Engine Cooling System Chevrolet Equinox II

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 1

Scheme 2

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

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. The ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. Each 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.

Conditions for Running the DTC

1. The ignition voltage is greater than 11 volts.
2. The ECM driver transitions from ON to OFF or from OFF to ON.
3. DTCs P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met.

Conditions for Setting the DTC

The commanded state of the ECM driver and the actual state of the control circuit do not match for greater than 5 seconds.

Action Taken When the DTC Sets

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

Conditions for Clearing the MIL/DTC

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

Diagnostic Aids

1. The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
2. 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 1 fan at a high speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed

Reference Information

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/equinox/ii-2009-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/equinox/ii-2009-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (3.0L) , Cooling Fan Description and Operation (2.4L)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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. Engine operating, command the cooling fans ON and OFF at high speed. Verify both fans operate as commanded.
2. Engine operating, observe the DTC information with a scan tool. DTC P0480, P0481, P0691, P0692, P0693, or P0694 should not set.
3. 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 86 KR20D cooling fan high speed relay terminal 86 KR20E cooling fan speed control relay terminal 85 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 85 KR20D cooling fan high speed relay terminal 85 KR20E cooling fan speed control relay terminal 86 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 a short to voltage. If the circuit tests normal, replace the K20 engine control module.
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 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 the KR20E cooling fan speed control relay for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan speed control 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 Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/chevrolet/equinox/ii-2009-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/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 is composed of one cooling fan, 2 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. Each 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 ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.

1. The ignition voltage is greater than 11 volts.
2. The ECM driver transitions from ON to OFF or from OFF to ON.
3. DTC P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met.

The commanded state of the ECM driver and the actual state of the control circuit do not match for greater than 5 seconds.

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 ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
2. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at low speed Cooling Fan Relay 2 operates the fan at a high speed
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

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/equinox/ii-2009-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/equinox/ii-2009-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (3.0L) , Cooling Fan Description and Operation (2.4L)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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 appropriate Cooling Fan Relay ON and OFF with a scan tool. You should hear the relay click when commanded ON and OFF.
2. Engine operating, observe the DTC information with a scan tool. DTC P0480, P0481, P0691, P0692, P0693, or P0694 should not set.
3. 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 both 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 86 KR20D cooling fan high speed relay terminal 86 If the test lamp does not illuminate, test the relay coil ignition circuit for or an open/high resistance.
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 85 KR20D cooling fan high speed 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 engine control module.
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 a short to voltage. If the circuit tests normal, replace the K20 engine control module.
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. 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 (Within an Electrical Center)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/chevrolet/equinox/ii-2009-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses the engine coolant temperature sensor to monitor the engine for an over-temperature condition. This condition occurs when the coolant temperature is above a calibrated value. The ECM will alternately disable 2 groups of cylinders by turning OFF the fuel injectors. By switching between the 2 groups 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 P1258 runs continuously once the conditions above have been met.

The ECM detects that engine coolant temperature is warmer than 131°C (268°F) for greater than 2 seconds.

1. DTC P1258 is a Type A DTC.
2. The engine will operate in the Overheated Engine Protection Operating Mode.
3. The IP will illuminate the coolant temperature indicator lamp and the driver information center (DIC), if equipped, may display a message.
4. If the protection mode is active and an ECT sensor DTC sets, the protection mode will remain active at the start of the next drive cycle until the ECT sensor DTC runs and passes.

DTC P1258 is a Type A DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

1. «Cooling Fan Description and Operation (3.0L)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-fan-description-and-operation-30l) , «Cooling Fan Description and Operation (2.4L)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-fan-description-and-operation-24l)
2. «Instrument Cluster Description and Operation»(/chevrolet/equinox/ii-2009-2015/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
3. «Indicator/Warning Message Description and Operation»(/chevrolet/equinox/ii-2009-2015/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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

Engine Control Module Scan Tool Information (LFX or LFW) , Engine Control Module Scan Tool Information (LEA) for scan tool information

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

1. Observe the engine coolant level. The engine coolant level should be within the operating range. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Ensure that the vehicle has the correct engine coolant with correct concentration and is not old, contaminated, or contains additives. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
3. Inspect the cooling system for the following: Leaks Kinked or pinched hoses, especially at the radiator Loose, missing, or damaged radiator air seals or deflectors Air flow obstructions or bent fins at the radiator or the A/C condenser-Refer to «Symptoms - Engine Cooling»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Command the cooling fans ON and OFF, low and high speed. The engine cooling fans should turn ON and OFF with each command. If the cooling fans do not function as indicated, refer to «Cooling Fan Inoperative (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling Fan Inoperative (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Test the thermostat for correct operation. Refer to «Thermostat Diagnosis»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis) .
2. Test the engine cooling system for overheating. Refer to «Engine Overheating»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating) .
3. Inspect the water pump and coolant flow for correct operation. Refer to «Water Pump Cleaning and Inspection»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-30l-repair-instructions-off-vehicle) .
4. Inspect the engine mechanical for worn, leaking, cracked cylinder heads or engine block. Refer to «Coolant in Engine Oil»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-30l-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»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) and verify all of the following items: Engine control module (ECM) and indicator lamp are operating correctly. There are no diagnostic trouble codes (DTCs) 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 (3.0L) , Cooling Fan Description and Operation (2.4L) , and Cooling System Description and Operation .

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

1. Ensure that the control module grounds are clean, tight, and correctly located.
2. Inspect cooling system hoses and pipes for splits, kinks, and improper connections. Inspect thoroughly for any type of leak or restriction.
3. Inspect for a dirty or restricted radiator or 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 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. Water intrusion in connectors, terminals, or components
2. Poor 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 temperatures
7. High or low engine coolant temperatures
8. High underhood temperatures
9. Heat build up in components or circuits 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, or 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 (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling Fan Always On (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Cooling Fan Inoperative (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling Fan Inoperative (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Overheating»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating)
4. «Loss of Coolant»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant)
5. «Thermostat Diagnosis»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis)
6. «Engine Fails To Reach Normal Operating Temperature»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-fails-to-reach-normal-operating)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/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 is composed of one cooling fan, 2 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.

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 operates the fan at a high speed
2. Certain resistance conditions with IAT or ECT sensors may cause unwarranted cooling fan activation. If the ECM is commanding the cooling fans ON for no apparent reason and without any component or system DTCs set, the IAT or ECT sensor may be skewed. If this condition is suspected, refer to the temperature versus resistance tables listed below. «Temperature Versus Resistance (Engine Coolant Temperature Sensor)»(/chevrolet/equinox/ii-2009-2015/remont/testing-diagnostics/#engine-controlsfuel-24l-specifications__temperature-versus-resistance-engine-coolant-temperature) «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitatchi Sensor)»(/chevrolet/equinox/ii-2009-2015/remont/testing-diagnostics/#engine-controlsfuel-24l-specifications__temperature-versus-resistance-intake-air)

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/equinox/ii-2009-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/equinox/ii-2009-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (3.0L) , Cooling Fan Description and Operation (2.4L)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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 should not set. If a DTC is set, refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition ON, observe the scan tool parameters listed below. Verify that both parameters display OFF. Cooling Fan Relay 1 Command Cooling Fan Relays 2 Command
3. Ignition ON, observe that the fan is not activated.

1. Ignition OFF, disconnect the KR20 Cooling Fan Relays 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 of the engine cooling fan. If the fan is 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. 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 range, replace the KR20 cooling fan relay.
4. Install a 20 A fused jumper wire between relay terminal 85 and B+. 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 (Within an Electrical Center) , Relay Replacement (Attached to Wire Harness)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/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 the 1 fan at a high speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. 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

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/equinox/ii-2009-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/equinox/ii-2009-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (3.0L) , Cooling Fan Description and Operation (2.4L)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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 «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Ignition ON, observe the scan tool Cooling Fan Relay 1 and Cooling Fan Relays 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 of the appropriate cooling fan. 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 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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/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 is composed of one cooling fan, 2 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. Each 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 ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.

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 the fan at a high speed
2. 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

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/equinox/ii-2009-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/equinox/ii-2009-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (3.0L) , Cooling Fan Description and Operation (2.4L)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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 should not set. If a DTC is set, refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Command the cooling fan ON and OFF at Low and High speed with a scan tool. The cooling fan should turn ON and OFF in each of the commanded states.

1. Ignition OFF, disconnect the G10 cooling fan harness connector.
2. Disconnect the R10 cooling fan resistor harness connector.
3. Test for less than 1.0 ohms between the G10 cooling fan ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, connect a test lamp between ground and the G10 cooling fan circuit terminal 1. Command the cooling fan ON at high speed with a scan tool. The test lamp should illuminate as commanded. If the test lamp does not illuminate, test the high speed relay controlled output circuit and B+ supply circuit for a short to ground or for an open/high resistance. If the circuits test normal and the B+ fuse is open, test or replace the G10 cooling fan motor. If the circuits and B+ fuse test normal, test or replace the KR20D fan relay.
5. Connect a test lamp between the R10 fan resistor circuit terminal 1 and ground. Command the cooling fan ON at low speed with a scan tool. The test lamp should illuminate. If the test lamp does not illuminate, test the low speed relay controlled output circuit and B+ supply circuit for a short to ground or for an open/high resistance. If the circuits test normal and the B+ fuse is OK, test or replace the KR20C fan relay. If necessary, replace the B+ fuse.
6. Ignition OFF, connect the R10 fan resistor harness connector.
7. Ignition ON, connect a test lamp between ground and the G10 cooling fan circuit terminal 1. Command the cooling fan ON at low speed with a scan tool. The test lamp should illuminate as commanded. If the test lamp does not illuminate, test the low speed relay controlled output circuit for a short to ground or an open/high resistance between R10 resistor terminal 2 and the J110 splice. If the circuit tests normal, test or replace the R10 cooling fan resistor.
8. If all of the circuits and components test normal, test or replace the G10 cooling fan motor.

KR20 Cooling Fan Relay

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110ohms 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 relay.
4. Install a 20 A fused jumper wire between relay terminal 86 and B+. Install a jumper wire between relay terminal 85 and ground. Test for less than 2ohms between terminals 30 and 87. If greater than the specified range, replace the relay.

G10 Engine Cooling Fan

1. Ignition OFF, disconnect the harness connector at the G10 engine cooling fan.
2. Connect a jumper wire between ground and the G10 ground circuit terminal 2.
3. Connect a 30 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 not operate, replace the G10 engine cooling fan.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Resistor Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Coolant Fan Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Fan Replacement (LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/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 the 1 fan at a high speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. 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

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/equinox/ii-2009-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/equinox/ii-2009-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (3.0L) , Cooling Fan Description and Operation (2.4L)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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. Verify that DTC P0480, P0481, P0691, P0692, P0693, or P0694 is not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
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 30 A fused jumper between the KR20E cooling fan speed control relay switch circuit terminal 30 and the ground circuit terminal 87. This completes the left side fan ground circuit. Leave this jumper in place for the remainder of this procedure.
3. Ignition ON, verify that a test lamp illuminates between ground and the relay switched ignition circuit terminal listed below: KR20C cooling fan low speed relay terminal 87 KR20D cooling fan high speed 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 30 A fused jumper between the KR20 cooling fan relay circuit terminals listed below. Verify the appropriate fan is activated. KR20D cooling fan high speed relay terminals 87 and 30 KR20C cooling fan low speed 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 cooling fan speed control 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 cooling fan speed control 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 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 the KR20E cooling fan speed control relay for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the KR20E cooling fan speed control 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.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Fan Replacement (LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Overheating

Engine Overheating

Loss of Coolant

Loss of Coolant

Thermostat Diagnosis

Special Tools

J 24731 Tempil Stick

Use one of the following procedures in testing for a malfunctioning thermostat.

Thermostat Test Procedure Using Tempil Sticks

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. Take a 87°C (188°F) tempil stick or a 97°C (206°F) tempil stick and rub it on the thermostat housing. Temperature sticks can be used to determine a thermostat's operating range.

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

Thermostat Test Procedure Using Glycol

Inspect the operation of the thermostat by hanging the thermostat on a hook in a 50/50 percent solution of DEX-COOL® and clean drinkable water.

In order to inspect if the thermostat valve is opening properly, perform the following test

1. Completely submerge the thermostat in the glycol solution. The solution should be 11°C (22°F) above the temperature indicated on the thermostat valve.
2. Thoroughly agitate the solution. Under these conditions, the thermostat valve should open.

In order to inspect if the thermostat valve is closing properly, perform the following test

1. Completely submerge the thermostat in a glycol solution. The solution should be 6°C (10°F) below the temperature indicated on the thermostat valve.
2. Thoroughly agitate the solution. Under these conditions, the thermostat valve should close completely.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/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»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/equinox/ii-2009-2015/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 (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Coolant Heater Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Coolant Heater Cord Replacement (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Coolant Heater Cord Replacement (LAF)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Fails To Reach Normal Operating Temperature

Engine Fails To Reach Normal Operating Temperature

Pressure Cap Testing

Special Tools

1. J 24460-01 Cooling System Pressure Tester
2. J 42401-1 Radiator Cap / Surge Tank Test Adapter

1. Remove the pressure cap.
2. Wash the pressure cap sealing surface with water.
3. Use the J 24460-01 Cooling System Pressure Tester (1) with J 42401-1 Radiator Cap / Surge Tank Test Adapter (2) in order to test the pressure cap.
4. Test the pressure cap for the following conditions: Pressure release when the J 24460-01 Cooling System Pressure Tester exceeds the pressure rating of the pressure cap. 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
2. J 42401 Radiator Cap/Surge Tank Test Adapter

1. Remove the pressure cap.
2. Test the operation of the pressure cap. Refer to «Pressure Cap Testing»(/chevrolet/equinox/ii-2009-2015/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 Cooling System Pressure Tester with the J 42401 Radiator Cap/Surge Tank Test Adapter in order to apply pressure to the 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.

Cooling System Draining and Filling (Static LF1 or LFW)

Special Tools

J 26568 Coolant and Battery Fluid Tester

Draining Procedure

1. Remove the coolant pressure cap from the radiator surge tank.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#general-information) .
3. Place a drain pan under the drain cock.
4. Loosen the radiator drain cock.
5. Drain the cooling system.
6. Lower the vehicle.
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»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__flushing) .

Filling Procedure

1. Raise and support the vehicle.
2. Tighten the radiator drain cock to 2 N.m (18 lb in).
3. Lower the vehicle.
4. Slowly fill the radiator with a 50/50 coolant mixture until the coolant level reaches the base of the radiator surge tank. Refer to «Approximate Fluid Capacities»(/chevrolet/equinox/ii-2009-2015/remont/lubrication-system/#maintenance-and-lubrication__approximate-fluid-capacities) .
5. Allow 30 seconds for the coolant level to stabilize and continue to fill the coolant filler neck until the level stabilizes for at least 2 minutes.
6. Start the engine and allow to the engine to idle in PARK or NEUTRAL with the parking brake engaged.
7. Slowly fill the coolant mixture until the level stabilizes at the base of the radiator surge tank.
8. Install the coolant pressure cap.
9. Raise the engine RPM to 2500 RPM for 30-40 seconds.
10. Shut the engine OFF.
11. Allow the engine to cool, remove coolant fill cap and repeat steps 4-10 until the coolant level has completely stabilized within the radiator surge tank.
12. Inspect the concentration of the engine coolant using the J 26568 Coolant and Battery Fluid Tester.
13. Inspect and if necessary, fill the coolant reservoir bottle as necessary.
14. Rinse away any excess coolant from the engine and the engine compartment
15. Inspect the cooling system for leaks.
16. Top off the radiator surge tank if necessary.

Cooling System Draining and Filling (GE 47716)

Special Tools

1. J 26568 Coolant and Battery Fluid Tester
2. J 42401 Radiator Cap and Surge Tank Test Adapter
3. GE-47716 Vac N Fill Coolant Refill Tool

1. Remove the coolant pressure cap.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#general-information) .
3. Place a drain pan under the drain cock.
4. Remove the radiator drain cock.
5. Drain the cooling system.
6. Lower the vehicle.
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»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__flushing) .

Vac-N-Fill Procedure

1. Install the J 42401 Radiator Cap and Surge Tank Test Adapter onto the coolant surge tank.
2. Attach the Vac N Fill cap to the J 42401 Radiator Cap and Surge Tank Test 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»(/chevrolet/equinox/ii-2009-2015/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 Radiator Cap and Surge Tank Test Adapter.
20. Remove the J 42401 Radiator Cap and Surge Tank Test 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.

Cooling System Draining and Filling (Static LAF or LEA)

Special Tools

J 26568 Coolant and Battery Fluid Tester

1. Remove the coolant pressure cap from the radiator surge tank.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#general-information) .
3. Place a drain pan under the drain cock.
4. Loosen the radiator drain cock.
5. Drain the cooling system.
6. If a complete block drain is required, place a drain pan under the water pump drain.
7. Remove the water pump drain plug.
8. Drain the cooling system.
9. Inspect the coolant.
10. 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»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__flushing) .

1. Tighten the radiator drain cock to 2 N.m (18 lb in).
2. Install the water pump drain plug and tighten to 10 N.m (89 lb in) if removed during the draining process.
3. Lower the vehicle.
4. Remove radiator inlet hose at the engine. Refer to «Radiator Inlet Hose Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__radiator-inlet-hose-replacement-lea) , «Radiator Inlet Hose Replacement (LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__radiator-inlet-hose-replacement-lf1-or)
5. Slowly add mixture of 50/50 DEX-COOL antifreeze and clean, drinkable water to the engine and radiator. Fill the cooling system as indicated below: When the engine block is not drained, add 1.75 liters (1.85 qts) to the radiator through the radiator inlet hose. When the engine block is drained, add 2.0 liters (2.1 qts) to the engine, then add 1.75 liters (1.85 qts) to the radiator through the radiator inlet hose.
6. Install the radiator inlet hose at the engine. Refer to «Radiator Inlet Hose Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__radiator-inlet-hose-replacement-lea) , «Radiator Inlet Hose Replacement (LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__radiator-inlet-hose-replacement-lf1-or)
7. Slowly add mixture of 50/50 DEX-COOL antifreeze and clean, drinkable water to the surge tank until the coolant level reaches the base of the radiator surge tank. Refer to «Approximate Fluid Capacities»(/chevrolet/equinox/ii-2009-2015/remont/lubrication-system/#maintenance-and-lubrication__approximate-fluid-capacities)
8. Start the engine and check for leaks.
9. Run the engine and cycle the vehicle from idle to 3, 000 RPM in 30 second intervals until the engine cooling fan comes ON, the engine cooling fan turns ON at approximately 102°C (216°F). Repeat this process twice before the engine is turned OFF.
10. Return the engine to idle, and idle for 30 seconds, then turn the engine OFF.
11. Allow the vehicle to cool, before adding additional coolant.
12. Add additional coolant to the surge tank until the level is approximately 13 mm (0.5 in) above the surge tank seam.
13. Install the coolant surge tank cap.

Flushing

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

When the cooling system becomes contaminated, the cooling system should be flushed thoroughly to remove the contaminants before the engine is seriously damaged.

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Remove the surge tank. Refer to «Radiator Surge Tank Replacement»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Clean and flush the surge tank with clean, drinkable water.
4. Install the surge tank. Refer to «Radiator Surge Tank Replacement»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Follow the drain and fill procedure using only clean, drinkable water. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
6. Run the engine for 20 minutes.
7. Stop the engine.
8. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
9. Repeat the procedure if necessary, until the fluid is nearly colorless.
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

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 3

Radiator Surge Tank Replacement

Radiator Inlet Hose Replacement (LF1 or LFW)

Special Tools

J 38185 Hose Clamp Pliers

Removal Procedure

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-30l-repair-instructions-on-vehicle) .
3. Disengage tension on the radiator inlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
4. Remove the radiator inlet hose (2) from the radiator.
5. Disengage tension on the radiator inlet hose clamp (1) at the engine using J 38185 Hose Clamp Pliers.
6. Remove the radiator inlet hose (2) from the engine.
7. Remove the radiator inlet hose from the vehicle.

Installation Procedure

1. Install radiator inlet hose to the vehicle.
2. Install the radiator inlet hose (2) to the engine.
3. Engage tension on the radiator inlet hose clamp (1) at the engine using J 38185 Hose Clamp Pliers.
4. Install the radiator inlet hose (2) to the radiator.
5. Engage tension on the radiator inlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
6. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-30l-repair-instructions-on-vehicle) .
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Radiator Inlet Hose Replacement (LEA)

Special Tools

J 38185 Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-24l) .
3. Disengage tension on the radiator inlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
4. Remove the radiator inlet hose (2) from the radiator.
5. Disengage tension on the radiator inlet hose clamp (1) at the engine using J 38185 Hose Clamp Pliers.
6. Remove the radiator inlet hose (2) from the engine.
7. Remove the radiator inlet hose from the vehicle.

1. Install radiator inlet hose to the vehicle.
2. Install the radiator inlet hose (2) to the engine.
3. Engage tension on the radiator inlet hose clamp (1) at the engine using J 38185 Hose Clamp Pliers.
4. Install the radiator inlet hose (2) to the radiator.
5. Engage tension on the radiator inlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
6. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-24l) .
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Radiator Outlet Hose Replacement (LF1 or LFW)

Special Tools

J 38185 Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#general-information) .
3. Disengage tension on the radiator outlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
4. Remove the radiator outlet hose (2) from the radiator.
5. Disengage tension on the radiator outlet hose clamp (1) at the engine using J 38185 Hose Clamp Pliers.
6. Remove the radiator outlet hose (2) from the engine.
7. Remove the radiator outlet hose from the vehicle.

1. Install radiator outlet hose to the vehicle.
2. Install the radiator outlet hose (2) to the engine.
3. Engage tension on the radiator outlet hose clamp (1) at the engine using J 38185 Hose Clamp Pliers.
4. Install the radiator outlet hose (2) to the radiator.
5. Engage tension on the radiator outlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
6. Lower the vehicle.
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Radiator Outlet Hose Replacement (LEA)

Special Tools

J 38185 Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#general-information) .
3. Disengage tension on the radiator outlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
4. Remove the radiator outlet hose (2) from the radiator.
5. Remove radiator outlet hose bracket retainer (1).
6. Disengage tension on the radiator outlet hose clamp (2) at the thermostat housing using J 38185 Hose Clamp Pliers.
7. Remove the radiator outlet hose (4) from the thermostat housing.
8. Disengage tension on the radiator outlet hose clamp (3) at the engine oil cooler using J 38185 Hose Clamp Pliers.
9. Remove the radiator outlet hose (4) from the engine oil cooler.
10. Remove the radiator outlet hose from the vehicle.

1. Install radiator outlet hose to the vehicle.
2. Install the radiator outlet hose (4) to the engine oil cooler.
3. Engage tension on the radiator outlet hose clamp (3) at the engine oil cooler using J 38185 Hose Clamp Pliers.
4. Install the radiator outlet hose (4) to the thermostat housing.
5. Engage tension on the radiator outlet hose clamp (2) at the thermostat housing using J 38185 Hose Clamp Pliers.
6. Install radiator outlet hose bracket retainer (1).
7. Install the radiator outlet hose (2) to the radiator.
8. Engage tension on the radiator outlet hose clamp (1) at the radiator using J 38185 Hose Clamp Pliers.
9. Lower the vehicle.
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Scheme 4

Engine Coolant Fan Replacement (LF1 or LFW)

Scheme 5

Engine Coolant Fan Replacement (LEA)

Scheme 6

Engine Coolant Fan Resistor Replacement (LEA)

Scheme 7

Engine Coolant Thermostat Housing Replacement (LFW)

1. Drain the coolant from the engine block at the water pump drain. After the coolant has drained, tighten the drain bolt.
2. Lower the vehicle.
3. Disconnect the engine wiring harness electrical connector (1) from the engine coolant temperature (ECT) sensor.
4. Remove the heated oxygen sensor (HO2S) electrical connector rosebud clip from the thermostat housing.
5. Reposition the radiator outlet hose clamp (2) at the thermostat housing.
6. Remove the radiator outlet hose retainer (1) from the fuel pump cover.
7. Remove the surge tank hose (1) from the thermostat housing.
8. Remove the exhaust heat shield studs (2).
9. Remove the exhaust heat shield.
10. Remove the HVAC heater inlet hose (2) from the thermostat housing.
11. Remove the HVAC heater outlet hose (2) from the thermostat housing.
12. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/ii-2009-2015/remont/ignition-switchsteering-lock/#general-information) .
13. Remove the ECT sensor, if necessary.
14. Remove the thermostat housing bolts (1).
15. Remove the thermostat housing (3) from the vehicle.
16. Remove the water transfer pipe from the thermostat housing, if necessary.
17. Remove and discard the water transfer pipe O-ring seals (2).
18. Remove the thermostat cover bolts (1) and cover (2), if necessary.
19. Remove the thermostat (3), if necessary.
20. Remove and discard the thermostat cover O-ring seal, if necessary.
21. Remove all debris and thread sealant from the engine coolant temperature (ECT) sensor and bolt holes if the housing is being re-used.

1. Install a NEW thermostat cover O-ring seal into the recess groove.
2. Install the thermostat (3), if necessary.
3. Install the thermostat cover bolts (1), if necessary and tighten to 10 N.m (89 lb in).
4. Install a NEW thermostat housing to engine gasket onto the thermostat housing.
5. Load the thermostat housing assembly into position.
6. Install NEW O-ring seals onto the water feed pipe.
7. Install the water feed pipe into the thermostat housing aligning locator tab.
8. Align the water pipe to water pump.
9. Seat the water feed O-ring seal by pushing inward toward the water pump. Take care not to tear or damage the O-ring.
10. Position the thermostat housing (3) against the engine.
11. Install the thermostat housing bolts (1) and tighten to 10 N.m (89 lb in).
12. If reinstalling the old sensor, coat the threads with sealant. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-24l__adhesives-fluids-lubricants-and-sealers) .
13. Install the ECT sensor, if necessary and tighten to 20 N.m (15 lb ft).
14. Lower the vehicle.
15. Install the HVAC heater inlet hose (2) to the thermostat housing.
16. Install the HVAC heater outlet hose (2) to the thermostat housing.
17. Install the surge tank hose (1) onto the thermostat housing.
18. Install the exhaust heat shield. Refer to «Exhaust Manifold Heat Shield Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system) .
19. Install the radiator outlet hose (2) to the thermostat housing.
20. Install the radiator outlet hose retainer bracket (1) onto the fuel pump cover.
21. Connect the engine wiring harness electrical connector (1) to the ECT sensor (1).
22. Install the HO2S electrical connector rosebud clip to the thermostat housing.
23. Verify the drain valves at the radiator and water pump are closed.
24. Lower the vehicle.
25. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Scheme 8

Engine Coolant Thermostat Replacement (LAF or LEA)

Scheme 9

Engine Coolant Thermostat Replacement (LFW)

Scheme 10

Engine Coolant Air Bleed Pipe Replacement (LF1 or LFW)

Scheme 11

Coolant Recovery Reservoir Vent Hose Replacement (LF1 or LFW)

Scheme 12

Coolant Recovery Reservoir Vent Hose Replacement (LEA)

Scheme 13

Coolant Recovery Reservoir Outlet Hose Replacement (LF1 or LFW)

Scheme 14

Coolant Recovery Reservoir Outlet Hose Replacement (LEA)

Scheme 15

Water Outlet Replacement (LF1)

Water Pump Replacement (LFW)

Special Tools

EN 46104 Water Pump Pulley Holder

For equivalent regional tools refer to Special Tools

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
2. Remove the generator drive belt. Refer to «Drive Belt Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-30l-repair-instructions-on-vehicle) .
3. Use the EN 46104 water pump pulley holder (1) to retain the pulley.
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. Hand tighten the water pump bolts.
4. Tighten the water pump bolts in sequence to 10 N.m (89 lb in).
5. Tighten the water pump bolts a second pass in sequence to 10 N.m (89 lb in).
6. Install the water pump pulley and the water pump pulley bolts.
7. Use the EN 46104 water pump pulley holder (1) to hold the pulley.
8. Install the water pump pulley bolts and tighten to 10 N.m (89 lb in).
9. Install the generator drive belt. Refer to «Drive Belt Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-30l-repair-instructions-on-vehicle) .
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Water Pump Replacement (L4)

Special Tools

EN-43651 Water Pump Holding Tool

For equivalent regional tools, refer to Special Tools .

1. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/chevrolet/equinox/ii-2009-2015/remont/testing-diagnostics/#engine-controlsfuel-24l-repair-instructions) .
2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-24l) .
3. If equipped, remove the coolant heater.
4. Remove the catalytic converter. Refer to «Catalytic Converter Replacement (LEA-FWD)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system) , «Catalytic Converter Replacement (LEA-AWD)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-lea-awd) .
5. Remove the engine coolant thermostat housing. Refer to «Engine Coolant Thermostat Housing Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the water pump cover (2), fasteners (3) and gasket (1) from the engine front cover.
7. Drain the coolant from the water pump using the plug at the bottom of the pump. Install the plug when finished.
8. Align the EN-43651 water pump holding tool (1) with the threads on the water pump sprocket. Tighten the water pump holding tool fasteners (2).
9. Secure the water pump holding tool with the previously removed water pump cover fasteners (1) into the engine front cover.
10. Remove the water pump sprocket to water pump fasteners (1).
11. Remove the front water pump fasteners (1).
12. Remove the rear water pump fasteners (1).
13. Remove the water pump (1).
14. If replacing the water pump cover remove the water pump rear cover fasteners (4).
15. Separate the water pump cover (1) from the water pump (3).
16. Remove and discard the water pump O-ring seal (2).

1. If replacing the water pump cover (1), install a new O-ring (2) to the water pump (3) and tighten the fasteners (4) to 25 N.m (18 lb ft).
2. Using a guide pin (2), align the pin with the water pump holding tool.
3. Position the water pump (1) against the engine block and hand tighten the water pump fasteners (3).
4. Install 2 water pump sprocket to water pump fasteners (1). After the fasteners are snug, remove the guide pin (2) and install the third fastener (3) and tighten to 10 N.m (89 lb in).
5. Install the water pump fasteners (1) at the front of the engine. Hand tighten at this time.
6. Tighten the water pump fasteners at the front and rear of the water pump to 25 N.m (18 lb ft).
7. Remove the water pump cover fasteners (1) from the engine front cover and water pump holding tool.
8. Remove the EN-43651 water pump holding tool (1) from the water pump sprocket.
9. Install the water pump access plate (2) gasket (1) and fasteners (3) and tighten to 10 N.m (89 lb in).
10. If equipped, install the coolant heater.
11. Install the engine coolant thermostat housing. Refer to «Engine Coolant Thermostat Housing Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
12. Install the catalytic converter. Refer to «Catalytic Converter Replacement (LEA-FWD)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system) , «Catalytic Converter Replacement (LEA-AWD)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-lea-awd) .
13. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/equinox/ii-2009-2015/remont/mechanical/#engine-mechanical-24l) .
14. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/chevrolet/equinox/ii-2009-2015/remont/testing-diagnostics/#engine-controlsfuel-24l-repair-instructions) .
15. Refill the coolant system. Refer to «Cooling System Draining and Filling (GE 47716)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) , «Cooling System Draining and Filling (Static LF1 or LFW)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (Static LAF or LEA)»(/chevrolet/equinox/ii-2009-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Scheme 16

Radiator Drain Cock Replacement

Scheme 17

Engine Coolant Fan Shroud Replacement (LF1 or LFW)

Scheme 18

Engine Coolant Fan Shroud Replacement (LEA)

Scheme 19

Radiator Replacement

Scheme 20

Radiator Air Lower Baffle and Deflector Replacement

Scheme 21

Radiator Air Upper Baffle and Deflector Replacement

1. If equipped with AWD, remove the exhaust manifold. Refer to «Exhaust Manifold Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system) .
2. Disconnect the coolant heater cord (1).
3. Remove the coolant heater bolt.
4. Remove the coolant heater.

1. Install the coolant heater.
2. Install the coolant heater bolt and tighten to 50 N.m (37 lb ft).
3. Connect the coolant heater cord (1).
4. If equipped with AWD, install the exhaust manifold. Refer to «Exhaust Manifold Replacement (LEA)»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system) .

Scheme 22

Coolant Heater Replacement (LFW)

Scheme 23

Coolant Heater Cord Replacement (LAF)

Scheme 24

Coolant Heater Cord Replacement (LFW)

Cooling Fan Description and Operation (3.0L)

System Overview

The engine cooling fan system consists of 2 electric cooling fans and 3 fan relays. The cooling fan relays are arranged in a series/parallel (S/P) configuration. This allows the engine control module (ECM) to operate both fans together at low or high speeds using 2 fan control circuits. The cooling fans receive positive voltage from the cooling fan relays, which receive battery positive voltage from the underhood fuse block. The cooling fans are supplied a ground at G101.

Low Speed Operation

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

High Speed Operation

The ECM applies a ground to the coil side of the cooling fan low speed relay, the S/P cooling fan speed control relay, and the cooling fan high speed relay. When energized, the high speed fan relay applies voltage directly to the right cooling fan through the switch side of the relay. Simultaneously, the low speed fan relay and the S/P speed control relay provide ignition voltage and a direct path to ground for 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 operating at high speed.

Cooling Fan Description and Operation (2.4L)

System Overview

The engine cooling fan system is composed of one cooling fan, 2 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.

Low Speed Operation

The ECM applies ground at the FAN 1 control circuit for the coil side of the low speed cooling fan relay. The energized low speed relay switch closes to supply B+ through the resistor mounted in the shroud, to the engine cooling fan motor. The result is cooling fan operation at a reduced speed.

High Speed Operation

The ECM applies ground at the FAN 2 control circuit for the coil side of the cooling fan high speed relay. The energized high speed relay switch closes to supply B+ directly to the engine cooling fan motor, by-passing the external resistor. The result is cooling fan operation at full speed.

Engine Coolant Indicator(s)

LOW COOLANT LEVEL

The IPC illuminates the low coolant warning indicator when any of the following occur

1. The BCM detects a low coolant level condition for at least 30 seconds. The IPC receives a class 2 message from the BCM requesting illumination.
2. The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

Coolant Heater

The optional engine coolant heater (RPO K05) operates using 110-volt AC external power and is designed to warm the coolant in the engine block area for improved starting in very cold weather -29°C (-20°F). The coolant heater helps reduce fuel consumption when a cold engine is warming up. The unit is equipped with a detachable AC power cord. A weather shield on the cord is provided to protect the plug when not in use. The power cord has a thermal element in the cord end that does not allow current to the heater until the ambient temperature reaches 0°F or -18°C.

The cooling system's function is to maintain an efficient engine operating temperature during all engine speeds and operating conditions. The cooling system is designed to remove approximately one-third of the heat produced by the burning of the air-fuel mixture. When the engine is cold, the coolant does not flow to the radiator until the thermostat opens. This allows the engine to warm quickly.

Cooling Cycle

Coolant flows from the radiator outlet and into the water pump inlet. Some coolant flows from the water pump, to the heater core, then back to the water pump. This provides the passenger compartment with heat and defrost capability as the coolant warms up.

Coolant also flows from the water pump outlet and into the engine block. In the engine block, the coolant circulates through the water jackets surrounding the cylinders where it absorbs heat.

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

From the cylinder heads, the coolant flows to the thermostat. The flow of coolant will either be stopped at the thermostat until the engine reaches normal operating temperature, or it will flow through the thermostat and into the radiator where it is cooled. At this point, the coolant flow cycle is completed.

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

Coolant

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

Radiator

The radiator is a heat exchanger. It consists of a core and two end tanks. The aluminum core is a tube and fin crossflow design that extends from the inlet tank to the outlet tank. Fins are placed around the outside of the tubes to improve heat transfer to the atmosphere.

The inlet and outlet end tanks are a molded, high temperature, nylon reinforced plastic material. A high temperature rubber gasket seals the end tank flange edge to the aluminum core. The end tanks are clamped to the core with clinch tabs. The tabs are part of the aluminum header at each end of the core.

The radiator utilizes a drain cock for coolant recovery during service. The drain cock is located at the bottom of the right hand or left hand end tank, depending on the powertrain option in the vehicle. The drain cock unit includes the drain cock and drain cock seal.

The radiator removes heat from the coolant passing through it. The fins on the core transfer heat from the coolant passing through the tubes. As air passes between the fins, it absorbs heat and cools the coolant.

Pressure Cap

The pressure cap seals the cooling system. It contains a blow off or pressure valve and a vacuum or atmospheric valve. The pressure valve is held against its seat by a spring, which protects the radiator from excessive cooling system pressure. The vacuum valve is held against its seat by a spring, which permits opening of the valve to relieve vacuum created in the cooling system as it cools off. The vacuum, if not relieved, might cause the radiator and/or coolant hoses to collapse.

The pressure cap allows cooling system pressure to build up as the temperature increases. As the pressure builds, the boiling point of the coolant increases. Engine coolant can be safely run at a temperature much higher than the boiling point of the coolant at atmospheric pressure. The hotter the coolant is, the faster the heat transfers from the radiator to the cooler, passing air.

The pressure in the cooling system can get too high. When the cooling system pressure exceeds the rating of the pressure cap, it raises the pressure valve, venting the excess pressure.

As the engine cools down, the temperature of the coolant drops and a vacuum is created in the cooling system. This vacuum causes the vacuum valve to open, allowing outside air into the surge tank. This equalizes the pressure in the cooling system with atmospheric pressure, preventing the radiator and coolant hoses from collapsing.

Surge Tank

The surge tank is a plastic tank that the pressure cap mounts onto. The tank is mounted at a point higher than all other coolant passages. The surge tank provides an air space in the cooling system. The air space allows the coolant to expand and contract. The surge tank also provides a coolant fill point and a central air bleed location. During vehicle use, the coolant heats and expands. The coolant that is displaced by this expansion flows into the surge tank. As the coolant circulates, air is allowed to exit. This is an advantage to the cooling system. Coolant without bubbles absorbs heat much better than coolant with bubbles.

Air Baffles and Seals

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

Water Pump

The water pump is a centrifugal vane impeller type pump. The pump consists of a housing with coolant inlet and outlet passages 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 from the drive belt.

Thermostat

The thermostat is a coolant flow control component. Its purpose is to help regulate the operating temperature of the engine. It utilizes a temperature sensitive wax-pellet element. The element connects to a valve through a small piston. When the element is heated, it expands and exerts pressure against the small piston. 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. After the coolant temperature reaches the 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, 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

The transmission oil cooler is a heat exchanger. It is located inside one of the radiator end tanks. The transmission fluid temperature is regulated by the temperature of the engine coolant in the radiator. The transmission oil pump, pumps the fluid through the transmission oil cooler line to the transmission oil cooler. The fluid then flows through the cooler where the engine coolant absorbs heat from the fluid. The fluid is then pumped through the transmission oil cooler return line, to the transmission.

Special Tools

Illustration Tool Number /Description BO 38185 J 38185 Hose Clamp Pliers EN 43651 J 43651 Waterpump Holding Tool EN 46104 Water Pump Pulley Holding Tool GE 25025-5 J 25025-5 Dial indicator Mounting Post M X 1.00 GE 47716 Vac N Fill Coolant Refill Tool GE 47827 Socket EN 24460-A J 24460-01 Cooling System Pressure Tester GE 24731 J 24731 Tempil Stick GE 26568 J 26568 Coolant and Battery Fluid Tester GE 42220 J 42220 Universal 12V Leak Detection Lamp GE 42401 A J 42401 Radiator Cap/Surge Tank Test Adapter EN 43650 J 43650 Waterpump Holding Tool

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Electrical Center Identification Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Relay Replacement (Within an Electrical Center)
• Relay Replacement (Attached to Wire Harness)
• Engine Controls Schematics
• Instrument Cluster Description and Operation
• Engine Control Module Scan Tool Information (LFX or LFW)
• Water Pump Cleaning and Inspection
• Coolant in Engine Oil
• Temperature Versus Resistance (Engine Coolant Temperature Sensor)
• Temperature Versus Resistance - Intake Air Temperature Sensor (Hitatchi Sensor)
• Diagnostic Trouble Code (DTC) List - Vehicle
• Drive Belt Tensioner Diagnosis
• Drive Belt Tensioner Diagnosis
• Engine Oil and Oil Filter Replacement
• Engine Oil and Oil Filter Replacement (LF1, LFW or LFX)
• Engine Coolant/Water in Transmission
• Coolant in Combustion Chamber
• Coolant in Combustion Chamber
• Coolant in Engine Oil
• Lifting and Jacking the Vehicle
• Fastener Caution
• Approximate Fluid Capacities
• Intake Manifold Cover Replacement
• Fuel Pipe Shield Replacement
• Adhesives, Fluids, Lubricants, and Sealers
• Exhaust Manifold Heat Shield Replacement (LEA)
• Air Cleaner Assembly Replacement
• Catalytic Converter Replacement (LEA-AWD)
• Front Bumper Fascia Support Replacement
• Air Conditioning Compressor Hose Replacement (LF1 or LFW)
• Air Conditioning Compressor Hose Replacement (LEA)
• Air Conditioning Condenser Replacement
• DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LFW)
• Cooling Fan Description and Operation (3.0L)
• Cooling Fan Description and Operation (2.4L)
• Cooling System Draining and Filling (GE 47716)
• Cooling System Draining and Filling (Static LF1 or LFW)
• Thermostat Diagnosis
• Engine Overheating
• Loss of Coolant
• Engine Fails To Reach Normal Operating Temperature
• Flushing
• Water Pump Replacement (LFW)
• Water Pump Replacement (L4)
• Cooling System Leak Testing
• Pressure Cap Testing
• Radiator Inlet Hose Replacement (LEA)
• Radiator Inlet Hose Replacement (LF1 or LFW)
• Special Tools
• Radiator Outlet Hose Replacement (LF1 or LFW)
• Radiator Outlet Hose Replacement (LEA)