Engine Cooling System Cadillac CTS II

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Typical Scan Tool Data

Cooling Fan Relays

Circuit/System Description

The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans. The engine control module (ECM) uses two fan control circuits and a series of three relays to command 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.

Conditions for Running the DTC

1. The ignition voltage is between 11-18 V.
2. The engine speed is greater than 400 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.
4. DTC P0480 and P0481 run continuously when the conditions above are met.

P0480

The ECM detects an open circuit, short to ground, or a short to voltage on the low speed cooling fan 1 relay control circuit.

P0481

The ECM detects an open circuit, short to ground, or a short to voltage on the high speed cooling fan relay 2 and 3 control circuit.

Action Taken When the DTC Sets

DTCs P0480 and P0481 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0480 and P0481 are Type B DTCs.

Diagnostic Aids

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a low speed Cooling Fan Relay 2 and 3 operates one fan at a high speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

Reference Information

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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

1. Ignition ON, command the KR20 cooling fan relays ON and OFF with a scan tool. Listen or feel the relay click.
2. Ignition ON, observe the scan tool Cooling Fan Relay 1 and the Cooling Fan Relay 2 and 3 Control Circuit Test Status parameters. Command the cooling fans ON and OFF with a scan tool. Verify all of the Cooling Fan Relay Control Circuit Test Status parameters display OK or Not Run in each of the commanded states.
3. Engine operating, observe the DTC information with a scan tool. DTC P0480 and P0481 should not set.
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.

Circuit/System Testing

1. Ignition OFF, disconnect all of the KR20 cooling fan relays.
2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below: KR20C cooling fan low speed relay terminal 85 KR20D cooling fan high speed relay terminal 85 KR20E cooling fan speed control 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. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL. KR20C cooling fan low speed relay terminal 86 KR20D cooling fan high speed relay terminal 86 KR20E cooling fan speed control relay terminal 85 If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON. If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
5. If all circuits test normal, test or replace the appropriate KR20 relay.

Component Testing

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 215-255 ohms between terminals 85 and 86 of the relay. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect 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 KR20 cooling fan relay.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Cooling Fan Relays

The engine cooling fan system consists of one electrical cooling fan, a serviceable resistor module mounted in the cooling fan shroud, and three fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate the fan at low, medium, or high speeds, depending on cooling requirements. The resistor module is a self-contained unit providing a specific resistance through three individual circuits. To activate the fan, the ECM applies ground to the coil side of the applicable fan relays. The cooling fan and fan relays receive battery voltage from the underhood fuse block. The ground path for the operation of the cooling fan is provided at G104.

1. The ignition voltage is between 11-18 volts.
2. The engine speed is greater than 400 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.
4. DTC P0480 and P0481 run continuously when the conditions above are met.

The ECM detects an open circuit, short to ground, or a short to voltage on the low speed cooling fan 1 relay control circuit, for greater than 200 mS.

The ECM detects an open circuit, short to ground, or a short to voltage on the high speed cooling fan relay 2 and 3 control circuit, for greater than 200 mS.

DTCs P0480 and P0481 are Type B DTCs.

DTCs P0480 and P0481 are Type B DTCs.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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 KR20 cooling fan relays ON and OFF with a scan tool. Listen or feel the relay click.
2. Ignition ON, observe the scan tool Cooling Fan Relay 1 and the Cooling Fan Relay 2 and 3 Control Circuit Test Status parameters. Command the cooling fan ON and OFF with a scan tool. Verify all of the Cooling Fan Relay Control Circuit Test Status parameters display OK or Not Run in each of the commanded states.
3. Engine operating, observe the DTC information with a scan tool. DTC P0480 and P0481 should not set.
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 all of the KR20 cooling fan relays.
2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below: KR20C cooling fan low speed relay terminal 85 KR20D cooling fan high speed relay terminal 85 KR20E cooling fan speed control 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. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL. KR20C cooling fan low speed relay terminal 86 KR20D cooling fan high speed relay terminal 86 KR20E cooling fan speed control relay terminal 85 If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON. If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
5. If all circuits test normal, test or replace the appropriate KR20 relay.

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect 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 KR20 cooling fan relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Cooling Fan Relays

The engine cooling fan system consists of one electrical cooling fan, a serviceable resistor module mounted in the cooling fan shroud, and three fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate the fan at low, medium, or high speeds, depending on cooling requirements. The resistor module is a self-contained unit providing a specific resistance through three individual circuits. To operate the fan, the ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. The cooling fan and fan relays receive battery voltage from the underhood fuse block. The ground path for the operation of the cooling fan is provided at G104.

1. The ignition voltage is between 10-18 volts.
2. The engine speed is greater than 80 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.
4. DTC P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met for greater 5 mS.

The ECM detects an open in the cooling fan relay 1 control circuit.

The ECM detects an open in the cooling fan relay 2 control circuit.

P0691

The ECM detects a short to ground in the cooling fan relay 1 control circuit.

P0692

The ECM detects a short to voltage in the cooling fan relay 1 control circuit.

P0693

The ECM detects a short to ground in the cooling fan relay 2 and 3 control circuit.

P0694

The ECM detects a short to voltage in the cooling fan relay 2 and 3 control circuit.

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

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

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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 KR20 cooling fan relays ON and OFF with a scan tool. Listen or feel the relay click.
2. Ignition ON, observe the scan tool Cooling Fan Relay 1 and the Cooling Fan Relay 2 and 3 Control Circuit Test Status parameters. Command the cooling fan ON and OFF with a scan tool. Verify all of the Cooling Fan Relay Control Circuit Test Status parameters display OK or Not Run in each of the commanded states.
3. Engine operating, observe the DTC information with a scan tool. DTC P0480, P0481, P0691, P0692, P0693, or P0694 should not set.
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 all of the KR20 cooling fan relays.
2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below: KR20C cooling fan low speed relay terminal 85 KR20D cooling fan high speed relay terminal 85 KR20E cooling fan speed control 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. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL. KR20C cooling fan low speed relay terminal 86 KR20D cooling fan high speed relay terminal 86 KR20E cooling fan speed control relay terminal 85 If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON. If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
5. If all circuits test normal, test or replace the appropriate KR20 relay.

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect 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 KR20 cooling fan relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Cooling Fan Relays

The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans. The engine control module (ECM) uses two fan control circuits and a series of three relays to command the fans ON in either high speed or low speed, depending on cooling requirements. To operate the fan, the ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

1. The ignition voltage is between 10-18 volts.
2. The engine speed is greater than 80 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.
4. DTC P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met for greater 5 mS.

The ECM detects an open in the cooling fan relay 1 control circuit.

The ECM detects an open in the cooling fan relay 2 control circuit.

The ECM detects a short to ground in the cooling fan relay 1 control circuit.

The ECM detects a short to voltage in the cooling fan relay 1 control circuit.

The ECM detects a short to ground in the cooling fan relay 2 and 3 control circuit.

The ECM detects a short to voltage in the cooling fan relay 2 and 3 control circuit.

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

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

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates one fan at a high speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation (LF1, LLT) or Cooling System Description and Operation (LSA)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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 KR20 cooling fan relays ON and OFF with a scan tool. Listen or feel the relay click.
2. Ignition ON, observe the scan tool Cooling Fan Relay 1 and the Cooling Fan Relay 2 and 3 Control Circuit Test Status parameters. Command the cooling fans ON and OFF with a scan tool. Verify all of the Cooling Fan Relay Control Circuit Test Status parameters display OK or Not Run in each of the commanded states.
3. Engine operating, observe the DTC information with a scan tool. DTC P0480, P0481, P0691, P0692, P0693, or P0694 should not set.
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 all of the KR20 cooling fan relays.
2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below: KR20C cooling fan low speed relay terminal 85 KR20D cooling fan high speed relay terminal 85 KR20E cooling fan speed control 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. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL. KR20C cooling fan low speed relay terminal 86 KR20D cooling fan high speed relay terminal 86 KR20E cooling fan speed control relay terminal 85 If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON. If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
5. If all circuits test normal, test or replace the appropriate KR20 relay.

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 215-255 ohms between terminals 85 and 86. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect 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 KR20 cooling fan relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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 operating for greater than 30 seconds.
2. DTC P0116, P0117, P0118, or P0128 is not set.

Conditions for Setting the DTC

1. The ECM detects that engine coolant temperature is greater than 136°C (277°F) for greater than 1 second or a cumulative time of 10 seconds, for V6 applications.
2. The ECM detects that the engine coolant temperature is greater than 131°C (267.8°F) for greater than 7 seconds, for V8 applications.

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

DTC P1258 is a Type A DTC.

Description and Operation

Cooling System Description and Operation (LF1, LLT) or Cooling System Description and Operation (LSA)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Note. If DTCs P0480, P0481, P0691, P0692, P0693, or P0694 is set, diagnose the DTC first.

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/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
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 (Single Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Inoperative (Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Test the thermostat for correct operation. Refer to «Thermostat Diagnosis (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis-lf1-llt) or «Thermostat Diagnosis (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis-lsa) .
6. Test the engine cooling system for overheating. Refer to «Engine Overheating (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating-lf1-llt) or «Engine Overheating (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating-lsa) .
7. Inspect the water pump and coolant flow for correct operation. Refer to «Water Pump Replacement (LF1/LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Water Pump Replacement (LSA)»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-diagnostic-information-and-procedures__coolant-in-combustion-chamber) and «Coolant in Engine Oil»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-diagnostic-information-and-procedures__coolant-in-engine-oil) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Important Preliminary Inspections Before Starting

Before using the Symptom diagnosis, perform the following

1. Perform «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) and verify all of the following items: Ensure that the engine control module (ECM) and indicator lamp are operating correctly. Ensure that there are no diagnostic trouble codes (DTCs) that are stored. Scan tool data is within a normal operating range.
2. Verify the customer concern.
3. Perform the Visual/Physical Inspection in this section. The visual/physical inspection is extremely important, and can lead to correcting a condition without additional testing. It may also help reveal the cause of an intermittent condition.
4. Locate the correct symptom. Perform the tests and inspections associated with the symptom.

Review the entire cooling system operation in order to familiarize yourself with the system functions. Refer to Cooling Fan Description and Operation and Cooling System Description and Operation (LF1, LLT) or Cooling System Description and Operation (LSA) .

Visual/Physical Inspection

Several of the symptom procedures call for a careful visual and physical inspection. This can lead to correcting a condition without further tests and can save time. This inspection should include the following areas

1. Ensure that the control module grounds are clean, tight, and correctly located.
2. Inspect cooling system hoses and pipes for splits, kinks, and proper connections. Inspect thoroughly for any type of a leak or a restriction.
3. Inspect for a dirty or restricted radiator and HVAC condenser.
4. Inspect for aftermarket devices which could affect the operation of the Cooling System.
5. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
6. Inspect the surge tank reservoir for the proper coolant level.

Identifying Intermittent Conditions

Many intermittent conditions occur with harness or connector movement due to engine torque, rough pavement, vibration or physical movement of a component. Refer to the following for a list to help isolate an intermittent condition

1. Moisture and water intrusion in connectors, terminals, and components
2. Connector mating
3. Terminal contact
4. High circuit or component resistance-High resistance can include any resistance, regardless of the amount, which can interrupt the operation of the component.
5. Harness' that are routed too tight, or chaffed circuits
6. High or low ambient temperature
7. High or low engine coolant temperatures
8. High underhood temperatures
9. Heat build up in component or circuit due to circuit resistance, poor terminal contact, or high electrical load
10. High or low system voltage
11. High vehicle load conditions
12. Rough road surface
13. Electro-magnetic interference (EMI)/circuit interference from relays, solenoids or other electrical surge
14. Incorrect installation of non-factory, aftermarket, and after factory add on accessories

If an intermittent is detected, refer to Testing for Intermittent Conditions and Poor Connections for specific strategies in diagnosing intermittent conditions.

Symptom List

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

1. «Cooling Fan Always On (Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Always On (Single Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Cooling Fan Inoperative (Single Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling Fan Inoperative (Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Overheating (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating-lf1-llt) or «Engine Overheating (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating-lsa)
4. «Loss of Coolant»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant)
5. «Thermostat Diagnosis (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis-lf1-llt) or «Thermostat Diagnosis (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis-lsa)
6. «Engine Fails To Reach Normal Operating Temperature»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__engine-fails-to-reach-normal-operating)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine cooling system contains an engine coolant level switch to alert the driver in the event of a low coolant level. The coolant level switch is mounted at the lowest point in the cooling system surge tank. If the amount engine coolant in the surge tank drops below the level of the switch, the coolant level switch opens. The coolant level switch signal circuit is monitored by the heating, ventilation, and air conditioning (HVAC) control module. If the HVAC control module detects an open circuit, or a high voltage condition on the signal circuit for greater than 10 seconds, a Class 2 message is sent to the radio, requesting display of the low coolant level message.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation (LF1, LLT) or Cooling System Description and Operation (LSA)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Definitions

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, verify the radiator surge tank is filled to the correct level, with engine coolant.
2. Ignition ON, observe the scan tool coolant level parameter. The parameter should display OK.
3. The low engine coolant level message should not be displayed, with the engine coolant in the surge tank at the proper level.

Note. Circuit/System Verification must be performed before performing the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the B33 coolant level switch.
2. Test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool coolant level switch parameter displays LOW. If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K33 HVAC control module.
4. Install a 3 A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the scan tool coolant level parameter displays OK. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K33 HVAC control module.
5. If all circuits test normal, test or replace the B33 coolant level switch.

1. «Instrument Cluster Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges) or «Instrument Cluster Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
2. «Radiator Surge Tank Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Repair Verification

Verify that the low coolant indicator is not displayed with the engine coolant at the correct level.

The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans. The engine control module (ECM) uses two fan control circuits and a series of three relays to command 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.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a low speed Cooling Fan Relay 2 and 3 operates one fan at a high speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480 or P0481 is not set. If a DTC is set, refer to «DTC P0480 or P0481 (V8 or LF1 with/Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «DTC P0480 or P0481 (V6-LF1)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, observe the scan tool FC Relay 1 and FC Relay 2 and 3 Command parameters. The parameters should display OFF.
3. Ignition ON, observe that the fan is not activated.

1. Ignition OFF, disconnect each KR20 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 KR20 cooling fan relay.

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified range, replace the KR20 cooling fan relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Install a 20 A 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 KR20 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 cooling fan system consists of one electrical cooling fan, a serviceable resistor module mounted in the cooling fan shroud, and three fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate the fan at low, medium, or high speeds, depending on cooling requirements. The resistor module is a self-contained unit providing a specific resistance through three individual circuits. To activate the fan, the ECM applies ground to the coil side of the applicable fan relays. The cooling fan and fan relays receive battery voltage from the underhood fuse block. The ground path for the operation of the cooling fan is provided at G104.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480, P0481, P0691, P0692, P0693, P0694 is not set. If a DTC is set, refer to «DTC P0480 or P0481 (V8 or LF1 with/Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «DTC P0480 or P0481 (V6-LF1)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) for V8 or V6 LF1, or «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT and Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) for V6 LLT.
2. Ignition ON, observe the scan tool FC Relay 1 and FC Relay 2 and 3 Command parameters. The parameters should display OFF.
3. Ignition ON, observe that the fan is not activated.

1. Ignition OFF, disconnect each KR20 cooling fan relay one at a time.
2. Ignition ON, observe that the cooling fan is not activated. If the fan is activated, test for a short to voltage in the relay controlled output circuits. If the fans is not activated, test or replace the appropriate cooling fan relay.

1. Ignition OFF, disconnect the appropriate cooling fan relay.
2. Test for 200-240 ohms between terminals 85 and 86 of the relay. If not within the specified range, replace the relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, 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 20 A fused jumper wire between B+ and relay terminal 85. Connect 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 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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine cooling fan system consists of one electrical cooling fan, a serviceable resistor module mounted in the cooling fan shroud, and three fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate the fan at low, medium, or high speeds, depending on cooling requirements. The resistor module is a self-contained unit providing a specific resistance through three individual circuits. To activate the fan, the ECM applies ground to the coil side of the applicable fan relays. The cooling fan and fan relays receive battery voltage from the underhood fuse block. The ground path for the operation of the cooling fan is provided at G104.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480, P0481, P0691, P0692, P0693 or P0694 is not set. If a DTC is set, refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT and Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, command the fan relays ON and OFF with a scan tool. Verify that the fan operates at low, medium and high speed.

1. Ignition OFF, disconnect the harness connector at the R10 cooling fan resistor.
2. Test for less than 5 ohms between the cooling fan motor ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for and open/high resistance.
3. Connect a test lamp between the G10 cooling fan motor voltage supply circuit terminal 4 and ground. Command the FC relay 1 ON and OFF with a scan tool. The test lamp should respond to the scan tool commands. If the test lamp remains OFF all of the time, test the voltage supply circuit for an open/high resistance or a short to ground. If the circuit tests normal, test or replace the KR20C relay.
4. Connect a test lamp between the G10 cooling fan motor voltage supply circuit terminal 3 and ground. Command the FC relay 2 and 3 ON and OFF with a scan tool. The test lamp should respond to the scan tool commands. If the test lamp remains OFF all of the time, test the voltage supply circuit for an open/high resistance or a short to ground. If the circuit tests normal, test or replace the KR20D relay.
5. Connect a test lamp between the G10 cooling fan motor voltage supply circuit terminal 1 and ground. Command the FC relay 2 and 3 ON and OFF with a scan tool. The test lamp should remain OFF. If the test lamp illuminates, test or replace the KR20E relay.
6. Connect a test lamp between the G10 cooling fan motor voltage supply circuit terminal 1 and ground. Command the FC relay 1, 2 and 3 ON and OFF with a scan tool. The test lamp should respond to the scan tool commands. If the test lamp remains OFF all of the time, test the voltage supply circuit for an open/high resistance or a short to ground. If the circuit tests normal, test or replace the KR20E relay.
7. Connect the harness connector at the R10 cooling fan resistor. Disconnect the harness connector at the G10 cooling fan motor.
8. Connect a test lamp between the voltage supply circuit terminal 1 and the ground circuit terminal 2. Command the cooling fans ON in all 3 speeds. Verify the test lamp illuminates in all 3 speeds. If the test does not illuminate in all 3 speeds, replace the R10 cooling fan resistor.
9. If all circuits/connections test normal, replace the G10 cooling fan motor.

1. Ignition OFF, disconnect the appropriate KR20 cooling fan relay.
2. Test for 200-240 ohms between terminals 85 and 86 of the relay. If not within the specified range, replace the KR20 cooling fan relay.
3. Test for infinite resistance between the terminals listed below. 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Install a 20 A fused jumper wire between B+ and relay terminal 85. Connect 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 KR20 cooling fan relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Motor Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Motor Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Coolant Fan Resistor Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans. The engine control module (ECM) uses two fan control circuits and a series of three relays to command 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.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a low speed Cooling Fan Relay 2 and 3 operates one fan at a high speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. KR20 cooling fan relay identification: KR20C cooling fan low speed FAN 1 Relay KR20D cooling fan high speed FAN 2 Relay KR20E cooling fan speed control FAN 3 or S/P Relay
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480, P0481, P0691, P0692, P0693, or P0694 is not set. If a DTC is set, refer to «DTC P0480 or P0481 (V8 or LF1 with/Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «DTC P0480 or P0481 (V6-LF1)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) for V8 or V6 LF1, or «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT and Dual Fan)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) for V6 LLT.
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 KR20 cooling fan relays.
2. Connect a 40 A fused jumper between the KR20E S/P or FAN 3 relay switch circuit terminal 30 and the ground circuit terminal 87.
3. Ignition ON, verify that a test lamp illuminates between ground and the relay switched ignition circuit terminal listed below: KR20C low speed FAN 1 relay terminal 87 KR20D high speed FAN 2 relay terminal 87 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 appropriate KR20 relay.
4. Connect a 40 A fused jumper between the KR20 cooling fan relay circuit terminals listed below. Verify the appropriate fan is activated. KR20D high speed FAN 2 relay terminals 87 and 30 KR20C low speed FAN 1 relay terminals 87 and 30 If the corresponding cooling fan does not activate, test the relay controlled output circuit and the cooling fan ground circuit for an open/high resistance. If the circuits tests normal, replace the appropriate G10 cooling fan motor. If the corresponding cooling fan activates, replace the appropriate KR20 cooling fan relay.
5. Install the KR20E S/P or FAN 3 relay. Verify both fans activate at low speed. If both fans do not activate, test the relay controlled output circuit terminal 87A of the KR20E fan relay for a short to ground or an open/high resistance.
6. If the circuits test normal, test or replace the KR20E cooling fan speed control relay.

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 215-255 ohms between terminals 85 and 86 of the relay. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified range, replace the KR20 cooling fan relay.
4. Test the KR20E relay for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan relay.
5. Install a 20 A 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 KR20 cooling fan relay.

G10L and G10R Engine Cooling Fan

1. Ignition OFF, disconnect the harness connector at the G10 engine cooling fan assembly.
2. Connect a jumper wire between ground and the G10 ground circuit terminal 2.
3. Connect a 40 A fused jumper wire between B+ and the G10 B+ supply circuit terminal 1. The cooling fan should operate at a High speed: If the cooling fan does operate, replace the G10 engine cooling fan.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Motor Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Motor Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Overheating (LF1, LLT)

Engine Overheating (LSA)

Loss of Coolant

Thermostat Diagnosis (LF1, LLT)

Tools Required

1. J 24731 188 Tempilstick. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 24731 206 Tempilstick. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

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

1. Use a tempilstick in order to find the opening and the closing temperatures of the thermostat. J 24731 188 tempilstick melts at 87°C (188°F). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) . The thermostat should begin to open at 90°C (194°F). J 24731 206 tempilstick melts at 97°C (206°F). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) . The thermostat should be fully open at 107°C (225°F).
2. Replace the thermostat if it does not operate properly between this temperature range.

Thermostat Diagnosis (LSA)

Tools Required

1. J 24731 188 Tempilstick. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 24731 206 Tempilstick. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

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/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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 (LF1/LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Coolant Heater Cord Replacement (LF1/LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Cord Replacement (LSA - 110 Volt)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Coolant Heater Cord Replacement (LSA - 240 Volt)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Fails To Reach Normal Operating Temperature

Pressure Cap Testing

Special Tools

1. J 24460-01 Cooling System Pressure Tester. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 42401 Radiator Cap / Surge Tank Test Adapter. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

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/cts/ii-2007-2014/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/cts/ii-2007-2014/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.

Cooling System Leak Testing

Special Tools

1. J 24460-01 Cooling System Pressure Tester. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 42401 Radiator Cap / Surge Tank Test Adapter. See «Special Tools»(/cadillac/cts/ii-2007-2014/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»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__pressure-cap-testing) .
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/cts/ii-2007-2014/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 gauge for any pressure loss.
6. Repair any leaks as required.

Special Tools

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

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
4. Remove the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/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 (Powertrain)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) «Flushing (Charge Air Cooling)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) . 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/cts/ii-2007-2014/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/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
4. Remove the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Place a drain pan under the radiator.
6. Remove the radiator outlet hose. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)

1. Install the radiator outlet hose. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
2. Install the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

Cooling System Draining and Filling (GE 47716 LSA)

Special Tools

1. GE-47716 Vac N Fill Coolant Refill Tool. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 26568 Coolant and Battery Fluid Tester. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. J 42401 Radiator Cap and Surge Tank Test Adapter. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
4. Remove the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Place a drain pan under the radiator.
6. Remove the radiator outlet hose. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

Vac N Fill Procedure

1. Install the radiator outlet hose. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Install the J 42401 onto the coolant surge tank. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Attach the Vac N Fill cap to the J 42401 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Attach the vacuum gauge assembly to the Vac N Fill cap.
5. Attach the fill hose to the barb fitting on the vacuum gauge assembly. Ensure that the valve is closed.
6. Pour the coolant mixture into the graduated reservoir.
7. Place the fill hose in the graduated reservoir.
8. Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
9. Attach the venturi assembly to the vacuum tank.
10. Attach a shop air hose to the venturi assembly. Ensure the valve on the venturi assembly is closed.
11. Attach the vacuum hose to the vacuum gauge assembly and the vacuum tank.
12. Open the valve on the venturi assembly. The vacuum gauge will begin to rise and a hissing noise will be present.
13. 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.
14. To aid in the fill process, position the graduated reservoir above the coolant fill port.
15. Slowly open the valve on the vacuum gauge assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose.
16. Close the valve on the venturi assembly.
17. 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»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
18. Open the valve on the vacuum gauge assembly. The vacuum gauge will drop as coolant is drawn into the system.
19. Once the vacuum gauge reaches zero, close the valve on the vacuum gauge assembly and repeat steps 11-17.
20. Detach the Vac N Fill cap from the J 42401 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
21. Remove the J 42401 from the coolant surge tank. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
22. Add coolant to the system as necessary.
23. Inspect the concentration of the coolant mixture using J 26568 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
24. Detach the vacuum hose from the vacuum gauge assembly.
25. Attach the extraction hose to the vacuum hose.
26. Open the valve on the venturi assembly to start a vacuum draw.
27. Use the extraction hose to draw out coolant to the proper level.
28. 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.
29. Install the surge tank cap.

Cooling System Draining and Filling (GE 47716 LF1, LLT)

Special Tools

1. GE-47716 Vac N Fill Coolant Refill Tool. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 26568 Coolant and Battery Fluid Tester. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. J 42401 Radiator Cap and Surge Tank Test Adapter. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .

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/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
4. Remove the air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/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 (Powertrain)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) or «Flushing (Charge Air Cooling)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) . Normal in appearance - Follow the Vac N Fill Procedure below.
9. Tighten the drain cock.

1. Install the J 42401 onto the coolant surge tank. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Attach the Vac N Fill cap to the J 42401 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Attach the vacuum gauge assembly to the Vac N Fill cap.
4. Attach the fill hose to the barb fitting on the vacuum gauge 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 gauge assembly and the vacuum tank.
11. Open the valve on the venturi assembly. The vacuum gauge 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 gauge 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»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
17. Open the valve on the vacuum gauge assembly. The vacuum gauge will drop as coolant is drawn into the system.
18. Once the vacuum gauge reaches zero, close the valve on the vacuum gauge assembly and repeat steps 11-17.
19. Detach the Vac N Fill cap from the J 42401 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
20. Remove the J 42401 from the coolant surge tank. See «Special Tools»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
23. Detach the vacuum hose from the vacuum gauge 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.

Charge Air Cooling System Coolant Level Inspection

1. Remove the cap from the charge air cooler reservoir
2. Verify that the coolant is within the cold fill range on the charge air cooling system reservoir.
3. Add coolant as necessary to the fill neck and reservoir to bring the coolant level within the cold fill range.
4. Install the cap to the charge air cooler reservoir.

Charge Air Cooling System Draining and Filling (Static)

Special Tools

1. 7000081: Tech 2 Kit
2. J 26568: Coolant and Battery Fluid Tester

1. Remove the cap from the charge air cooler reservoir.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
4. Place a drain pan under the charge air cooler radiator.
5. Remove the charge air cooler radiator drain plug (1) from the bottom passenger side of the charge air cooler.
6. Drain the charge air cooling system.
7. Inspect the coolant.
8. 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 (Powertrain)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) or «Flushing (Charge Air Cooling)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) .
9. Install the charge air cooler radiator drain plug (1) and tighten to 1.5 N.m (13 lb in).
10. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
11. Lower the vehicle.

Filling Procedure

1. Remove the front compartment sight shield. Refer to «Front Compartment Sight Shields Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
2. Loosen the bleeder screw (1) from the charge air cooler radiator on the top driver side of the charge air cooler.
3. Slowly add a mixture of 50/50 DEX-COOL antifreeze and clean, drinkable water to the cooling system until the coolant level reaches the top of the charge air cooler radiator at the bleeder screw opening. Refer to «Approximate Fluid Capacities»(/cadillac/cts/ii-2007-2014/remont/lubrication-system/#maintenance-and-lubrication__approximate-fluid-capacities) .
4. Install the bleeder screw (1) and tighten to 1.5 N.m (13 lb in).
5. Slowly add the coolant mixture to the charge air cooler reservoir until the coolant level is at the top of the cold fill level range on the reservoir.
6. Install the cap to the charge air cooler reservoir.
7. Using a Tech 2 Scan Tool, cycle the charge air coolant pump ON for 2 seconds.
8. Cycle the charge air coolant pump OFF.
9. Remove the charge air cooler reservoir cap, and wait for the air bubbles to travel up the charge air cooler reservoir hose to the reservoir.
10. Slowly add the coolant mixture to the charge air cooler reservoir until the coolant level is at the top of the cold fill level range on the reservoir.
11. Install the cap to the charge air cooler reservoir.
12. Repeat steps 7-11 until all of the air has been purged from the system and no air bubbles travel up the charge air cooler reservoir hose to the reservoir.
13. Install the charge air cooler reservoir cap and cycle the charge air coolant pump ON for 5 minutes.
14. Cycle the charge air coolant pump OFF.
15. Remove the charge air cooler reservoir cap and allow the vehicle to sit for 15 minutes.
16. Slowly add the coolant mixture to the charge air cooler reservoir until the coolant level is at the top of the cold fill level range on the reservoir.
17. Inspect the concentration of the charge air cooling system coolant using the J 26568: Coolant and Battery Fluid Tester
18. Install the charge air cooler reservoir cap.
19. Inspect the cooling system for leaks.
20. Install the front compartment sight shield. Refer to «Front Compartment Sight Shields Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
21. Rinse away any excess coolant from the engine and the engine compartment.

Charge Air Cooling System Draining and Filling (GE 47716)

Special Tools

1. GE-47716: Vac N Fill Coolant Refill Tool
2. J 26568: Coolant and Battery Fluid Tester
3. J 46143: Cooling System Adapter

1. Remove the cap from the charge air cooler reservoir.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
4. Place a drain pan under the charge air cooler radiator.
5. Remove the charge air cooler radiator drain plug (1) from the bottom passenger side of the charge air cooler.
6. Drain the charge air cooling system.
7. Inspect the coolant.
8. 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 (Powertrain)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-powertrain) or «Flushing (Charge Air Cooling)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__flushing-charge-air-cooling) .
9. Install the charge air cooler radiator drain plug (1) and tighten to 1.5 N.m (13 lb in).
10. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
11. Lower the vehicle.

1. Install the J 46143: Cooling System Adapter onto the charge air cooler reservoir fill neck.
2. Attach the Vac N Fill cap to the J 46143: Cooling System Adapter.
3. Attach the vacuum gauge assembly to the Vac N Fill cap.
4. Attach the fill hose to the barb fitting on the vacuum gauge 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 gauge assembly and the vacuum tank.
11. Open the valve on the venturi assembly. The vacuum gauge 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 gauge 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»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
17. Open the valve on the vacuum gauge assembly. The vacuum gauge will drop as coolant is drawn into the system.
18. Once the vacuum gauge reaches zero, close the valve on the vacuum gauge assembly and repeat steps 11-17.
19. Detach the Vac N Fill cap from the J 46143: Cooling System Adapter.
20. Remove the J 46143: Cooling System Adapter from the coolant surge tank.
21. Add coolant to the system as necessary.
22. Inspect the concentration of the coolant mixture using J 26568: Coolant and Battery Fluid Tester.
23. Detach the vacuum hose from the vacuum gauge 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.

Flushing (Powertrain)

1. Block the drive wheels.
2. Place the transmission in PARK (P) or NEUTRAL (N).
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 (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
7. Fill the coolant reservoir to the FULL COLD mark.
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

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 (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Fill the cooling system to specifications when flushing is complete. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .

Radiator Cleaning

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.

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

J 38185: Hose Clamp Pliers

Removal Procedure

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .
2. Remove the rear intake manifold cover. Refer to «Intake Manifold Cover Replacement - Rear»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle)
3. Reposition the charge air cooler hose clamp (1) at engine using J 38185: Hose Clamp Pliers.
4. Remove the charge air cooler hose (2) from the engine.
5. Reposition the charge air cooler hose clamp (1) at charge air cooler pipe using J 38185: Hose Clamp Pliers.
6. Remove the charge air cooler hose (2) from the charge air cooler pipe.
7. Unclip hose from bracket.
8. Remove the charge air cooler hose from the vehicle.

Installation Procedure

1. Install the charge air cooler hose to the vehicle.
2. Clip hose from bracket.
3. Install the charge air cooler hose (2) to the charge air cooler pipe.
4. Reposition the charge air cooler hose clamp (1) at the charge air cooler pipe using J 38185: Hose Clamp Pliers.
5. Install the charge air cooler hose (2) to engine.
6. Reposition the charge air cooler hose clamp (1) at engine using J 38185: Hose Clamp Pliers.
7. Install the rear intake manifold cover. Refer to «Intake Manifold Cover Replacement - Rear»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle)
8. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .

J 38185: Hose Clamp Pliers

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .
2. Remove the rear intake manifold cover. Refer to «Intake Manifold Cover Replacement - Rear»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle)
3. Reposition the charge air cooler hose clamp (1) at engine using J 38185: Hose Clamp Pliers.
4. Remove the charge air cooler hose (2) from the engine.
5. Reposition the charge air cooler hose clamp (1) at charge air cooler reservoir using J 38185: Hose Clamp Pliers.
6. Remove the charge air cooler hose (2) from the charge air cooler reservoir.
7. Remove the charge air cooler hose from the vehicle.

1. Install the charge air cooler hose to the vehicle.
2. Install the charge air cooler hose (2) to the charge air cooler reservoir.
3. Reposition the charge air cooler hose clamp (1) at the charge air cooler reservoir using J 38185: Hose Clamp Pliers.
4. Install the charge air cooler hose (2) to engine.
5. Reposition the charge air cooler hose clamp (1) at engine using J 38185: Hose Clamp Pliers.
6. Install the rear intake manifold cover. Refer to «Intake Manifold Cover Replacement - Rear»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle)
7. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .

J 38185: Hose Clamp Pliers

1. Drain the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information)
3. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia)
4. Reposition the charge air cooler hose clamp (1) at the charge air cooler using J 38185: Hose Clamp Pliers.
5. Remove the charge air cooler hose (2) from the charge air cooler.
6. Lower vehicle.
7. Remove right side compartment sight shield.
8. Reposition the charge air cooler hose clamp (1) at charge air cooler pipe assembly using J 38185: Hose Clamp Pliers.
9. Remove the charge air cooler hose (2) from the charge air cooler pipe assembly.
10. Unclip charge air cooler hose and remove from vehicle.

1. Install the charge air cooler hose to the vehicle and clip to hose.
2. Install the charge air cooler hose (2) to the charge air cooler pipe assembly.
3. Reposition the charge air cooler hose clamp (1) at the charge air cooler pipe assembly using J 38185: Hose Clamp Pliers.
4. Install right side compartment sight shield.
5. Install the charge air cooler hose (2) to the charge air cooler.
6. Reposition the charge air cooler hose clamp (1) at the charge air cooler using J 38185: Hose Clamp Pliers.
7. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia)
8. Lower the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information)
9. Fill the charge air cooling system. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .

Scheme 9

Scheme 10

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the front compartment sight shield. Refer to «Front Compartment Sight Shields Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
3. Remove the front compartment side sight shield. Refer to «Front Compartment Side Sight Shield Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
4. Remove the intake manifold cover front. Refer to «Intake Manifold Cover Replacement - Front»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle)
5. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions)
6. Reposition the surge tank inlet hose clamp (1) at surge tank using J 38185: Hose Clamp Pliers.
7. Remove the surge tank inlet hose (2) from the surge tank.
8. Disconnect the quick connect fitting (1) at the engine.
9. Disconnect the clip (2) at the air cleaner assembly.
10. Disconnect the quick connect fitting (1) at the engine.
11. Disconnect the clip (2) at the engine.
12. Reposition the surge tank inlet hose clamp (1) at radiator using J 38185: Hose Clamp Pliers.
13. Remove the surge tank inlet hose (2) from the radiator.
14. Remove the surge tank inlet hose from the vehicle.

1. Install the surge tank inlet hose to the vehicle.
2. Install the surge tank inlet hose (2) to the radiator.
3. Reposition the surge tank inlet hose clamp (1) at radiator using J 38185: Hose Clamp Pliers.
4. Connect the quick connect fitting (1) at the engine.
5. Connect the clip (2) at the engine.
6. Connect the quick connect fitting (1) at the engine.
7. Connect the clip (2) at the air cleaner assembly.
8. Install the surge tank inlet hose (2) to the surge tank.
9. Reposition the surge tank inlet hose clamp (1) at surge tank using J 38185: Hose Clamp Pliers.
10. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions)
11. Install the intake manifold cover front. Refer to «Intake Manifold Cover Replacement - Front»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle)
12. Install the front compartment side sight shield. Refer to «Front Compartment Side Sight Shield Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
13. Install the front compartment sight shield. Refer to «Front Compartment Sight Shields Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
14. Fill the coolant. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

J 47622: Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove cross vehicle brace. Refer to «Cross Vehicle Brace Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
3. Reposition the surge tank engine hose clamp (1) at surge tank using J 47622: Hose Clamp Pliers.
4. Remove the surge tank engine hose (2) from the surge tank.
5. Remove the rear intake manifold cover. Refer to «Intake Manifold Cover Replacement - Rear»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
6. Reposition the surge tank engine hose clamp (1) at heater hose assembly using J 47622: Hose Clamp Pliers.
7. Remove the surge tank engine hose nuts (2).
8. Remove the surge tank engine hose (3) from the vehicle.

1. Install the surge tank engine hose (3) to the vehicle.
2. Install the surge tank engine hose (2) and tighten to 10 N.m (89 lb in)
3. Reposition the surge tank engine hose clamp (1) at heater hose assembly using J 47622: Hose Clamp Pliers.
4. Install the rear intake manifold cover. Refer to «Intake Manifold Cover Replacement - Rear»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
5. Install the surge tank engine hose (2) to the surge tank.
6. Reposition the surge tank engine hose clamp (1) at surge tank using J 47622: Hose Clamp Pliers.
7. Install cross vehicle brace. Refer to «Cross Vehicle Brace Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

J 38185 Hose Clamp Pliers. See Special Tools .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Position J 38185 to the clamp in order to remove the engine hose (2) from the surge tank (1). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Loosen the bolt on the bracket which secures the surge tank engine hose to the engine.
4. Remove the windshield wiper transmission. Refer to «Windshield Wiper Transmission Replacement»(/cadillac/cts/ii-2007-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
5. Position J 38185 to the clamp in order to remove the surge tank engine hose from the thermostat assembly. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the surge tank engine hose from the engine.

1. Position the surge tank engine hose to the engine.
2. Position J 38185 to the clamp in order to connect the surge tank engine hose to the thermostat assembly. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Install the windshield wiper transmission. Refer to «Windshield Wiper Transmission Replacement»(/cadillac/cts/ii-2007-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
4. Install the bolt to the bracket securing the surge tank engine hose to the engine and tighten to 9 N.m (80 lb in).
5. Position J 38185 to the clamp in order to connect the engine hose (2) to the surge tank (1). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Air Cleaner Outlet Duct Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) .
3. Reposition the radiator inlet hose clamp (1) at the engine using J 38185: Hose Clamp Pliers.
4. Remove the radiator inlet hose (2) from the engine.
5. Reposition the radiator inlet hose clamp (1) at radiator using J 38185: Hose Clamp Pliers.
6. Remove the radiator inlet hose (2) from the radiator.
7. Remove the radiator inlet hose from the vehicle.

1. Install the radiator outlet hose to the vehicle.
2. Reposition the radiator outlet hose clamp (1) at radiator using J 38185: Hose Clamp Pliers.
3. Install the radiator outlet hose (2) from the radiator.
4. Install the radiator outlet hose (2) from the engine coolant inlet pipe.
5. Reposition the radiator outlet hose clamp (1) at the engine coolant inlet pipe using J 38185: Hose Clamp Pliers.
6. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Air Cleaner Outlet Duct Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) .
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

J 47622: Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the front compartment sight shield. Refer to «Front Compartment Sight Shields Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
3. Remove air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-repair-instructions)
4. Reposition the radiator inlet hose clamp (1) at radiator using J 47622: Hose Clamp Pliers.
5. Remove the radiator inlet hose (2) from the radiator.
6. Unclip the radiator inlet hose retainer (1) from the fan shroud.
7. Reposition the radiator inlet hose clamp (1) at engine using J 47622: Hose Clamp Pliers.
8. Remove the radiator inlet hose (2) from the engine.
9. Remove the radiator inlet hose from the vehicle.

1. Install the radiator inlet hose to the vehicle.
2. Install the radiator inlet hose (2) to the engine.
3. Reposition the radiator inlet hose clamp (1) at engine using J 47622: Hose Clamp Pliers.
4. Clip the radiator inlet hose retainer (1) to the fan shroud.
5. Install the radiator inlet hose (2) to the radiator.
6. Reposition the radiator inlet hose clamp (1) at radiator using J 47622: Hose Clamp Pliers.
7. Install air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-repair-instructions)
8. Install the front compartment sight shield. Refer to «Front Compartment Sight Shields Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures)
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Air Cleaner Outlet Duct Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) .
4. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
5. Reposition the radiator outlet hose clamp (1) at the engine coolant inlet pipe using J 38185: Hose Clamp Pliers.
6. Remove the radiator outlet hose (2) from the engine coolant inlet pipe.
7. Reposition the radiator outlet hose clamp (1) at radiator using J 38185: Hose Clamp Pliers.
8. Remove the radiator outlet hose (2) from the radiator.
9. Remove the radiator outlet hose from the vehicle.

1. Install the radiator outlet hose to the vehicle.
2. Reposition the radiator outlet hose clamp (1) at radiator using J 38185: Hose Clamp Pliers.
3. Install the radiator outlet hose (2) from the radiator.
4. Install the radiator outlet hose (2) from the engine coolant inlet pipe.
5. Reposition the radiator outlet hose clamp (1) at the engine coolant inlet pipe using J 38185: Hose Clamp Pliers.
6. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
7. Lower the vehicle.
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Air Cleaner Outlet Duct Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) .
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

J 47622: Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information)
3. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia)
4. Reposition the radiator outlet hose clamp (1) at radiator using J 47622: Hose Clamp Pliers.
5. Remove the radiator outlet hose (2) from the radiator.
6. Reposition the radiator outlet hose clamp (1) at engine oil cooler pipe using J 47622: Hose Clamp Pliers.
7. Remove the radiator outlet hose (3) from the engine oil cooler pipe.
8. Reposition the radiator outlet hose clamp (2) at engine using J 47622: Hose Clamp Pliers.
9. Remove the radiator outlet hose (3) from the engine.
10. Remove the radiator outlet hose (3) from the vehicle.

1. Install the radiator outlet hose (3) to the vehicle.
2. Install the radiator outlet hose (3) to the engine.
3. Reposition the radiator outlet hose clamp (2) at engine using J 47622: Hose Clamp Pliers.
4. Install the radiator outlet hose (3) to the engine oil cooler pipe.
5. Reposition the radiator outlet hose clamp (1) at engine oil cooler pipe using J 47622: Hose Clamp Pliers.
6. Install the radiator outlet hose (2) to the radiator.
7. Reposition the radiator outlet hose clamp (1) at radiator using J 47622: Hose Clamp Pliers.
8. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia)
9. Lower the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information)
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Scheme 11

Scheme 12

Scheme 13

J 38185: Hose Clamp Pliers

1. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information)
3. Reposition the radiator hose clamp (1) at engine oil cooler hose using J 38185: Hose Clamp Pliers.
4. Remove the radiator hose (2) from the engine oil cooler hose.
5. Remove the left engine splash shield.
6. Remove the air cleaner resonator outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-repair-instructions)
7. Remove the air cleaner. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions)
8. Reposition the engine oil cooler hose clamp (1) at engine using J 38185: Hose Clamp Pliers.
9. Remove the engine oil cooler hose (2) from the engine.
10. Remove the engine oil cooler bolt (4) from the engine.
11. Disconnect the engine oil cooler hoses (3) from the engine.
12. Remove the engine oil cooler hoses from the vehicle.

1. Install the engine oil cooler hoses to the vehicle.
2. Connect the engine oil cooler hoses (3) to the engine.
3. Install the engine oil cooler bolt (4) form the engine.
4. Install the engine oil cooler hose (2) to the engine.
5. Reposition the engine oil cooler hose clamp (1) at engine using J 38185: Hose Clamp Pliers.
6. Install the radiator hose (2) to the engine oil cooler hose.
7. Reposition the radiator hose clamp (1) at the engine oil cooler hose using J 38185: Hose Clamp Pliers.
8. install the air cleaner. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions)
9. Install the air cleaner resonator outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-repair-instructions)
10. Install the left engine splash shield.
11. Lower the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information)
12. Fill the charge air cooler coolant. Refer to «Charge Air Cooling System Draining and Filling (Static)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) or «Charge Air Cooling System Draining and Filling (GE 47716)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__charge-air-cooling-system-draining-and) .

Scheme 14

Scheme 15

1. Remove the cooling fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
2. Remove the cooling fan. Refer to «Engine Coolant Fan Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
3. Remove the motor retaining screws (1).
4. Remove the motor from the shroud (1).

1. Install the motor to the shroud (1).
2. Install the motor retaining screws (1) and tighten to 7 N.m (62 lb in).
3. Install the cooling fan. Refer to «Engine Coolant Fan Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)
4. Install the cooling fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system)

Scheme 16

Scheme 17

Scheme 18

Scheme 19

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the upper intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-repair-instructions-on-vehicle-1-of-2) .
3. Disconnect the surge tank outlet pipe from the thermostat. Refer to «Radiator Surge Tank Engine Hose Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (3).
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 3). Refer to «Engine Coolant Inlet Pipe Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Connect the surge tank outlet pipe to the thermostat. Refer to «Radiator Surge Tank Engine Hose Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the upper intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-repair-instructions-on-vehicle-1-of-2) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

1. Partially drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. For the LLT engine, remove the throttle body. Refer to «Throttle Body Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Throttle Body Assembly Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) .
3. Remove the radiator hose from the water outlet. Refer to «Radiator Inlet Hose Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/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 (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. For the LLT engine, install the throttle body. Refer to «Throttle Body Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Throttle Body Assembly Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) .
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

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

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the generator drive belt. Refer to «Water Pump and Generator Belt Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-repair-instructions-on-vehicle-1-of-2) .
3. Use the EN 46104 (1) in order to retain the water pump pulley. See «Special Tools»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-repair-instructions-on-vehicle-1-of-2) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-repair-instructions) .
2. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
3. Remove the supercharger belt. Refer to «Supercharger Belt Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
4. Remove the drive belt tensioner. Refer to «Drive Belt Tensioner Replacement - Accessory»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
5. Remove the drive belt idler pulley. Refer to «Drive Belt Idler Pulley Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
6. Remove the supercharger belt idler pulley bracket. Refer to «Supercharger Belt Idler Pulley Bracket Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
7. Disconnect the radiator inlet hose from the water pump. Refer to «Radiator Inlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Disconnect the radiator outlet hose from the water pump. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Disconnect the heater inlet hose/pipe and heater outlet hose/pipe. Refer to «Heater Inlet Hose/Pipe and Heater Outlet Hose/Pipe Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
10. Remove the supercharger belt tensioner bracket. Refer to «Supercharger Belt Tensioner Bracket Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
11. Remove the water pump to block bolts (1).
12. Reposition pump to access oil cooler hose. Remove the clamp and pull pump away from the hose. Refer to «Engine Oil Cooler Hose/Pipe Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
13. Remove the water pump (2).

1. Install the water pump to the engine block and tighten the bolts to 30 N.m (22 lb ft).
2. Install the supercharger belt tensioner bracket. Refer to «Supercharger Belt Tensioner Bracket Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
3. Install the heater inlet hose/pipe and heater outlet hose/pipe. Refer to «Heater Inlet Hose/Pipe and Heater Outlet Hose/Pipe Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Install the supercharger belt idler pulley bracket. Refer to «Supercharger Belt Idler Pulley Bracket Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
5. Install the drive belt idler pulley. Refer to «Drive Belt Idler Pulley Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
6. Install the drive belt tensioner. Refer to «Drive Belt Tensioner Replacement - Accessory»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
7. Install the supercharger belt. Refer to «Supercharger Belt Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-62l-repair-instructions-on-vehicle) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
9. install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-repair-instructions) .

Scheme 20

Scheme 21

Scheme 22

Radiator Replacement (Heavy Duty Cooling)

Special Tools

1. J 38185 Hose Clamp Pliers. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 38778 Door Trim Pad Clip Remover

1. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the engine coolant fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Shroud Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the front fascia. Refer to «Front Bumper Fascia Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia)
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
5. Remove the lower condenser mounting bolts.
6. Remove the upper condenser mounting bolts.
7. Remove the transmission oil cooler mounting bolts.
8. Disconnect the lower retainer pins of the side air baffle from the radiator.
9. Lower the vehicle.
10. Remove the radiator support bracket bolts.
11. Remove the radiator support brackets.
12. Use J 38778 to remove the radiator/condenser upper support.
13. Use J 38185 to disconnect the surge tank inlet hose from the radiator. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) . Reposition the hose aside.
14. Using J 38185 disengage tension on the radiator inlet hose clamp and disconnect the hose from the radiator. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
15. Using J 38185 disengage tension on the radiator outlet hose clamp and disconnect the hose from the radiator. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
16. Disconnect the upper retainer pins on the side air baffle from the radiator.
17. 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/cts/ii-2007-2014/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/cts/ii-2007-2014/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/cts/ii-2007-2014/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 engine coolant fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Shroud Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
16. Install the front fascia. Refer to «Front Bumper Fascia Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia)
17. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Radiator Replacement (Standard Duty Cooling)

Special Tools

1. J 38185 Hose Clamp Pliers. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
2. J 38778 Door Trim Pad Clip Remover

1. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the electric cooling fan assembly. Refer to «Engine Coolant Fan Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
4. Remove the lower condenser mounting bolts.
5. Remove the upper condenser mounting bolts.
6. Disconnect the lower retainer pins of the side air baffle from the radiator.
7. Lower the vehicle.
8. Remove the radiator support bracket bolts.
9. Remove the radiator support brackets.
10. Use J 38778 to remove the radiator/condenser upper support.
11. Use J 38185 to disconnect the surge tank inlet hose from the radiator. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) . Reposition the hose aside.
12. Using J 38185 disengage tension on the radiator inlet hose clamp and disconnect the hose from the radiator. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
13. Using J 38185 disengage tension on the radiator outlet hose clamp and disconnect the hose from the radiator. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
14. Disconnect the upper retainer pins on the side air baffle from the radiator.
15. 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/cts/ii-2007-2014/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/cts/ii-2007-2014/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/cts/ii-2007-2014/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 upper condenser mounting bolts and tighten to 5.4 N.m (48 lb in).
12. Install the lower condenser mounting bolts and tighten to 5.4 N.m (48 lb in).
13. Lower the vehicle.
14. Install the electric cooling fan assembly. Refer to «Engine Coolant Fan Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Engine Coolant Fan Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
15. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Scheme 23

Scheme 24

1. Turn the ignition OFF.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#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.

Scheme 25

Scheme 26

Scheme 27

Scheme 28

System Overview

The engine cooling fan system consists of one electrical cooling fan, a serviceable resistor module mounted in the cooling fan shroud, and three fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate the fan at low, medium, or high speeds, depending on cooling requirements. The cooling fan and fan relays receive battery voltage from the underhood fuse block. The ground path for the operation of the cooling fan is provided at G104.

Low Speed Operation

The ECM energizes the fan 1 relay by grounding the fan 1 relay control circuit. The fan 1 relay coil closes the relay contacts to supply battery voltage from the FAN 1 fuse through the high resistance circuit of the cooling fan resistor module, and the fan motor supply voltage circuit to operate the cooling fan at low speed.

Medium Speed Operation

The ECM energizes the fan 2 and S/P relays by grounding the fan 2 relay control circuit. The energized fan 2 relay coil closes the relay contacts to supply battery voltage from the FAN 2 fuse. The voltage passes through the medium resistance circuit of the cooling fan resistor module, and the fan motor voltage supply circuit to operate the cooling fan at medium speed. At the same time, the energized S/P relay coil switches the dual pole contact position to prevent voltage from passing through the S/P relay to the low resistance circuit of the resistor module.

High Speed Operation

The ECM energizes the fan 1 relay by grounding the fan 1 relay control circuit. The ECM also energizes the high speed fan 2 relay and the S/P fan relay by grounding the fan 2 relay control circuit. The energized S/P fan relay coil switches the dual pole contact position, allowing voltage from the FAN 1 fuse to pass through the S/P relay to the low resistance circuit of the cooling fan resistor module, and the motor voltage supply circuit to operate the cooling fan at high speed. The energized fan 2 relay also provides voltage from the FAN 2 fuse through the medium resistance circuit of the cooling fan resistor module. This provides a back up to high speed operation if a condition exists in the high speed cooling fan circuit.

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, depending on cooling requirements. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104 and G101.

The ECM supplies the ground path for the low speed fan 1 relay through the fan 1 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 right cooling fan. The ground path for the right cooling fan is through the cooling fan S/P relay and the left cooling fan. The result is a series circuit with both fans running at low speed.

The ECM supplies the ground path for the fan 1 relay through the fan 1 relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan 2 relay and the fan S/P relay through the fan 2 relay control circuit. This energizes the fan S/P relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time, the fan 2 relay coil is energized closing the relay contacts, and provides battery positive voltage from the FAN 2 fuse on the cooling fan motor supply voltage circuit, to the left 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 - One Fan System

The engine cooling fan system consists of one electrical cooling fan, a serviceable resistor module mounted in the cooling fan shroud, and three fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate the fan at low, medium, or high speeds, depending on cooling requirements. The cooling fan and fan relays receive battery voltage from the underhood fuse block. The ground path for the operation of the cooling fan is provided at G104.

During low speed operation, the ECM energizes the fan 1 relay by grounding the fan 1 relay control circuit. The fan 1 relay coil closes the relay contacts to supply battery voltage from the FAN 1 fuse through the high resistance circuit of the cooling fan resistor module, and the fan motor supply voltage circuit to operate the cooling fan at low speed.

During medium speed operation, the ECM energizes the fan 2 and S/P relays by grounding the fan 2 relay control circuit. The energized fan 2 relay coil closes the relay contacts to supply battery voltage from the FAN 2 fuse. The voltage passes through the medium resistance circuit of the cooling fan resistor module, and the fan motor voltage supply circuit to operate the cooling fan at medium speed. At the same time, the energized S/P relay coil switches the dual pole contact position to prevent voltage from passing through the S/P relay to the low resistance circuit of the resistor module.

During high speed operation, the ECM energizes the fan 1 relay by grounding the fan 1 relay control circuit. The ECM also energizes the high speed fan 2 relay and the S/P fan relay by grounding the fan 2 relay control circuit. The energized S/P fan relay coil switches the dual pole contact position, allowing voltage from the FAN 1 fuse to pass through the S/P relay to the low resistance circuit of the cooling fan resistor module, and the motor voltage supply circuit to operate the cooling fan at high speed. The energized fan 2 relay also provides voltage from the FAN 2 fuse through the medium resistance circuit of the cooling fan resistor module. This provides a back up to high speed operation if a condition exists in the high speed cooling fan circuit.

Coolant Warning Messages

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

Engine hot - A/C OFF, will be displayed if coolant temperature is above 117°C (243°F). For imports 115°C (239°F).

Engine coolant hot - idle engine, will be displayed if coolant temperature is above 118°C (245°F).

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 the 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.

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.

Transmission Oil Cooler (Without V03)

The transmission oil cooler is a heat exchanger located in the end tank of the radiator. The transmission oil temperature is regulated by the temperature of the coolant leaving the radiator and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the cooler and back to the transmission.

Transmission Oil Cooler (With V03)

There are two transmission oil coolers in a series in the heavy duty transmission oil cooler system. The initial transmission oil cooler is a heat exchanger located in the end tank of the radiator. The transmission oil temperature is partially regulated by the temperature of the coolant leaving the radiator and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the end tank cooler. The oil out of the cooler is plumbed to an air-to-oil cooler in between the A/C condenser and radiator. This cooler provides additional cooling for heavy duty trailering. The transmission oil is then directed back to the transmission.

Power Steering Oil Cooler

The power steering oil cooler is located on the rear side of the front bumper impact bar. This cooler transfers heat from the power steering system to the air passing through the grille. The cooler uses constant tension clamps on the hose connections to the cooler.

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

Engine hot - A/C OFF, will be displayed if coolant temperature is above 117°C (243°F). For imports 115°C (239°F).

Engine coolant hot - idle engine, will be displayed if coolant temperature is above 118°C (245°F).

Engine overheated - stop engine, will be displayed if coolant temperature is above 123°C (253°F).

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 the class 2 message, to prevent the message from being displayed due to coolant sloshing in the surge tank.

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 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.

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-Two Fan System

The transmission oil cooler is a heat exchanger located in the bottom tank of the radiator. The transmission oil temperature is regulated by the temperature of the coolant leaving the radiator and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the cooler and back to the transmission.

Transmission Oil Cooler-Three Fan System

There are two transmission oil coolers in a series in the heavy duty transmission oil cooler system. The initial transmission oil cooler is a heat exchanger located in the bottom tank of the radiator. The transmission oil temperature is partially regulated by the temperature of the coolant leaving the radiator and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the cooler. The oil out of the cooler is plumbed to an air-to-oil cooler in front of the A/C condenser. This cooler provides additional cooling for heavy duty trailering. The transmission oil is then directed back to the transmission.

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 24460-01 Cooling System Pressure Tester J 24731 Tempil Stick J 26568 Coolant and Battery Fluid Tester J 28410 Gasket Remover (Aluminum Components) J 37097-A Heater Hose Clamp Tool J 38185 Hose Clamp Pliers J 42401 Radiator Cap and Surge tank Tester Adapter J 44827 Transmission Cooler Quick Disconnect

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Relay Replacement (Attached to Wire Harness)
• Coolant in Combustion Chamber
• Coolant in Engine Oil
• Instrument Cluster Replacement (Left Hand Drive)
• Drive Belt Tensioner Diagnosis
• Drive Belt Tensioner Diagnosis
• Moving Parts and Hot Surfaces Warning
• Approximate Fluid Capacities
• Heater Core Replacement
• Engine Will Not Crank - Crankshaft Will Not Rotate
• Lower Engine Noise, Regardless of Engine Speed
• Cylinder Leakage Test
• Lifting and Jacking the Vehicle
• Front Air Deflector Replacement
• Fastener Caution
• Front Compartment Sight Shields Replacement
• Intake Manifold Cover Replacement - Rear
• Air Cleaner Assembly Replacement (LF1)
• Windshield Wiper Transmission Replacement
• Air Cleaner Resonator Outlet Duct Replacement
• Component Fastener Tightening Caution
• Intake Manifold Replacement
• Air Cleaner Assembly Replacement (LLT)
• Tire and Wheel Removal and Installation
• DTC P0480 or P0481 (V8 or LF1 with/Dual Fan)
• Thermostat Diagnosis (LF1, LLT)
• Thermostat Diagnosis (LSA)
• Engine Overheating (LF1, LLT)
• Engine Overheating (LSA)
• Loss of Coolant
• Engine Fails To Reach Normal Operating Temperature
• Flushing (Powertrain)
• Flushing (Charge Air Cooling)
• Radiator Replacement (Heavy Duty Cooling)
• Radiator Replacement (Standard Duty Cooling)
• Cooling System Draining and Filling (GE 47716 LSA)
• Cooling System Leak Testing
• Pressure Cap Testing
• Charge Air Cooling System Draining and Filling (Static)