intermittent Conditions and Poor Connections .

Loss of Coolant (LC3)

Loss of Coolant (LH2, LY7, LLT)

Tools Required

J 24731 Tempilstick. See Special Tools .

The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a pencil like device. It has a wax material containing certain chemicals which melt at a given temperature. Temperature sticks can be used to determine a thermostat operating range, by rubbing 87°C (188°F) and 97°C (206°F) sticks on the outlet coolant pipe, located between the thermostat housing and the inlet radiator hose.

1. Use a tempilstick in order to find the opening and the closing temperatures of the coolant thermostat. J 24731-188 tempilstick melts at 87°C (188°F). The thermostat should begin to open at 90°C (194°F). J 24731-206 tempilstick melts at 97°C (206°F). The thermostat should be fully open at 107°C (225°F).
2. Replace the coolant thermostat if it does not operate properly between this temperature range.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The optional coolant heater operates using 110-volt AC external power and is designed to warm the coolant in the engine block area for improved starting in very cold weather. There is an internal thermal switch in the power cord that prevents operation above -18°C (0°F). The coolant heater helps reduce fuel consumption when a cold engine is warming up. The unit is equipped with a detachable AC power cord. A weather shield on the cord is provided to protect the plug when not in use.

Electrical Information Reference

1. «Circuit Testing»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/sts/i-2007-2011/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Note. The power supply cord will read open due to an internal thermal switch if the ambient temperature is above -18°C (0°F).

1. Test the engine coolant heater for an open or short to ground. If open or shorted, replace the heater.
2. If the heater tests normal, replace the coolant heater power cord.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Coolant Heater Replacement (LY7, KO5, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Replacement (LC3 (K05))»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Replacement (LH2, KA3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Replacement (LH2, KO5)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Coolant Heater Cord Replacement (LY7, KO5)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Cord Replacement (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Cord Replacement (LH2, K05, KA3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Cord Replacement (V6)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system)

The engine may fail to reach normal operating temperature due to an intermittent operation of one of the following components

1. The thermostat
2. The electric fan system
3. The mechanical fan system

For electrical inspection of the electrical fan system, refer to Testing for Intermittent Conditions and Poor Connections .

Special Tools

1. J 24460-01 Cooling System Pressure Tester. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 42401 Radiator Cap/Surge Tank Test Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Pressure Cap Testing

1. Remove the pressure cap.
2. Wash the pressure cap sealing surface with water.
3. Use the J 24460-01 (1) with J 42401 (2) in order to test the pressure cap. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Test the pressure cap for the following conditions: Pressure release when the J 24460-01 exceeds the pressure rating of the pressure cap. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Maintain the rated pressure for at least 10 seconds Note the rate of pressure loss.
5. Replace the pressure cap under the following conditions: The pressure cap does not release pressure which exceeds the rated pressure of the cap. The pressure cap does not hold the rated pressure.

1. J 24460-01 Cooling System Pressure Tester. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 46143 Cooling System Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Cooling System Leak Testing

1. Remove the charge air coolant pressure cap.
2. Test the operation of the charge air coolant pressure cap. Refer to «Pressure Cap Testing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Wash the charge air coolant pressure cap mating surface with water.
4. Use the J 24460-01 (1) with J 46143 (2) in order to apply pressure to the charge air cooling system. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Do not exceed the pressure cap rating.
5. The charge air cooling system should hold the rated pressure for at least 2 minutes. Observe the gage for any pressure loss.
6. Repair any leaks as required.

1. J 24460-01 Cooling System Pressure Tester. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 42401 Radiator Cap/Surge Tank Test Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the pressure cap.
2. Test the operation of the pressure cap. Refer to «Pressure Cap Testing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Wash the pressure cap mating surface with water.
4. Use the J 24460-01 (1) with J 42401 (2) in order to apply pressure to the cooling system. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Do not exceed the pressure cap rating.
5. The cooling system should hold the rated pressure for at least 2 minutes. Observe the gage for any pressure loss.
6. Repair any leaks as required.

Fan Clutch Diagnosis

1. J 26568 Coolant and Battery Fluid Tester. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 42401 Radiator Cap and Surge Tank Test Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. GE-47716 Vac N Fill Coolant Refill Tool. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Draining Procedure

1. Park the vehicle on a level surface.
2. Remove the surge tank cap.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Remove the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Place a drain pan under the radiator.
6. Insert a piece of clean flexible hose through the access hole in the cradle onto the radiator mounting pin.
7. Slowly loosen the drain cock and drain the coolant into the drain pan. Do not completely remove the drain cock.
8. Inspect the engine coolant for the following conditions: Discolored appearance-Follow the flush procedure. Refer to «Flushing (Charge Air Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) or «Flushing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) . Normal in appearance-Follow the Vac N Fill Procedure below.
9. Tighten the drain cock.

Vac N Fill Procedure

1. Install the J 42401 onto the coolant surge tank. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Attach the Vac N Fill cap to the J 42401 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Attach the vacuum gage assembly to the Vac N Fill cap.
4. Attach the fill hose to the barb fitting on the vacuum gage assembly. Ensure that the valve is closed.
5. Pour the coolant mixture into the graduated reservoir.
6. Place the fill hose in the graduated reservoir.
7. Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
8. Attach the venturi assembly to the vacuum tank.
9. Attach a shop air hose to the venturi assembly. Ensure the valve on the venturi assembly is closed.
10. Attach the vacuum hose to the vacuum gage assembly and the vacuum tank.
11. Open the valve on the venturi assembly. The vacuum gage will begin to rise and a hissing noise will be present.
12. Continue to draw vacuum until the needle stops rising. This should be 610-660 mm Hg (24-26 in Hg). Cooling hoses may start to collapse. This is normal due to vacuum draw.
13. To aid in the fill process, position the graduated reservoir above the coolant fill port.
14. Slowly open the valve on the vacuum gage assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose.
15. Close the valve on the venturi assembly.
16. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum and monitor for vacuum loss. If vacuum loss is observed, refer to «Loss of Coolant (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant-lc3) or «Loss of Coolant (LH2, LY7, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant-lh2-ly7-llt) .
17. Open the valve on the vacuum gage assembly. The vacuum gage will drop as coolant is drawn into the system.
18. Once the vacuum gage reaches zero, close the valve on the vacuum gage assembly and repeat steps 11-17.
19. Detach the Vac N Fill cap from the J 42401 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
20. Remove the J 42401 from the coolant surge tank. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
21. Add coolant to the system as necessary.
22. Inspect the concentration of the coolant mixture using J 26568 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
23. Detach the vacuum hose from the vacuum gage assembly.
24. Attach the extraction hose to the vacuum hose.
25. Open the valve on the venturi assembly to start a vacuum draw.
26. Use the extraction hose to draw out coolant to the proper level.
27. The vacuum tank has a drain valve on the bottom of the tank. Open the valve to drain coolant from the vacuum tank into a suitable container for disposal.
28. Install the surge tank cap.

J 26568 Coolant and Battery Fluid Tester. See Special Tools .

1. Park the vehicle on a level surface.
2. Remove the surge tank cap.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Remove the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Place a drain pan under the radiator.
6. Insert a piece of clean flexible hose through the access hole in the cradle onto the radiator mounting pin.
7. Slowly loosen the drain cock and drain the coolant into the drain pan. Do not completely remove the drain cock.
8. Inspect the engine coolant for the following conditions: Discolored appearance-Follow the flush procedure. Refer to «Flushing (Charge Air Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) «Flushing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) . Normal in appearance-Follow the Fill Procedure below.

Fill Procedure

1. Close the radiator drain cock.
2. Install the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
3. Lower the vehicle.
4. Slowly add a mixture of 50/50 DEX-COOL antifreeze and clean drinkable water to the cooling system through the top of the surge tank opening. Refer to «Approximate Fluid Capacities»(/cadillac/sts/i-2007-2011/remont/lubrication-system/#maintenance-and-lubrication__approximate-fluid-capacities) .
5. Slowly fill the cooling system until the coolant stabilizes at 25 mm (1 inch) above the FULL COLD mark on the surge tank.
6. Install the surge tank cap.
7. Start the engine.
8. Run the engine at 2,000-2,500 RPM until the engine reaches normal operating temperature.
9. Allow the engine to idle for 3 minutes.
10. Shut the engine OFF.
11. Allow the engine to cool.
12. Add or remove coolant as necessary from the surge tank until the level is stabilized at the FULL COLD mark.
13. Inspect the cooling system for leaks.
14. Using J 26568 inspect the concentration of the engine coolant. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Charge Air Cooling System Coolant Level Inspection

1. Remove the intake manifold sight shield. Refer to «Intake Manifold Sight Shield Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
2. Verify that the coolant is at the cold fill line on the charge air cooling system fill neck.
3. Verify that the coolant is at the cold fill line on the charge air cooling system reservoir.
4. Add coolant as necessary to the fill neck and reservoir to bring the coolant level to the cold fill line.
5. Install the intake manifold sight shield. Refer to «Intake Manifold Sight Shield Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .

J 26568 Coolant and Battery Tester. See Special Tools .

1. Remove the charge air cooling system pressure cap (1).
2. Remove the charge air coolant cap (2).
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Place a drain pan under the charge air coolant radiator.
6. Remove the charge air coolant radiator drain plug.
7. Drain the charge air cooling system.
8. Inspect the coolant.
9. Follow the appropriate procedure based on the condition of the coolant. Normal in appearance - follow the filling procedure. Discolored - follow the flush procedure. Refer to «Flushing (Charge Air Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) or «Flushing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) .
10. Install the charge air coolant radiator drain plug and tighten to 10 N.m (89 lb in).
11. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
12. Lower the vehicle.

Filling Procedure

1. Loosen the charge air coolant radiator vent plug.
2. Place a shop towel around the charge air coolant radiator vent plug to absorb any leakage.
3. Using a small funnel, slowly fill the charge air cooling system through the charge air coolant cap port with a 50/50 coolant mixture until coolant is present at the charge air coolant radiator vent plug.
4. Hand tighten the charge air coolant radiator vent plug.
5. Using a small funnel, continue to slowly fill the charge air cooling system through the charge air coolant cap port until coolant is level with the charge air coolant cap port.
6. Install the charge air coolant cap.
7. Install the charge air coolant cap bolts and tighten to 10 N.m (89 lb in).
8. Slowly fill the charge air cooling system through the charge air coolant fill neck until coolant reaches the COLD FILL mark.
9. Cycle the charge air cooling pump ON and continue to slowly fill through the charge air coolant fill neck until the level stabilizes at the COLD FILL mark.
10. Slowly loosen the charge air coolant radiator vent plug until coolant is present.
11. Remove the shop towel from around the vent port.
12. Tighten the charge air coolant radiator vent plug to 10 N.m (89 lb in).
13. Continue to slowly fill through the charge air coolant fill neck until the level has stabilized at the COLD FILL mark.
14. Cycle the charge air coolant pump OFF.
15. Remove the charge air coolant cap bolts.
16. Remove the charge air coolant cap.
17. Ensure that coolant is almost level with the coolant cap fill port. Top off with the 50/50 coolant mixture through the charge air coolant cap port, if necessary.
18. Install the charge air coolant cap.
19. Install the charge air coolant cap bolts and tighten to 10 N.m (89 lb in).
20. Cycle the charge air coolant pump ON for 3 minutes.
21. Cycle the charge air coolant pump OFF.
22. Fill through the charge air coolant fill neck until the level stabilizes at the COLD FILL mark.
23. Repeat steps 19-21 until level is stabilized at the COLD FILL mark with the charge air coolant pump in the OFF position.
24. Inspect the concentration of the engine coolant, using the J 26568 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
25. Install the charge air cooling system pressure cap.
26. Inspect the charge air cooling system for leaks.

1. J 26568 Coolant and Battery Fluid Tester. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 46143 Cooling System Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. GE-47716 Vac N Fill Coolant Refill Tool. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the charge air cooling system pressure cap (1).
2. Remove the charge air coolant cap (2).
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Place a drain pan under the charge air coolant radiator.
6. Remove the charge air coolant radiator drain plug.
7. Drain the charge air cooling system.
8. Inspect the coolant.
9. Follow the appropriate procedure based on the condition of the coolant. Normal in appearance- follow the filling procedure. Discolored- follow the flush procedure. Refer to «Flushing (Charge Air Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) or «Flushing (Powertrain)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) .
10. Install the charge air coolant radiator drain plug and tighten to 10 N.m (89 lb in).
11. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
12. Lower the vehicle.

Vac - N - Procedure

1. Install the J 46143 onto the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Attach the Vac-N-Fill cap to the J 46143 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Attach the vacuum gage assembly to the Vac-N-Fill cap.
4. Attach the fill hose to the barb fitting on the vacuum gage assembly. Ensure the valve is closed.
5. Pour the coolant mixture into the graduated reservoir.
6. Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
7. Attach a shop air hose to the venturi assembly. Ensure the valve on the venturi assembly is closed.
8. Attach the vacuum hose to the vacuum gage assembly and the vacuum tank.
9. Open the valve on the venturi assembly. The vacuum gage will begin to rise and a hissing noise will be present.
10. Continue to draw vacuum until the needle stops rising. This should be 610-660 mm Hg (24-26 in Hg). Cooling hoses may start to collapse. This is normal due to vacuum draw.
11. To aid in the fill process, position the graduated reservoir above the fill neck.
12. Slowly open the valve on the vacuum gage assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose.
13. Close the valve on the venturi assembly.
14. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum and monitor for vacuum loss. If vacuum loss is observed, refer to «Loss of Coolant (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant-lc3) or «Loss of Coolant (LH2, LY7, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant-lh2-ly7-llt) .
15. Open the valve on the vacuum gage assembly. The vacuum gage will drop as coolant is drawn into the system.
16. Once the vacuum reaches zero, close the valve on the vacuum gage assembly and repeat steps 11 and 17.
17. Detach the Vac-N-Fill cap from the J 46143 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
18. Remove the J 46143 from the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
19. Add coolant to the system as necessary.
20. Inspect the concentration of the coolant mixture using J 26568 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
21. Detach the vacuum hose from the vacuum gage assembly.
22. Attach the extraction hose to the vacuum hose.
23. Open the valve on the venturi assembly to start a vacuum draw.
24. Use the extraction hose to draw out the coolant to the proper level.
25. The vacuum tank has a drain valve on the bottom of the tank. Open the valve to drain coolant from the vacuum tank into a suitable container for disposal.
26. Install the charge air cooling system pressure cap.

Flushing (Charge Air Cooling)

Note. Do not use a chemical flush. Store used coolant in the proper manner, such as in a used engine coolant holding tank. Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.

1. Follow the drain and fill procedure using only clean drinkable water. Repeat the procedure if necessary, until the fluid is nearly colorless. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Fill the cooling system to specifications when flushing is complete. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Flushing (Powertrain)

Note. Do not use a chemical flush. Store used coolant in the proper manner, such as in a used engine coolant holding tank. Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound. Various methods and equipment can be used to flush the cooling system. If special equipment is used, such as a back flusher, follow the manufacturer's instruction. However, always remove the thermostat before back flushing the system.

1. Block the drive wheels.
2. Place the transmission in PARK (P).
3. Engage the park brake.
4. Run the engine until the thermostat opens.
5. Stop the engine.
6. Follow the drain and fill procedure using only clean drinkable water. Repeat the procedure if necessary, until the fluid is nearly colorless. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Fill the cooling system when flushing is complete. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Radiator Cleaning (Charge Air Cooling)

1. Some conditions may require the use of warm water and a mild detergent.
2. Clean the A/C condenser fins.
3. Clean between the A/C condenser and charge air coolant radiator.
4. Clean the charge air coolant radiator cooling fins.
5. Straighten any damaged cooling fins.

Radiator Cleaning (Powertrain)

1. Some conditions may require the use of warm water and a mild detergent.
2. Clean the A/C condenser fins.
3. Clean between the A/C condenser and radiator.
4. Clean the radiator cooling fins.
5. Straighten any damaged cooling fins.

J 38185 Hose Clamp Pliers. See Special Tools .

Removal Procedure

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Disconnect the master cylinder fluid level sensor electrical connector and reposition aside.
3. Using the J 38185 , disengage and reposition the surge tank outlet hose clamp. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Disconnect the surge tank outlet hose.
5. Using the J 38185 , disengage and reposition the surge tank inlet hose clamp. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Disconnect the surge tank inlet hose.
7. Remove the surge tank bolt.
8. Remove the surge tank nut.
9. Disconnect the low coolant sensor electrical connector.
10. Remove the surge tank.

Installation Procedure

1. Install the surge tank.
2. Connect the low coolant sensor electrical connector.
3. Install the surge tank nut and tighten to 9 N.m (80 lb in).
4. Install the surge tank bolt and tighten to 9 N.m (80 lb in).
5. Connect the surge tank inlet hose to the surge tank.
6. Using the J 38185 , reposition the hose clamp to secure the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Connect the surge tank outlet hose.
8. Using the J 38185 , reposition the hose clamp to secure the surge tank outlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Connect the master cylinder fluid level sensor electrical connector.
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Using the J 38185 , disengage clamp tension and disconnect the overflow hose from the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage clamp tension and disconnect the outlet hose from the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the fill neck bolts.
4. Using the J 38185 disengage clamp tension and disconnect the overflow hose from the reservoir. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the overflow hose.

1. Install the overflow hose.
2. Using the J 38185 disengage clamp tension and connect the overflow hose onto the reservoir. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 disengage clamp tension and connect the outlet hose onto the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using the J 38185 , disengage clamp tension and connect the overflow hose onto the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the fill neck bolts and tighten to 9 N.m (80 lb in).
6. Inspect the level of the charge air cooling system and fill as necessary. Refer to «Charge Air Cooling System Coolant Level Inspection»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-coolant-level) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Using the J 38185 , disengage clamp tension and disconnect the overflow hose from the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage clamp tension and disconnect the outlet hose from the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the fill neck bolts.
4. Using the J 38185 disengage clamp tension and disconnect the overflow hose from the reservoir. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the overflow hose.

1. Install the overflow hose.
2. Using the J 38185 disengage clamp tension and connect the overflow hose onto the reservoir. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 disengage clamp tension and connect the outlet hose onto the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using the J 38185 , disengage clamp tension and connect the overflow hose onto the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the fill neck bolts and tighten to 9 N.m (80 lb in).
6. Inspect the level of the charge air cooling system and fill as necessary. Refer to «Charge Air Cooling System Coolant Level Inspection»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-coolant-level) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using J 38185 , disengage the hose clamp at the surge tank (1) and disconnect the surge tank inlet hose (2). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using J 38185 , disengage the hose clamp at the radiator and disconnect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using J 38185 , disengage the hose clamp at the throttle body assembly and disconnect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the surge tank inlet hose from the vehicle.

1. Using J 38185 , engage the hose clamp at the throttle body assembly and connect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using J 38185 , engage the hose clamp at the radiator and connect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Position the surge tank inlet hose to the retaining feature of the air cleaner assembly.
4. Using J 38185 , engage the hose clamp at the surge tank (1) and connect the surge tank inlet hose (2). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 2

J 38185 Hose Clamp Pliers. See Special Tools .

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using J 38185 , disengage the clamp at the surge tank and disconnect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using J 38185 , disengage the clamp at the radiator and disconnect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the surge tank inlet hose from the retaining features on the fan shroud and the air cleaner assembly.
5. Using J 38185 , disengage the clamp at the water housing assembly and disconnect the surge tank inlet hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the surge tank inlet hose from the vehicle.

1. Install the surge tank inlet hose.
2. Using J 38185 , install the surge tank inlet hose to the water housing assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Insert the surge tank inlet hose into the retaining features on the fan shroud and the air cleaner housing assembly.
4. Using J 38185 , install the surge tank inlet hose to the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Using J 38185 , install the surge tank inlet hose to the surge tank. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-2-of-6) .
3. Compress the clamp (1) and remove the surge tank outlet hose from the surge tank (2).
4. Separate the hose (2) from the retaining features (1 and 3) on the front of dash.
5. Compress the clamp (2) and remove the surge tank outlet hose from the heater hose (1).
6. Remove the surge tank outlet hose/pipe from the engine compartment.

1. Position the surge tank outlet hose/pipe to the engine compartment.
2. Compress the clamp (2) and connect the surge tank outlet hose to the heater hose (1).
3. Install the hose (2) to the retaining features (1 and 3) on the front of dash.
4. Compress the clamp (1) and connect the surge tank outlet hose to the surge tank (2).
5. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-2-of-6) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Position J 38185 to the clamp in order to remove the outlet hose (2) from the surge tank (1). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Loosen the bolt on the bracket which secures the surge tank outlet hose to the engine.
4. Position J 38185 to the clamp in order to remove the surge tank outlet hose from the thermostat assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the surge tank outlet hose/pipe from the engine.

1. Position the surge tank outlet hose/pipe to the engine.
2. Position J 38185 to the clamp in order to connect the surge tank outlet hose to the thermostat assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Install the bolt to the bracket securing the surge tank outlet pipe to the engine and tighten to 9 N.m (80 lb in).
4. Position J 38185 to the clamp in order to connect the outlet hose (2) to the surge tank (1). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage the tension on the hose clamp and remove the radiator inlet hose from the thermostat housing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage the tension on the hose clamp and remove the radiator inlet hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the radiator inlet hose from the vehicle.

1. Install the inlet radiator hose into the vehicle.
2. Using the J 38185 , disengage the tension on the hose clamp and Install the radiator inlet hose to the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 slide the clamp into the original position. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using the J 38185 , disengage the tension on the hose clamp and install the radiator inlet hose to the thermostat housing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Using the J 38185 slide the clamp into the original position. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 3

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp and remove the radiator inlet hose from the throttle body housing.
3. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp (1) and remove the radiator inlet hose (2) from the radiator.
4. Remove the radiator inlet hose from the vehicle.

1. Install the inlet radiator hose into the vehicle.
2. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp (1) and Install the radiator inlet hose () to the radiator.
3. Using the J 38185: Hose Clamp Pliers slide the clamp into the original position.
4. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp and install the radiator inlet hose to the throttle body housing.
5. Using the J 38185: Hose Clamp Pliers slide the clamp into the original position.
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp and remove the radiator inlet hose from the throttle body housing.
3. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp (1) and remove the radiator inlet hose (2) from the radiator.
4. Remove the radiator inlet hose from the vehicle.

1. Install the inlet radiator hose into the vehicle.
2. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp (1) and Install the radiator inlet hose () to the radiator.
3. Using the J 38185: Hose Clamp Pliers slide the clamp into the original position.
4. Using the J 38185: Hose Clamp Pliers, disengage the tension on the hose clamp and install the radiator inlet hose to the throttle body housing.
5. Using the J 38185: Hose Clamp Pliers slide the clamp into the original position.
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the radiator inlet hose. Refer to «Radiator Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With Out V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage the tension on the hose clamp and remove the radiator outlet hose from the thermostat housing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Disconnect the radiator outlet hose from the engine support bracket.
5. Remove the air cleaner intake duct. Refer to «Air Cleaner Inlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .
6. Using the J 38185 , disengage the tension on the hose clamp and remove the radiator outlet hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Remove the radiator outlet hose from the vehicle.

1. Install the radiator outlet hose to the vehicle.
2. Using the J 38185 , disengage the tension on the hose clamp and install the radiator outlet hose to the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 slide the clamp into the original position. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using the J 38185 , disengage the tension on the hose clamp and install the radiator outlet hose to the thermostat housing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Using the J 38185 slide the clamp into the original position. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the radiator outlet hose to the engine support bracket.
7. Install the radiator inlet hose. Refer to «Radiator Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With Out V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 4

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage clamp tension and disconnect the radiator inlet hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage clamp tension and disconnect the radiator inlet hose from the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the radiator inlet hose.

1. Install the radiator inlet hose.
2. Using the J 38185 , disengage clamp tension and connect the pump inlet hose onto the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage clamp tension and connect the radiator inlet hose onto the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using the J 38185 , disengage clamp tension and connect the radiator inlet hose onto the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage clamp tension and disconnect the radiator outlet hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage clamp tension and disconnect the radiator outlet hose from the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Lower the vehicle.
5. Using the J 38185 , disengage clamp tension and disconnect the radiator outlet hose from the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the radiator outlet hose.

1. Install the radiator outlet hose.
2. Using the J 38185 , disengage clamp tension and connect the radiator outlet hose onto the fill neck. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Raise the vehicle.
4. Using the J 38185 , disengage clamp tension and connect the radiator outlet hose onto the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Using the J 38185 , disengage clamp tension and connect the radiator outlet hose onto the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 5

Scheme 6

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Remove the left lower front bumper close out panel. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
3. Install oil drain pan under the vehicle.
4. Remove the engine oil cooler hose/pipe from the external oil cooler. Refer to «Engine Oil Cooler Hose/Pipe Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the external engine oil cooler quick connect fitting.
6. Remove and discard all engine oil cooler hose/pipe seals.

1. Install new engine oil cooler hose/pipe seals.
2. Install the external engine oil cooler quick connect fitting and tighten to 18 N.m (13 lb ft).
3. Install the engine oil cooler hose/pipes to the external oil cooler. Refer to «Engine Oil Cooler Hose/Pipe Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the oil drain pan from under the vehicle.
5. Install the left lower front bumper close out panel. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
6. Refill the engine with oil and check for leaks.

DT-47731 Transmission Cooler Quick Disconnect

1. Install the DT-47731 onto the engine oil cooler (EOC) pipe.
2. Slide the DT-47731 toward the EOC pipe fitting.
3. Connect the DT-47731 onto the EOC pipe fitting.
4. Rotate the DT-47731 until the retainer clip (1) rises above the fitting retainer seat.
5. Pull back on the EOC pipe to disengage the pipe from the EOC pipe fitting.
6. Remove the DT-47731 from the EOC pipe.

1. Install the EOC pipe into the EOC pipe fitting. A distinct snap should be heard or felt when assembling the EOC pipe to the fitting.
2. To ensure the cooler line is properly installed, give the cooler pipe a gentle pull.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Remove the Front Air Deflector Replacement. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
3. Install oil drain pan under the vehicle.
4. Remove the engine oil cooler hose/pipe from the external oil cooler. Refer to «Engine Oil Cooler Pipe/Hose Quick Connect Fitting Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Disconnect the engine oil cooler hose/pipe clip from the fan shroud.
6. Disconnect the engine oil cooler hose/pipe clip from the engine.
7. Remove the external engine oil cooler hose/pipe from the engine. Refer to «Engine Oil Cooler Pipe/Hose Quick Connect Fitting Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Remove the external engine oil cooler hose/pipe from the vehicle.
9. Remove and discard all engine oil cooler hose/pipe seals.

1. Install new engine oil cooler hose/pipe seals.
2. Install the external engine oil cooler hose/pipe to the vehicle.
3. Install the external engine oil cooler hose/pipe to the engine. Refer to «Engine Oil Cooler Pipe/Hose Quick Connect Fitting Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Connect the engine oil cooler hose/pipe clip to the engine.
5. Connect the engine oil cooler hose/pipe clip to the fan shroud.
6. Install the engine oil cooler hose/pipes to the external oil cooler. Refer to «Engine Oil Cooler Pipe/Hose Quick Connect Fitting Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Remove the oil drain pan from under the vehicle.
8. Install the Front Air Deflector Replacement. Refer to «Front Air Deflector Replacement»(/cadillac/sts/i-2007-2011/remont/exterior-body-panels/#bumpers-and-fascia) .
9. Refill the engine with oil and check for leaks.

Auxiliary Engine Oil Cooler Replacement

The engine oil cooler is the top part of a combined assembly for engine oil and transmission fluid cooling. For replacement refer to Engine Oil and Transmission Fluid Cooler Replacement .

J 41240 Fan Clutch Wrench. See Special Tools .

1. Remove the air cleaner intake duct. Refer to «Air Cleaner Inlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .
2. Loosen the fan nut from the crank adapter shaft using J 41240 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the fan from the vehicle.

1. Install the fan to the vehicle.
2. Tighten the fan nut to the crank adapter shaft using J 41240 to 100 N. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .m (74 lb ft).
3. Install the air cleaner intake duct. Refer to «Air Cleaner Inlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .

J 41240 Fan Clutch Remove and Installer. See Special Tools .

1. Remove the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
2. Loosen the fan nut from the crank adapter shaft using J 41240 . See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Shroud Replacement (LH2 With Out V92, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Continue to loosen the fan nut and disconnect the fan from the crank adapter shaft.
5. Remove the fan from the vehicle.

1. Install the fan to the vehicle.
2. Connect the fan to the crank adapter shaft.
3. Install the fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Shroud Replacement (LH2 With Out V92, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Tighten the fan nut to the crank adapter shaft using J 41240 to 100 N. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .m (74 lb ft).
5. Install the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .

1. Remove the cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Hold the cooling fan adapter from turning by placing a wrench on the adapter flat spots.
3. Remove the cooling fan adapter bolts.
4. Remove the cooling fan adapter from the vehicle.

1. Install the cooling fan adapter to the vehicle.
2. Hold the cooling fan adapter from turning by placing a wrench on the adapter flat spots.
3. Install the cooling fan adapter bolts and tighten to 24 N.m (18 lb ft).
4. Install the cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Inlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .
2. Disconnect the cooling fan electrical connectors.
3. Disconnect the condenser tube from the cooling fan shroud retainer clip.
4. Disengage the surge tank inlet hose from the retaining features on the cooling fan shroud and reposition aside.
5. Remove the retaining bolts that secure the cooling fan shroud to the radiator.
6. Remove the cooling fan assembly.

1. Install the cooling fan assembly.
2. Install the retaining bolts that secure the cooling fan shroud to the radiator and tighten to 5.4 N.m (48 lb in).
3. Engage the surge tank inlet hose to the retaining features on the cooling fan shroud.
4. Connect the condenser tube to the cooling fan shroud retainer clip.
5. Connect the cooling fan electrical connectors.
6. Install the air cleaner outlet duct. Refer to «Air Cleaner Inlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .

1. Remove the upper mounting bolts that secure the auxiliary cooling fan assembly to the condenser.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
3. Remove the front air deflector retainers.
4. Remove the front air deflector.
5. Disconnect the electrical connectors from the auxiliary cooling fan assembly.
6. Remove the lower mounting bolts that secure the auxiliary cooling fan assembly to the condenser.
7. Remove the auxiliary cooling fan assembly.

1. Install the auxiliary cooling fan assembly.
2. Install the mounting bolts that secure the auxiliary cooling fan assembly to the condenser and tighten to 5.4 N.m (48 lb in).
3. Connect the electrical connectors to the auxiliary cooling fan assembly.
4. Install the front air deflector.
5. Install the front air deflector retainers.
6. Lower the vehicle.
7. Install the upper mounting bolts that secure the auxiliary cooling fan assembly to the condenser and tighten to 5.4 N.m (48 lb in).

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
2. Disengage the surge tank inlet hose from the retaining features on the cooling fan shroud and reposition aside.
3. Remove the upper retaining bolts that secure the cooling fan shroud to the radiator.
4. Remove the LH lower retaining bolt that secures the cooling fan shroud to the radiator.
5. Disconnect the cooling fan electrical connectors.
6. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
7. Remove the front air deflector retainers.
8. Remove the front air deflector.
9. Remove the RH lower retaining bolt that secures the cooling fan shroud to the radiator.
10. Disconnect and reposition the engine wiring harness from the engine frame and reposition.
11. Remove the retaining bolts that secure the power steering line to the cooling fan shroud.
12. Remove the retaining bolts that secure the transmission oil cooler lines to the cooling fan shroud.
13. Lower the vehicle.
14. Remove the cooling fan assembly.

1. Install the cooling fan assembly.
2. Raise the vehicle.
3. Install the retaining bolts that secure the transmission oil cooler lines to the cooling fan shroud and tighten to 5.4 N.m (48 lb in).
4. Install the retaining bolts that secure the power steering lines to the cooling fan shroud and tighten to 5.4 N.m (48 lb in).
5. Connect the engine wiring harness to the engine frame.
6. Install the RH lower retaining bolt that secures the cooling fan shroud to the radiator and tighten to 5.4 N.m (48 lb in).
7. Install the front air deflector.
8. Install the front air deflector retainers.
9. Lower the vehicle.
10. Connect the cooling fan electrical connectors.
11. Install the upper retaining bolts that secure the cooling fan shroud to the radiator and tighten to 5.4 N.m (48 lb in).
12. Install the left side lower retaining bolt that secures the cooling fan shroud to the radiator and tighten to 5.4 N.m (48 lb in).
13. Engage the surge tank inlet hose to the retaining features on the cooling fan shroud.
14. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .

1. Remove the cooling fan assembly. Refer to «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the fan blade retaining nut (1) from the motor.
3. Remove the fan blade from the motor shaft.
4. Remove the motor retaining screws (1).
5. Remove the motor from the shroud.

1. Install the motor to the shroud.
2. Install the cooling fan motor retaining screws (1) and tighten to 5 N.m (44 lb in).
3. Install the fan blade to the motor shaft.
4. Rotate the fan until the fan drops onto the shaft.
5. Install the fan blade retaining nut (1) to the motor and tighten to 7 N.m (62 lb in).
6. Install the cooling fan assembly. Refer to «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the engine cooling fan. Refer to «Fan Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the fan bracket to crankshaft balancer bolts.
3. Remove the fan bracket to engine block bolts.
4. Remove the fan bracket from the vehicle.

1. Install the fan bracket to the engine.
2. Install but DO NOT tighten the fan bracket to engine block bolts.
3. If necessary, with the aid of an assistant, tap the engine ignition until the fan bracket to crankshaft balancer bolt holes are accessible.
4. Install the fan bracket to crankshaft balancer bolts. Tighten the fan bracket to crankshaft balancer bolts to 24 N.m (18 lb ft). Tighten the fan bracket to engine block bolts to 24 N.m (18 lb ft).
5. Install the engine cooling fan. Refer to «Fan Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 28410 Gasket Remover. See Special Tools .

1. Disconnect the heater hoses from the heater core. Refer to «Heater Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) and «Heater Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Remove the thermostat. Refer to «Engine Coolant Thermostat Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the thermostat housing bolts.
4. Remove the thermostat housing with the heater pipes, hoses and bolts.
5. Carefully clean the sealing surfaces with a plastic gasket scraper such as J 28410 or equivalent. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Assemble the heater pipes and hoses to the thermostat housing.
2. Install a new gasket to the thermostat housing.
3. Install the thermostat housing bolts to the thermostat housing. Partially install the thermostat housing bolts in order to retain the gasket.
4. Install the thermostat housing with the heater pipes, heater hoses, gasket and bolts.
5. Install the thermostat housing bolts and tighten to 20 N.m (15 lb ft).
6. Install the thermostat. Refer to «Engine Coolant Thermostat Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Connect the heater hoses to the heater core. Refer to «Heater Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) and «Heater Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

Scheme 7

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction) .
3. Remove the radiator hose from the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the heater hose from the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Heater Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the thermostat housing bolts (4).
6. Remove the thermostat housing (3) with thermostat (1), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the thermostat (1) to the thermostat housing (3).
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (3) with the thermostat (1) and the seal (2) to the water housing.
5. Install the thermostat housing bolts (4) and tighten to 10 N.m (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Heater Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Install the radiator hose to the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction) .
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
3. Remove the radiator hose from the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the heater hose from the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the thermostat housing bolts.
6. Remove the thermostat housing (1) with thermostat (3), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the thermostat to the thermostat housing.
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (1) with the thermostat (3) and the seal (2) to the water housing.
5. Install the thermostat housing bolts and tighten to 10 N.m (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Install the radiator hose to the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the upper intake manifold with the lower intake manifold. Refer to «Lower Intake Manifold Replacement (LP1, LY7)»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-2-of-6) .
3. Disconnect the surge tank hose from the thermostat.
4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (7).
6. Remove the coolant inlet pipe (4) from the thermostat.
7. Remove the thermostat bolts.
8. Remove the thermostat and discard the thermostat seal.

1. Install the thermostat with a NEW thermostat seal.
2. Install the thermostat bolts and tighten to 10 N.m (89 lb in).
3. Install the coolant pipe (4), NEW seal, and fasteners (2 and 7). Refer to «Engine Coolant Inlet Pipe Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Install the surge tank hose to the thermostat.
5. Install the upper intake manifold with the lower intake manifold. Refer to «Lower Intake Manifold Replacement (LP1, LY7)»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-2-of-6) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the upper intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-2-of-6) .
3. Disconnect the surge tank outlet pipe from the thermostat. Refer to «Radiator Surge Tank Outlet Hose/Pipe Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (7).
6. Remove the coolant inlet pipe (4) from the thermostat.
7. Remove the thermostat bolts (1).
8. Remove the thermostat (2) and discard the thermostat seal (3).

1. Install the thermostat (2) with a NEW thermostat seal (3).
2. Install the thermostat bolts (1) and tighten to 10 N.m (89 lb in).
3. Install the coolant pipe (4), NEW seal, and fasteners (2 and 7). Refer to «Engine Coolant Inlet Pipe Replacement»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Connect the surge tank outlet pipe to the thermostat. Refer to «Radiator Surge Tank Outlet Hose/Pipe Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the upper intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-2-of-6) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction) .
3. Remove the radiator hose from the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the heater hose from the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Heater Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the thermostat housing bolts (4).
6. Remove the thermostat housing (3) with thermostat (1), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the thermostat (1) to the thermostat housing (3).
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (3) with the thermostat (1) and the seal (2) to the water housing.
5. Install the thermostat housing bolts (4) and tighten to 10 N.m (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Heater Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Install the radiator hose to the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction) .
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
3. Remove the radiator hose from the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the heater hose from the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the thermostat housing bolts.
6. Remove the thermostat housing (1) with thermostat (3), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the new thermostat to the thermostat housing.
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (1) with the thermostat (3) and the seal (2) to the water housing.
5. Install the thermostat housing bolts and tighten to 10 N.m (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to «Heater Outlet Hose Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Install the radiator hose to the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. For the LLT engine, remove the throttle body. Refer to «Throttle Body Assembly Replacement (LP1, LY7)»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .
3. Remove the radiator hose from the water outlet. Refer to «Radiator Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the water outlet housing bolts.
5. Remove the water outlet.
6. Remove and discard the water outlet seals.
7. Clean the water outlet housing sealing surfaces.

1. Install NEW water outlet housing seals.
2. Install the water outlet.
3. Install the water outlet bolts and tighten to 10 N.m(89 lb in)..
4. Install the radiator hose to the water outlet. Refer to «Radiator Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. For the LLT engine, install the throttle body. Refer to «Throttle Body Assembly Replacement (LP1, LY7)»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-36l-introduction) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the engine cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the supercharger assembly. Refer to «Supercharger Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
4. Remove the supercharger belt tensioner. Refer to «Supercharger Belt Tensioner Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
5. Remove the inboard supercharger idler pulley. Refer to «Belt Idler Pulley Replacement - Supercharger»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
6. Remove the two coolant hoses from the water outlet housing. Refer to «Radiator Surge Tank Inlet Hose/Pipe Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Inlet Hose/Pipe Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Inlet Hose/Pipe Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Remove the radiator hose from the water outlet housing. Refer to «Radiator Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With Out V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Reposition the lower clamp on the bypass hose.
9. Remove the bolts securing the water outlet housing to the cylinder heads.
10. Remove the water outlet housing along with the bypass hose from the engine.
11. Discard the water outlet housing gaskets.
12. Disassemble the water outlet housing if necessary. Refer to «Water Outlet Housing Disassemble»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-4-of-6__water-outlet-housing-disassemble)
13. Clean and inspect the water outlet housing. Refer to «Water Outlet Housing Cleaning and Inspection»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-4-of-6) .

1. Assemble the water outlet housing if necessary. Refer to «Water Outlet Housing Assemble»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-4-of-6__water-outlet-housing-assemble) .
2. Install NEW water outlet housing gaskets.
3. Install the water outlet housing with bypass hose to the vehicle.
4. Install the water outlet housing bolts and tighten to 25 N.m (18 lb ft).
5. Install the bypass hose clamp in the proper position.
6. Install the radiator hose to the water outlet housing. Refer to «Radiator Inlet Hose Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Inlet Hose Replacement (LH2 With Out V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Install the two coolant hoses to the water outlet housing. Refer to «Radiator Surge Tank Inlet Hose/Pipe Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Inlet Hose/Pipe Replacement (LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Inlet Hose/Pipe Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the supercharger idler pulley. Refer to «Belt Idler Pulley Replacement - Supercharger»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
9. Install the supercharger belt tensioner. Refer to «Supercharger Belt Tensioner Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
10. Install the supercharger assembly. Refer to «Supercharger Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
11. Fill the charge air cooling system with coolant. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
12. Fill the engine cooling system with coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
13. Check the engine cooling system for leaks.
14. Check the charge air cooling system for leaks.

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the throttle body. Refer to «Throttle Body Assembly Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
3. Remove the manifold absolute pressure (MAP) sensor (3). Refer to «Manifold Absolute Pressure Sensor Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
4. Disconnect the evaporative emission (EVAP) canister purge solenoid valve hose and electrical connector. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
5. Compress the clamps and remove the following hoses from the thermostat and the water housing: The heater inlet hose (1) The radiator inlet hose (2) The heater outlet hose (3) The bypass hose (4) The surge tank inlet hose
6. Loosen the intake manifold duct clamp (1).
7. Remove the bolts (1, 2) securing the water outlet housing to the cylinder heads.
8. Remove the water outlet housing from the vehicle.
9. Discard the water outlet housing gaskets.
10. Clean and inspect the water outlet housing. Refer to «Water Outlet Housing Cleaning and Inspection»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-5-of-6) .
11. Remove the following components from the water outlet housing if replacement is necessary: The intake manifold inlet duct and clamp The surge tank inlet hose fitting The heater inlet hose fitting The evaporative emission (EVAP) canister purge solenoid valve-Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .

1. Install the following components to the water outlet housing if previously removed: The intake manifold inlet duct and clamp and tighten to 6 N.m (53 lb in). The surge tank inlet hose fitting and tighten to 18 N.m (13 lb ft). The heater inlet hose fitting and tighten to 20 N.m (15 lb ft). The (EVAP) canister purge solenoid valve and tighten to 12 N.m (106 lb in).
2. Install NEW water outlet housing gaskets.
3. Install the water outlet housing to the vehicle.
4. Install the water outlet housing bolts and tighten to 25 N.m (18 lb ft).
5. Install the intake manifold duct clamp (1) and tighten to 6 N.m (53 lb in).
6. Compress the clamps and install the following hoses to the thermostat and the water housing: The heater inlet hose (1) The radiator inlet hose (2) The heater outlet hose (3) The bypass hose (4) The surge tank inlet hose
7. Connect the evaporative emission (EVAP) canister purge solenoid valve hose and electrical connector. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
8. Install the manifold absolute pressure (MAP) sensor (3). Refer to «Manifold Absolute Pressure Sensor Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
9. Install the throttle body. Refer to «Throttle Body Assembly Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the water outlet housing. Refer to «Water Outlet Housing Replacement (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Compress the clamp, and remove the bypass hose from the water outlet housing.

1. Compress the clamp and install the bypass hose to the water outlet housing.
2. Install the water outlet housing. Refer to «Water Outlet Housing Replacement (LC3)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Check the cooling system for leaks.

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
3. Compress the clamp, and remove the heater outlet hose (3) from the thermostat housing in order to gain access to the bypass hose.
4. Compress the clamps (1, 3) and remove the bypass hose (2) from the water outlet housing and the front cover.

1. Compress the clamps (1, 3) and install the bypass hose (2) to the water outlet housing and the front cover.
2. Compress the clamp, and install the heater outlet hose (3) to the thermostat housing.
3. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-46l-introduction) .
4. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Check the cooling system for leaks.

EN 46104 Water Pump Pulley Holding Tool. See Special Tools .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the generator drive belt. Refer to «Water Pump and Generator Belt Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-2-of-6) .
3. Use the EN 46104 (1) in order to retain the water pump pulley. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the water pump pulley bolts.
5. Remove the water pump pulley.
6. Remove the water pump bolts.
7. Remove the water pump.
8. Remove and DISCARD the water pump seal.
9. Carefully clean the water pump sealing surfaces.

1. Install a NEW water pump seal.
2. Install the water pump.
3. Install the water pump bolts and tighten to 10 N.m (89 lb in).
4. Install the water pump pulley and the water pump pulley bolts.
5. Use the EN 46104 (1) in order to retain the water pump pulley. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the water pump pulley bolts and tighten to 12 N.m (106 lb in).
7. Install the generator drive belt. Refer to «Water Pump and Generator Belt Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-36l-2-of-6) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the cooling fan. Refer to «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the air conditioning, power steering and water pump drive belt. Refer to «Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
4. Remove the air conditioning, power steering and water pump drive belt tensioner. Refer to «Drive Belt Tensioner Replacement - Air Conditioning, Power Steering, and Water Pump»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
5. Remove the water pump pulley bolts.
6. Remove the water pump pulley from the water pump.
7. Remove the water pump bolts.
8. Remove the water pump and seal. Do not reuse the seal.
9. Clean the water pump mating surfaces.
10. Clean and inspect the water pump. Refer to «Water Pump Cleaning and Inspection»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-4-of-6__water-pump-cleaning-and-inspection) .

1. Install the water pump and NEW seal to the engine front cover.
2. Install the water pump bolts and tighten to 10 N.m (89 lb in).
3. Install the water pump pulley to the water pump.
4. Install the water pump pulley bolts and tighten to 12 N.m (106 lb in).
5. Install the air conditioning, power steering and water pump drive belt tensioner. Refer to «Drive Belt Tensioner Replacement - Air Conditioning, Power Steering, and Water Pump»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
6. Install the air conditioning, power steering and water pump drive belt. Refer to «Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-2-of-6) .
7. Install the cooling fan. Refer to «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the water pump drive belt. Refer to «Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-2-of-6) .
4. Remove the drive belt tensioner. Refer to «Drive Belt Tensioner Replacement - Air Conditioning, Power Steering, and Water Pump»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-2-of-6) .
5. Remove the water pump pulley bolts.
6. Remove the water pump pulley from the water pump.
7. Remove the water pump bolts.
8. Remove the water pump and seal. Do not reuse the seal.
9. Clean the water pump mating surfaces.
10. Clean and inspect the water pump. Refer to «Water Pump Cleaning and Inspection»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-44l-4-of-6__water-pump-cleaning-and-inspection) .

1. Install the water pump and NEW seal to the engine front cover.
2. Install the water pump bolts and tighten to 10 N.m (89 lb in).
3. Install the water pump pulley to the water pump.
4. Install the water pump pulley bolts and tighten to 12 N.m (106 lb in).
5. Install the drive belt tensioner. Refer to «Drive Belt Tensioner Replacement - Air Conditioning, Power Steering, and Water Pump»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-2-of-6) .
6. Install the water pump drive belt. Refer to «Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement»(/cadillac/sts/i-2007-2011/remont/mechanical/#engine-mechanical-46l-2-of-6) .
7. Install the cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 slide the hose clamp down on the hose (3). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Disconnect the hose from the auxiliary water pump.
4. Using the J 38185 slide the hose clamp back on the hose (1). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Disconnect the hose from the auxiliary water pump.
6. Disconnect the auxiliary water pump electrical connector.
7. Remove the auxiliary water pump nuts.
8. Remove the auxiliary water pump.

1. Install the auxiliary water pump.
2. Install the auxiliary water pump nuts and tighten to 9 N.m (80 lb in).
3. Connect the auxiliary water pump electrical connector.
4. Connect the hose (3) to the auxiliary water pump.
5. Using the J 38185 slide the hose clamp back into the original position on the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Connect the hose (1) to the auxiliary water pump.
7. Using the J 38185 slide the hose clamp back to the original position on the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Fill the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 8

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction) .
3. Using the J 38185 , disengage clamp tension and disconnect the supercharger inlet and outlet hoses at the supercharger. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the pipe assembly to fan shroud mounting bolts.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
6. Using the J 38185 , disengage clamp tension and disconnect the pump outlet hose from the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Using the J 38185 , disengage clamp tension and disconnect the radiator inlet hose from the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Remove the pipe assembly mounting bolt at the condenser bracket.
9. Remove the pipe assembly.

1. Install the pipe assembly.
2. Install the pipe assembly mounting bolt to the condenser bracket and tighten to 5.4 N.m (80 lb in).
3. Using the J 38185 , disengage clamp tension and connect the radiator inlet hose onto the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Using the J 38185 , disengage clamp tension and connect the pump outlet hose onto the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Lower the vehicle.
6. Install the pipe assembly to the fan shroud mounting bolts and tighten to 5.4 N.m (80 lb in).
7. Using the J 38185 , disengage clamp tension and connect the supercharger inlet and outlet hoses onto the supercharger. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2007-2011/remont/testing-diagnostics/#engine-controls-and-fuel-44l-introduction) .
9. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage clamp tension and disconnect the pump outlet hose from the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage clamp tension and disconnect the pump inlet hose from the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Disconnect and reposition the pump electrical connector.
5. Remove the pump mounting nuts.
6. Open the pump retaining clamps.
7. Remove the pump.

1. Install the pump.
2. Close the pump retaining clamps.
3. Install the pump mounting nuts and tighten to 16 N.m (12 lb ft).
4. Connect the pump electrical connector.
5. Using the J 38185 , disengage clamp tension and connect the pump inlet hose onto the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Using the J 38185 , disengage clamp tension and connect the pump outlet hose onto the pump. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the fan. Refer to «Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Disconnect the condenser tube from the fan shroud retainer clip.
3. Remove the cooling fan shroud retaining bolts.
4. Remove the cooling fan shroud.

1. Install the cooling fan shroud.
2. Install the cooling fan shroud retaining bolts and tighten to 5.4 N.m (48 lb in).
3. Connect the condenser tube to the fan shroud retainer clip.
4. Install the fan. Refer to «Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the fan. Refer to «Fan Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Lower the vehicle.
3. Disconnect the condenser tube from the fan shroud retainer clip.
4. Remove the cooling fan shroud retaining bolts.
5. Remove the cooling fan shroud.

1. Install the cooling fan shroud.
2. Install the cooling fan shroud retaining bolts and tighten to 5.4 N.m (48 lb in).
3. Connect the condenser tube to the fan shroud retainer clip.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
5. Install the fan. Refer to «Fan Replacement (LH2)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 9

1. J 38185 Hose Clamp Pliers. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 38778 Door Trim Pad Clip Remover. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the electric cooling fan assembly. Refer to «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Remove the lower condenser mounting bolts.
5. Remove the upper condenser mounting bolts.
6. Remove the transmission oil cooler mounting bolts.
7. Disconnect the lower retainer pins of the side air baffle from the radiator.
8. Lower the vehicle.
9. Remove the radiator support bracket bolts.
10. Remove the radiator support brackets.
11. Use J 38778 to remove the radiator/condenser upper support. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
12. Use J 38185 to disconnect the surge tank inlet hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Reposition the hose aside.
13. Using J 38185 disengage tension on the radiator inlet hose clamp and disconnect the hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
14. Using J 38185 disengage tension on the radiator outlet hose clamp and disconnect the hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
15. Disconnect the upper retainer pins on the side air baffle from the radiator.
16. Remove the radiator.

1. Install the radiator.
2. Connect the upper retainer pins of the side air baffle to the radiator.
3. Connect the radiator outlet hose to the radiator. Use J 38185 to position the radiator outlet hose clamp to secure the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Connect the radiator inlet hose to the radiator. Use J 38185 to position the radiator inlet hose clamp to secure the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Connect the surge tank inlet hose to the radiator. Use J 38185 to position the hose clamp to secure the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the radiator/condenser upper support.
7. Install the radiator support brackets.
8. Install the radiator support bracket bolts and tighten to 9 N.m (80 lb in).
9. Raise and support the vehicle.
10. Connect the lower retainer pins of the side air baffle to the radiator.
11. Install the transmission oil cooler mounting bolts and tighten to 5 N.m (44 lb in).
12. Install the upper condenser mounting bolts and tighten to 5.4 N.m (48 lb in).
13. Install the lower condenser mounting bolts and tighten to 5.4 N.m (48 lb in).
14. Lower the vehicle.
15. Install the electric cooling fan assembly. Refer to «Engine Coolant Fan Replacement (LY7)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
16. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the electric cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the upper condenser mounting bolts.
4. Remove the lower condenser mounting bolts.
5. Disconnect the lower retaining pins of the side air baffle from the radiator.
6. Remove the transmission oil cooler (TOC) mounting bolts.
7. Lower the vehicle.
8. Remove the fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Shroud Replacement (LH2 With Out V92, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Use J 38185 to disengage the tension on the hose clamp. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Remove the radiator outlet hose from the radiator.
10. Use J 38185 to disengage the tension on the hose clamp. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Remove the radiator inlet hose from the radiator.
11. Use J 38185 to disengage the tension on the hose clamp. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) . Remove the surge tank inlet hose from the radiator.
12. Remove the radiator support bracket bolts.
13. Remove the radiator support brackets.
14. Disconnect the upper air baffle retaining pins from the radiator.
15. Remove the radiator.

1. Install the radiator.
2. Connect the upper air baffle retaining pins to the radiator.
3. Install the radiator support brackets.
4. Install the radiator support bracket bolts and tighten to 9 N.m (80 lb in).
5. Connect the surge tank inlet hose to the radiator. Use J 38185 to position the surge tank inlet hose clamp to secure the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Connect the radiator inlet hose to the radiator. Use J 38185 to position the radiator inlet hose clamp to secure the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Connect the radiator outlet hose to the radiator. Use J 38185 to position the radiator outlet hose clamp to secure the hose. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LH2 With V92)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Shroud Replacement (LH2 With Out V92, LLT)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Raise and support the vehicle.
10. Install the TOC mounting bolts and tighten to 5 N.m (44 lb in).
11. Connect the lower retaining pins of the side air baffle to the radiator.
12. Install the lower condenser mounting bolts and tighten to 5.4 N.m (48 lb in).
13. Install the upper condenser mounting bolts and tighten to 5.4 N.m (48 lb in).
14. Install the electric cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
15. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the electric cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the upper condenser mounting bolts (1).
4. Remove the lower condenser mounting bolts (1).
5. Disconnect the lower retaining pins of the side air baffle from the radiator.
6. Remove the transmission oil cooler (TOC) mounting bolts (1).
7. Lower the vehicle.
8. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the radiator outlet hose (2) from the radiator.
9. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the radiator inlet hose (2) from the radiator.
10. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the surge tank inlet hose (2) from the radiator.
11. Remove the radiator support bracket bolts (1).
12. Remove the radiator support brackets (2).
13. Disconnect the upper air baffle retaining pins from the radiator.
14. Remove the radiator.

1. Install the radiator.
2. Connect the upper air baffle retaining pins to the radiator.
3. Install the radiator support brackets (2).
4. Install the radiator support bracket bolts (1) and tighten to 9 N.m (80 lb in).
5. Connect the surge tank inlet hose (2) to the radiator. Use J 38185: Hose Clamp Pliers to position the surge tank inlet hose clamp (1) to secure the hose.
6. Connect the radiator inlet hose (2) to the radiator. Use J 38185: Hose Clamp Pliers to position the radiator inlet hose clamp (1) to secure the hose.
7. Connect the radiator outlet hose (2) to the radiator. Use J 38185: Hose Clamp Pliers to position the radiator outlet hose clamp (1) to secure the hose.
8. Raise and support the vehicle.
9. Install the TOC mounting bolts (1) and tighten to 5 N.m (44 lb in).
10. Connect the lower retaining pins of the side air baffle to the radiator.
11. Install the lower condenser mounting bolts (1) and tighten to 5.4 N.m (48 lb in).
12. Install the upper condenser mounting bolts (1) and tighten to 5.4 N.m (48 lb in).
13. Install the electric cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
14. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the electric cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the upper condenser mounting bolts (1).
4. Remove the lower condenser mounting bolts (1).
5. Disconnect the lower retaining pins of the side air baffle from the radiator.
6. Remove the transmission oil cooler (TOC) mounting bolts (1).
7. Lower the vehicle.
8. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the radiator outlet hose (2) from the radiator.
9. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the radiator inlet hose (2) from the radiator.
10. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the surge tank inlet hose (2) from the radiator.
11. Use J 38185: Hose Clamp Pliers to disengage the tension on the hose clamp (1). Remove the auxiliary water pump outlet hose (2) from the radiator.
12. Remove the radiator support bracket bolts (1).
13. Remove the radiator support brackets (2).
14. Disconnect the upper air baffle retaining pins from the radiator.
15. Remove the radiator.

1. Install the radiator.
2. Connect the upper air baffle retaining pins to the radiator.
3. Install the radiator support brackets (2).
4. Install the radiator support bracket bolts (1) and tighten to 9 N.m (80 lb in).
5. Connect the auxiliary water pump outlet hose to the radiator (2). Use J 38185: Hose Clamp Pliers to position the auxiliary water pump outlet hose clamp (1) to secure the hose.
6. Connect the surge tank inlet hose (2) to the radiator. Use J 38185: Hose Clamp Pliers to position the surge tank inlet hose clamp (1) to secure the hose.
7. Connect the radiator inlet hose (2) to the radiator. Use J 38185: Hose Clamp Pliers to position the radiator inlet hose clamp (1) to secure the hose.
8. Connect the radiator outlet hose (2) to the radiator. Use J 38185: Hose Clamp Pliers to position the radiator outlet hose clamp (1) to secure the hose.
9. Raise and support the vehicle.
10. Install the TOC mounting bolts (1) and tighten to 5 N.m (44 lb in).
11. Connect the lower retaining pins of the side air baffle to the radiator.
12. Install the lower condenser mounting bolts (1) and tighten to 5.4 N.m (48 lb in).
13. Install the upper condenser mounting bolts (1) and tighten to 5.4 N.m (48 lb in).
14. Install the electric cooling fan. Refer to «Engine Coolant Fan Replacement (LH2 Heavy Duty Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LH2 Standard Cooling)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
15. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Using the J 38185 , disengage clamp tension and disconnect the radiator inlet hose from the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Using the J 38185 , disengage clamp tension and disconnect the radiator inlet hose from the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the radiator inlet hose.
5. Using the J 38185 , disengage clamp tension and disconnect the radiator outlet hose from the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the radiator mounting bolts.
7. Remove the radiator.

1. Install the radiator.
2. Install the radiator mounting bolts and tighten to 5.4 N.m (48 lb in).
3. Using the J 38185 , disengage clamp tension and connect the radiator outlet hose onto the radiator. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Install the radiator inlet hose.
5. Using the J 38185 , disengage clamp tension and connect the radiator inlet hose onto the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Using the J 38185 , disengage clamp tension and connect the radiator inlet hose onto the pipe assembly. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) or «Charge Air Cooling System Draining and Filling (Vac N Fill)»(/cadillac/sts/i-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Turn the ignition OFF.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
3. Disconnect the coolant heater cord from the coolant heater.
4. Remove the coolant heater.

1. Install the coolant heater.
2. Connect the coolant heater cord to the coolant heater.
3. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Disconnect the coolant heater power supply cord from the coolant heater.
3. Complete the following in order to remove the coolant heater from the engine block: Pry outward on the retaining clip. Pull the coolant heater from the engine block.

1. Install the coolant heater into the engine block until the retaining clip is fully engaged.
2. Connect the coolant heater power cord to the coolant heater.
3. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Disconnect the coolant heater power supply cord from the coolant heater.
3. Complete the following in order to remove the coolant heater from the engine block: Pry outward on the retaining clip. Pull the coolant heater from the engine block.

1. Install the coolant heater into the engine block until the retaining clip is fully engaged.
2. Connect the coolant heater power cord to the coolant heater.
3. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Disconnect the coolant heater power supply cord from the coolant heater.
3. Complete the following in order to remove the coolant heater from the engine block: Pry outward on the retaining clip. Pull the coolant heater from the engine block.

1. Install the coolant heater into the engine block until the retaining clip is fully engaged.
2. Connect the coolant heater power cord to the coolant heater.
3. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Disconnect the coolant heater power supply cord from the coolant heater (1).
3. Disconnect the coolant heater cord clip (2) from the coolant heater cord.
4. Lower the vehicle.
5. Disconnect the coolant heater cord clips (3, 4) from the following: The engine wiring harness conduit The engine oil level indicator tube
6. Remove the coolant heater cord from the vehicle.

1. Position the coolant heater power supply cord to the engine.
2. Route the coolant heater cord along the engine wiring harness conduit.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Connect the coolant heater cord to the coolant heater (1).
5. Secure the coolant heater cord clip (2) to the coolant heater cord.
6. Lower the vehicle.
7. Secure the coolant heater cord clips (3, 4) to the following: The engine wiring harness conduit The engine oil level indicator tube

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Disconnect the coolant heater power supply cord from the coolant heater.
3. Lower the vehicle.
4. Disconnect the coolant heater cord clips from the following: The engine wiring harness conduit The engine oil level indicator tube
5. Remove the coolant heater cord from the vehicle.

1. Position the coolant heater power supply cord to the engine.
2. Route the coolant heater cord along the engine wiring harness conduit.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Connect the coolant heater cord to the coolant heater.
5. Secure the coolant heater cord clip to the coolant heater cord.
6. Lower the vehicle.
7. Secure the coolant heater cord clips to the following: The engine wiring harness conduit The engine oil level indicator tube

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
2. Disconnect the coolant heater power supply cord from the coolant heater.
3. Lower the vehicle.
4. Disconnect the coolant heater cord clips from the following: The engine wiring harness conduit The engine oil level indicator tube
5. Remove the coolant heater cord from the vehicle.

1. Position the coolant heater power supply cord to the engine.
2. Route the coolant heater cord along the engine wiring harness conduit.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
4. Connect the coolant heater cord to the coolant heater.
5. Secure the coolant heater cord clip to the coolant heater cord.
6. Lower the vehicle.
7. Secure the coolant heater cord clips to the following: The engine wiring harness conduit The engine oil level indicator tube

Scheme 10

Scheme 11

The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans receive positive voltage from the cooling fan relays which receive battery positive voltage from the underhood fuse block.

During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the FAN 1 fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the S/P fan relay and the right cooling fan. The result is a series circuit with both fans running at low speed.

During high speed operation the ECM continues to supply battery positive voltage for the left cooling fan by grounding the coil of the low speed cooling fan relay. The ECM also grounds the high speed fan relay and the S/P fan relay through the high speed cooling fan relay control circuit. This energizes the S/P fan relay coil, closes the relay contacts, and provides a direct ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and providing battery positive voltage from the FAN 2 fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.

Cooling Fan Control - Two Fan System

The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.

During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.

During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.

The ECM commands the low speed cooling fans ON under the following conditions

1. Engine coolant temperature exceeds approximately 94.5°C (202°F).
2. A/C refrigerant pressure exceeds 1447 kPa (210 psi).
3. After the vehicle is shut OFF, if the engine coolant temperature at key-off is greater than 101°C (214°F), the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F), the fans will shut OFF. The fans will automatically shut OFF after 3 minutes, regardless of coolant temperature.

The ECM commands the high speed fans ON under the following conditions

1. Engine coolant temperature exceeds approximately 104.25°C (220°F).
2. A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
3. When certain DTCs set

At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed, if required. This ensures idle stability by preventing the fans from cycling between high and low speed.

Cooling Fan Control - Three Fan System

The engine cooling fan system consists of a mechanical fan, 2 electrical pusher-type cooling fans, and 3 fan relays. The low speed, high speed, and series parallel (S/P) relays are arranged in an S/P configuration that allows the engine control module (ECM) to operate the left cooling fan and right cooling fan together, at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.

During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit, to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.

During high speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.

The ECM commands the low speed fans ON under the following conditions

1. Engine coolant temperature exceeds approximately 94.5°C (202°F).
2. A/C refrigerant pressure exceeds 1447 kPa (210 psi).
3. After the vehicle is shut OFF, if the engine coolant temperature at key-off is greater than 101°C (214°F), the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F), the fans will shut OFF. The fans will automatically shut OFF after 4 minutes, regardless of coolant temperature.

The ECM commands the high speed fans ON under the following conditions

1. Engine coolant temperature exceeds approximately 104.25°C (220°F).
2. A/C refrigerant pressure exceeds 1824 kPa (265 psi).
3. When certain DTCs set

At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed, if required. This ensures idle stability by preventing the fans from cycling between high and low speed.

Engine Coolant

Engine coolant is the key element of the heating system. The engine thermostat controls the normal engine operating coolant temperature. Coolant pumped out of the engine block enters the heater core through the inlet heater hose. The air flowing through the HVAC module absorbs the heat of the coolant flowing through the heater core. The coolant then exits the heater core through the heater outlet hose. To prevent the coolant from boiling after the engine is turned OFF an after-boil/heater coolant pump is used.

The HVAC control module will command the after-boil/heater coolant pump ON, when the engine is OFF, under the following conditions

1. The engine is OFF.
2. The engine coolant temperature is above 101°C (214°F).

The above coolant flow circuits are designed to show the coolant flow related to the coolant by-pass valve positions only. The thermostat function and thermostat coolant flow paths are not shown.

Coolant Warning Messages

The radio will display the following messages if the following conditions exist in the cooling system.

1. Engine hot-A/C OFF will be displayed if coolant temperature is above 117°C (243°F). For imports 115°C (239°F).
2. Engine coolant hot-Idle engine will be displayed if coolant temperature is above 118°C (245°F).
3. Engine overheated-Stop engine will be displayed if coolant temperature is above 123°C (253°F).

Coolant Level Control

The engine cooling system contains an engine coolant level switch to alert the driver in the event of a low coolant level. When the engine coolant level in the surge tank falls below a certain level, the coolant level switch opens. When the HVAC control module detects an open, or a high voltage level on the coolant level indicator control circuit for at least 10 seconds, it will send a class 2 message to the radio requesting display of the low coolant level message. There is approximately a 10 second delay before the HVAC control module sends a class 2 message, to prevent the message from being displayed due to coolant sloshing in the surge tank.

Coolant Heater

The optional engine coolant heater (RPO K05) operates using 110-volt AC external power and is designed to warm the coolant in the engine block area for improved starting in very cold weather 29°C (20°F). The coolant heater helps reduce fuel consumption when a cold engine is warming up. The unit is equipped with a detachable AC power cord. A weather shield on the cord is provided to protect the plug when not in use.

The cooling system maintains an efficient engine operating temperature during all engine speeds and operating conditions. The cooling system removes approximately one-third of the heat produced by the burning of the air-fuel mixture. When the engine is cold, the system cools slowly or not at all, allowing the engine to warm quickly.

Cooling Cycle

The thermostat is located between the radiator outlet and the water pump inlet. At normal operating temperature, coolant is drawn from the radiator outlet and into the water pump inlet by the water pump. In cold conditions, the thermostat bypasses the radiator, and the pump draws coolant directly from the engine outlet.

Coolant is then pumped through the water pump outlet and into the engine block. In the engine block, the coolant circulates through the water jackets surrounding the cylinders and absorbs heat.

The coolant is then forced through the cylinder head gasket openings and into the cylinder heads. In the cylinder heads, the coolant flows through the water jackets surrounding the combustion chambers and valve seats, absorbing additional heat.

Coolant is also directed to the throttle body. There the coolant circulates through passages in the casting. During initial start up, the coolant assists in warming the throttle body. During normal operating temperatures, the coolant assists in keeping the throttle body cool.

From the cylinder heads, the coolant is then forced to the engine outlet. Coolant leaves the engine through 4 different routes

1. Through the engine outlet fitting to the radiator. This path is blocked at cold conditions by the thermostat at the engine inlet fitting.
2. Through the radiator bypass
3. To the heater core for passenger compartment heat and defrost
4. Through the vent hose to the surge tank, providing continuous de-aeration of the cooling system

Operation of the cooling system requires proper functioning of all cooling system components. The cooling system consists of the following components

Coolant

The engine coolant is a solution made up of a 50-50 mixture of DEX-COOL and clean drinkable water. The coolant solution carries excess heat away from the engine to the radiator, where the heat is dissipated to the atmosphere.

Radiator

The radiator is a heat exchanger, consisting of a core and 2 tanks. The aluminum core is a crossflow tube and fin design. This is a brazed tube with convoluted louvered fin design. Separate tubes and fins are stacked together with a manifold at each end. The entire core assembly is then brazed, forming a homogeneous unified structure. The fins allow for efficient heat transfer from the coolant to the atmosphere. The inlet and outlet tanks are molded with a high temperature, glass reinforced nylon plastic. The tank and gasket is supplied as an assembly with silicone gasket attached to the tank. The tanks are clamped to the core with clinch tabs. The tabs are part of the aluminum header at each end of the core. The radiator also has a drain cock which is located in the bottom of the passenger side tank. The drain cock includes the drain cock and drain cock seal.

The radiator removes heat from the coolant passing through the radiator. The fins on the core absorb heat from the coolant passing through the tubes. Air passing between the fins absorbs heat and cools the coolant.

During vehicle use, the coolant heats and expands. The coolant that is displaced by this expansion flows into the surge tank. As the coolant circulates, air is allowed to exit. Coolant without bubbles absorbs heat much better than coolant with bubbles.

Pressure Cap

The pressure cap seals and pressurizes the cooling system. The cap contains a blow off or pressure valve and a vacuum or atmospheric valve. The pressure valve is held against the valve seat by a spring which protects the radiator by relieving pressure exceeding 15 psi. The vacuum valve is held against the valve seat by a spring which permits opening of the valve to relieve vacuum created in the cooling system during cooling. The vacuum, if not relieved, could cause the radiator hoses to collapse.

The pressure cap allows pressure in the cooling system to build up. As the pressure builds, the boiling point of the coolant rises as well. Therefore, the coolant can be safely run at a temperature higher than the boiling point of the coolant at atmospheric pressure. The hotter the coolant is, the faster the heat moves from the radiator to the cooler, passing air. However, if the pressure exceeds the strength of the spring, the pressure valve rises so that the excess pressure can escape. When the engine cools down, the temperature of the coolant drops and a vacuum is created in the cooling system. This vacuum causes the vacuum valve to open, allowing outside air into the cooling system. This equalizes the pressure in the cooling system with atmospheric pressure, thus preventing the radiator hoses from collapsing.

Surge Tank

The surge tank is a plastic tank with a mounted pressure cap. The tank is mounted at a point higher than all other coolant passages. The surge tank provides an air space in the cooling system. The air space allows the coolant to expand and contract. The surge tank also provides a coolant fill point and a central air bleed location.

During vehicle use, the coolant heats and expands. The coolant that is displaced by this expansion flows into the surge tank. As the coolant circulates, air is allowed to exit. This is an advantage to the cooling system, because coolant without bubbles absorbs heat much better than coolant with bubbles.

Air Baffles and Seals

The cooling system uses deflectors, air baffles, and air seals to increase system cooling. Deflectors are installed under the vehicle which redirect airflow beneath the vehicle to flow through the radiator and increase cooling. Air baffles are also used to direct airflow into the radiator and increase cooling. Air seals prevent air from bypassing the radiator and A/C condenser. Air seals also prevent recirculation of the air for better hot weather cooling and A/C condenser performance.

Water Pump

The water pump is a centrifugal vane impeller type pump. The pump consists of a housing and an impeller. The impeller is a flat plate mounted on the pump shaft with a series of flat or curved blades or vanes. When the impeller rotates, the coolant between the vanes is thrown outward by centrifugal force. The impeller shaft is supported by one or more sealed bearings. The sealed bearings never need to be lubricated. Grease cannot leak out, dirt and water cannot get in as long as the seal is not damaged or worn.

The purpose of the water pump is to circulate coolant throughout the cooling system. The water pump is driven by the crankshaft via the drive belt.

Thermostat

The thermostat is a coolant flow control component. Its purpose is to regulate the operating temperature of the engine. It utilizes a temperature sensitive wax-pellet element. The element connects to a valve through a piston. When the element is heated, it expands and exerts pressure against a rubber diaphragm. This pressure forces the valve to open. As the element is cooled, it contracts. This contraction allows a spring to push the valve closed.

When the coolant temperature is below the rated thermostat opening temperature, the thermostat valve remains closed. This prevents circulation of the coolant to the radiator and allows the engine to warm up quickly. After the coolant temperature reaches rated thermostat opening temperature, the thermostat valve will open. The coolant is then allowed to circulate through the thermostat to the radiator where the engine heat is dissipated to the atmosphere. The thermostat also provides a restriction in the cooling system, even after it has opened. This restriction creates a pressure difference which prevents cavitation at the water pump and forces coolant to circulate through the engine block.

Engine Oil Heat Exchanger

The engine oil heat exchanger is mounted to the top of the engine block, under the intake manifold flange. Oil is pumped through the oil cooler inlet pipe to the heat exchanger, back through the oil cooler outlet pipe, and then to the oil passages in the engine for lubrication. The exchanger provides the following 2 functions

1. Engine coolant warms up faster than the engine oil. During cold operation, the coolant warms the oil and provides better flow during cold engine operation.
2. After the engine reaches normal operating temperature, the engine oil temperature will exceed the engine coolant temperature. The coolant flowing through the engine oil cooler will absorb heat from the engine oil. Cooling the engine oil extends oil life and helps reduce internal engine wear.

Transmission Oil Cooler - V09

The transmission oil cooler (TOC) is an oil-to-water heat exchanger located in the radiator end tank and is non-serviceable. The transmission oil temperature is regulated by the temperature of the coolant leaving the radiator. The oil out of the transmission is plumbed through the TOC lines to the radiator end tank cooler then directed back to the transmission.

Transmission Oil Cooler - V03/V92

The transmission oil cooler (TOC) is an oil-to-air heat exchanger located between the radiator and the A/C condenser. The transmission oil temperature is regulated by the airflow passing over this heat exchanger. The oil out of the transmission is plumbed through the TOC lines to the cooler then directed back to the transmission. This cooler helps provided additional cooling for performance driving conditions.

Transmission Oil Cooler Lines

The transmission oil cooler (TOC) lines use quick connect fittings that must be removed using a special tool. The oil out of the transmission is pumped at a high pressure through the TOC lines to the heat exchanger and then directed back to the transmission.

Power Steering Oil Cooler

Some vehicles are equipped with a power steering oil cooler located either between the radiator and condenser (Heavy Duty) or in front of the engine. This cooler transfers heat from the power steering system to the air passing through the condenser and radiator. The cooler uses constant tension clamps on the hose connections to the cooler.

Illustration Tool Number/Description EN 46104 Water Pump Pulley Holding Tool GE 47716 Vac N Fill Coolant Refill Tool J 23688 Coolant and Battery Fluid Tester J 24460-01 Cooling System Pressure Tester J 24731 Tempil Stick J 26568 Coolant and Battery Fluid Tester J 28410 Gasket Remover (Aluminum Components) J 38185 Hose Clamp Pliers J 38778 Door Trim Pad Clip Remover J 41240 Fan Clutch Remover and Installer J 42401 Radiator Cap/Surge Tank Test Adapter J 46143 Cooling System Adapter

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Power Distribution Schematics
• Component Connector End Views
• Engine Control Module Description
• Circuit Testing
• Connector Repairs
• Electrical Center Identification Views
• Probing Electrical Connectors
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Instrument Cluster Description and Operation
• Indicator/Warning Message Description and Operation
• Audible Warnings Description and Operation
• Coolant in Combustion Chamber
• Coolant in Engine Oil
• Coolant in Combustion Chamber
• Coolant in Engine Oil
• Coolant in Combustion Chamber
• Coolant in Engine Oil
• Engine Controls Schematics
• Checking Aftermarket Accessories
• Diagnostic Trouble Code (DTC) List - Vehicle
• Drive Belt Tensioner Diagnosis
• Drive Belt Tensioner Diagnosis
• Water Pump and Generator Belt Tensioner Replacement
• Drive Belt Tensioner Replacement - Generator
• Diagnostic Starting Point - Vehicle
• Heater Core Replacement
• Engine Coolant/Water in Transmission
• Engine Will Not Crank - Crankshaft Will Not Rotate
• Lower Engine Noise, Regardless of Engine Speed
• Cylinder Leakage Test
• Moving Parts and Hot Surfaces Warning
• Approximate Fluid Capacities
• Engine Will Not Crank - Crankshaft Will Not Rotate
• Lower Engine Noise, Regardless of Engine Speed
• Lifting and Jacking the Vehicle
• Front Air Deflector Replacement
• Intake Manifold Sight Shield Replacement
• Fastener Caution
• Front Compartment Sight Shields Replacement
• Engine Oil and Transmission Fluid Cooler Replacement
• Air Cleaner Outlet Duct Replacement
• Air Cleaner Outlet Duct Replacement
• Water Outlet Housing Disassemble
• Water Outlet Housing Cleaning and Inspection
• Water Outlet Housing Assemble
• Water Outlet Housing Cleaning and Inspection
• Water Pump Cleaning and Inspection
• DTC P0480 or P0481
• Symptoms - Engine Cooling
• Loss of Coolant (LC3)
• Loss of Coolant (LH2, LY7, LLT)
• Radiator Cleaning (Charge Air Cooling)
• Radiator Cleaning (Powertrain)
• Fan Clutch Diagnosis
• Fastener Tightening Specifications
• Flushing (Charge Air Cooling)
• Flushing (Powertrain)
• Charge Air Cooling System Coolant Level Inspection