Engine Cooling System Chevrolet Cruze I рестайлинг

Temperature Versus Resistance

Temperature Versus Resistance

Fastener Tightening Specifications (1.4L LUV)

Fastener Tightening Specifications (1.4L LUV)

Fastener Tightening Specifications (1.8L LUW and LWE)

Fastener Tightening Specifications (1.8L LUW and LWE)

Engine Cooling System Specifications (1.4L LUV)

Engine Cooling System Specifications (1.8L LUW and LWE)

Scheme 1

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Typical Scan Tool Data

Radiator Coolant Temperature Sensor

Circuit/System Description

Note. The radiator coolant temperature sensor is referred to as B34B Engine Coolant Temperature Sensor 2 in schematics and other areas.

The radiator coolant temperature (RCT) sensor is a variable resistor that measures the temperature of the engine coolant in the radiator. This diagnostic checks for an open, short to ground or an intermittent circuit condition between the engine control module (ECM) and RCT sensor.

The following table illustrates the difference between temperature, resistance, and voltage

Conditions for Running the DTC

P00B3

1. The engine run time is greater than 10 s.
2. The intake air temperature (IAT) is colder than 70°C (158°F).
3. The DTC runs continuously when the above conditions are met.

P00B4

1. The engine run time is greater than 60 s.
2. The intake air temperature (IAT) is warmer than -7°C (19°F).
3. The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P00B3

The ECM detects that the RCT sensor is warmer than 149°C (300°F) for greater than 10 s.

P00B4

Note. The scan tool only displays to -40°C (-40°F).

The ECM detects that the RCT sensor is colder than -60°C (-76°F) for greater than 10 s.

Action Taken When the DTC Sets

DTC P00B3 and P00B4 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTC P00B3 and P00B4 are Type B DTCs.

Diagnostic Aids

Note. The engine coolant temperature (ECT) sensor is mounted on the engine and the radiator coolant temperature (RCT) sensor is mounted on the radiator.

1. As the thermostat opens, the RCT sensor temperature should rise steadily, then stabilize once the thermostat opens completely.
2. Test the RCT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor.
3. If the vehicle has sat for greater than 8 hours, the ECT sensor and the RCT sensor values should display within 3°C (5°F).

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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. Ignition ON.
2. Verify the scan tool Radiator Coolant Temperature Sensor parameter is between -39 to + 120°C (-38 to +248°F) and changes with engine run time. If not between -39 to + 120°C (-38 to +248°F) or does not change Refer to Circuit/System Testing below. If between -39 to + 120°C (-38 to +248°F) and changes
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing below. If the DTC does not set
5. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B34B Engine Coolant Temperature Sensor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 1 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
3. Ignition ON.
4. Verify the scan tool Radiator Coolant Temperature Sensor parameter is colder than -39°C (-38°F). If warmer than -39°C (-38°F) Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If colder than -39°C (-38°F)
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
6. Verify the scan tool Radiator Coolant Temperature sensor parameter is warmer than 137°C (280°F). If colder than 137°C (280°F) Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If warmer than 137°C (280°F)
7. Test or replace the B34B Engine Coolant Temperature Sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B34B Engine Coolant Temperature Sensor.
2. Test the RCT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__temperature-versus-resistance) table. The resistance values should be in range of the table values. If not within the specified range Replace the B34B Engine Coolant Temperature Sensor. If within the specified range
3. Test for infinite resistance between each terminal and the sensor housing. If less than infinite resistance Replace the B34B Engine Coolant Temperature Sensor. If infinite resistance
4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Temperature Sensor Replacement (Radiator)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Engine Coolant Temperature Sensor Replacement (Water Outlet)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) for radiator coolant temperature sensor replacement.
2. «Engine Control Module Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-18l-luw-and-lwe-repair-instructions__engine-control-module-replacement) for engine control module replacement, setup, and programming.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Radiator Coolant Temperature Sensor

Circuit Description

The engine coolant temperature sensor is a variable resistor that measures the temperature of the engine coolant in the radiator. The engine control module (ECM) supplies 5 volts to the engine coolant temperature signal circuit and supplies a ground to the low reference circuit. The purpose of this diagnostic is to determine if the input from the RCT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the engine is OFF. If the required engine OFF time is met at start-up, the ECM will compare the temperature difference between the actual measured RCT and ECT sensors.

The following table illustrates the difference between temperature, resistance, and voltage

1. DTCs P00B3, P00B4, P00B6, P0112, P0113, P0117, P0118, P0502, P0503 or P2610 are not set.
2. The vehicle has been OFF for greater than 8 hours before vehicle ON.
3. The vehicle is ON, or the engine is running.
4. The intake air temperature (IAT) is warmer than -7°C (19°F).
5. The fuel level is greater than 10 percent.
6. The DTC runs once per ignition cycle when the above conditions are met.

The ECM determines the absolute difference of temperature between the RCT start up temperature and ECT start up temperature is greater than 20°C (68°F).

DTC P00B6 is a Type B DTC.

DTC P00B6 is a Type B DTC.

1. As the thermostat opens, the radiator coolant temperature sensor signal should rise steadily, then stabilize once the thermostat opens completely.
2. Inspect for the correct operation of the engine cooling system and verify the correct coolant level.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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. Engine running, observe the DTC information with a scan tool. DTC P00B3, P00B4, P0117, P0118, P0597, P0598, or P0599 should not be set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) for further diagnosis.
2. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Loss of Coolant»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
3. Engine idling for 15 minutes with the A/C OFF.
4. Command the engine coolant thermostat heater to 100 percent with a scan tool. Increase the engine speed to 3, 000 RPM. Observe the scan tool radiator coolant temperature sensor and ECT sensor parameters. The radiator coolant temperature sensor and the ECT sensor parameters should be within 20°C (68°F).
5. 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. Vehicle OFF, disconnect the harness connector at the B34B engine coolant temperature sensor.
2. Vehicle OFF, all systems OFF. This may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal 1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
3. Vehicle ON, verify the scan tool Radiator Coolant Temperature Sensor parameter is at -40°C (-40°F). If warmer than the specified range, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
4. Install a 1 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Radiator Coolant Temperature Sensor parameter is at 140°C (284°F). If less than specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
5. If all circuits test normal, test or replace the B34B engine coolant temperature sensor.

1. Vehicle OFF, remove the B34B engine coolant temperature sensor.
2. Test the engine coolant temperature sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__temperature-versus-resistance) table and verify that the resistance is within 5 percent of the specification. If not within the specified range, replace the B34B engine coolant temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Temperature Sensor Replacement (Radiator)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Engine Coolant Temperature Sensor Replacement (Water Outlet)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions)
2. «Engine Control Module Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-18l-luw-and-lwe-repair-instructions__engine-control-module-replacement) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Radiator Coolant Temperature Sensor

The engine control module (ECM) monitors the temperature of the engine radiator coolant. The ECM controls the thermostat with a pulse width modulated (PWM) signal. The ECM compares the radiator coolant temperature to the engine coolant temperature in order to determine if there sufficient coolant flow through the thermostat.

1. DTCs P00B3, P00B4, P00B6, P0116, P0117, and P0118 are not set.
2. The engine run time is greater than 5 m. OR
3. The engine coolant temperature is greater than 105°C (221°F).
4. The DTC runs continuously when the above conditions are met.

Note. The scan tool display range is between -40 and + 150°C (-40 and +302°F).

The ECM detects the difference between the RCT sensor and the ECT sensor is greater than 30°C (86°F) when the ECT sensor is warmer than 117°C (242°F) for greater than 5 s.

DTC P00B7 is a Type B DTC.

DTC P00B7 is a Type B DTC.

1. The thermostat has a mechanical fail-safe in case of an electrical condition with the thermostat heater. The mechanical thermostat will open at approximately 80°C (176°F). The mechanical thermostat will cycle from approximately 85°C (185°F) to approximately 102°C (215°F).
2. A resistance condition in the RCT sensor circuits may cause this DTC. This condition results in a greater voltage on the RCT sensor signal circuit, which is interpreted by the ECM as a colder RCT.

Schematic Reference

Engine Controls Schematics

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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. Engine Running, observe the DTC information with a scan tool. DTC P00B3, P00B4, P00B6, P0117, P0118, P0597, P0598, and P0599 should not be set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) for further diagnosis.
2. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Loss of Coolant»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
3. Verify the engine cooling fan operates. Refer to «Cooling Fan Inoperative»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Engine idling for 15 minutes with the A/C OFF.
5. Command the Engine Coolant Thermostat Heater to 100 percent with a scan tool. Increase the engine speed to 3, 000 RPM. Observe the scan tool ECT sensor parameter. The temperature should decrease to less than 85°C (185°F).
6. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

1. Vehicle OFF, inspect the cooling system for the conditions below. Refer to «Symptoms - Engine Cooling»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) . Weak coolant solution Obstructed radiator air flow or bent radiator fins Blocked cooling system passages Radiator hoses that are restricted, collapsed, or deteriorated Damaged water pump and or belt Loss of cooling system pressure Leaking surge tank cap Radiator hoses Cylinder head or an engine block that is cracked or plugged If you find any of the above conditions, repair as necessary.
2. If all conditions test normal, replace the E41 engine coolant thermostat heater.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Engine Coolant Thermostat Replacement

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

KR20C Cooling Fan Low Speed Relay

KR20D Cooling Fan High Speed Relay

KR20E Cooling Fan Speed Control Relay

KR20F Cooling Fan Relay

KR20P Cooling Fan Medium Speed Relay

The engine cooling fan system is composed of one cooling fan, a series of 5 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes two resistors. This combination of components enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.

1. The ignition voltage is greater 11 volts.
2. The ECM has commanded the output driver ON and OFF at least once during the ignition cycle.
3. The DTCs 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 scan tool Cooling Fan Relay Command parameters 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 a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
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 Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/cruze/i-2012-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/cruze/i-2012-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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.
2. Verify an audible click is heard or felt from each cooling fan relay when commanding the cooling fan ON and OFF with a scan tool. If a click is not heard or felt at each of the relays Refer to Circuit/System Testing below. If a click is heard or felt at each of the relays
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.
4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing below. If the DTC does not set
5. All OK.

1. Ignition OFF, disconnect the KR20 cooling fan relays listed below: KR20F Cooling Fan Relay KR20P Cooling Fan Medium Speed Relay KR20D Cooling Fan High Speed Relay
2. Ignition ON, verify that a test lamp illuminates between ground and the relay coil ignition circuit terminal listed below: KR20F Cooling Fan Relay terminal 85 KR20P Cooling Fan Medium Speed Relay terminal 1 If the test lamp does not illuminate and the fuse is good Ignition OFF, and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Test for less than 2 ohms in the ignition circuit of the appropriate KR20 Cooling Fan Relay, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Test for infinite resistance between the relay coil ignition circuits listed below and ground: KR20F Cooling Fan Relay terminal 85 KR20D Cooling Fan High Speed Relay terminal 1 If less than infinite resistance, repair the short to ground in the circuit. If infinite resistance, test all of the appropriate KR20 Cooling Fan Relays for a short and replace as necessary. If the test lamp illuminates
3. Ignition OFF, remove the test lamp, ignition ON.
4. Connect a DMM, set on the diode setting, between a control circuit terminal listed below and ground: KR20F Cooling Fan Relay terminal 86 KR20P Cooling Fan Medium Speed Relay terminal 2 KR20D Cooling Fan High Speed Relay terminal 2
5. Verify the DMM reading is greater than 2.5 V or displays O.L. If 2.5 V or less Ignition OFF, and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Disconnect the X1 harness connector at the K20 Engine Control Module. Test for infinite resistance between the appropriate relay coil control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If greater than 2.5 V or displays O.L.
6. Verify the DMM reading is less than 1 V when commanding the Cooling Fan Relays ON with a scan tool. If 1 V or greater Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the appropriate KR20 Cooling Fan Relay control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V. Ignition OFF. Test for less than 2 ohms in the appropriate KR20 Cooling Fan Relay control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 1 V
7. Test or replace the appropriate KR20 Cooling Fan Relay.

1. Ignition OFF.
2. Disconnect a KR20 Cooling Fan Relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. 95-135 ohms for the KR20F Cooling Fan Relay. If less than or greater than the specified range Replace the KR20 Cooling Fan Relay. If within the specified range
4. Test for infinite resistance between the following terminals: 30/3 and 86/1 30/3 and 87/5 30/3 and 85/2 85/2 and 87/5 If less than infinite resistance Replace the KR20 Cooling Fan Relay. If infinite resistance
5. Install a 20 A fused jumper wire between relay terminal 85/2 and 12 V.
6. Install a jumper wire between relay terminal 86/1 and ground.
7. Test for less than 2 ohms between terminals 30/3 and 87/5. If 2 ohms or greater Replace the KR20 Cooling Fan Relay. If less than 2 ohms
8. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/chevrolet/cruze/i-2012-2015/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/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) controls the pulse width modulated (PWM) thermostat. The thermostat controls coolant flow and regulates the engine operating temperature. Ignition voltage is supplied directly to the thermostat through a fuse. The ECM controls the thermostat by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

Conditions for Running the DTCs

1. The ignition is ON, or the engine is running.
2. The DTCs run continuously once the above condition is met

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 15 seconds.

1. DTCs P0597, P0598, and P0599 are Type B DTCs.
2. The engine control module commands the engine cooling fans ON.

Conditions for Clearing the DTC

DTCs P0597, P0598, and P0599 are Type B DTCs.

1. A low engine coolant level could cause the thermostat heater to overheat and set a DTC.
2. The thermostat has a mechanical fail-safe in case of an electrical condition with the thermostat heater. The mechanical thermostat will open at approximately 80°C (176°F). The mechanical thermostat will cycle from approximately 85°C (185°F) to approximately 102°C (215°F).

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. «Loss of Coolant»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) , and «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) If the coolant level is not correct Repair as necessary. If the coolant level is correct
2. Ignition ON.
3. Verify the parameters listed below do not display Malfunction when commanding the Engine Coolant Thermostat Heater ON and OFF with a scan tool. Engine Coolant Thermostat Heater Control Circuit Low Voltage Test Status Engine Coolant Thermostat Heater Control Circuit Open Test Status Engine Coolant Thermostat Heater Control Circuit High Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing below. If Malfunction is not displayed
4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
5. Verify the DTC does not set. If any DTC sets Refer to Circuit/System Testing below. If the DTC does not set
6. All OK.

1. Ignition OFF, disconnect the harness connector at the E41 Engine Coolant Thermostat Heater, Ignition ON.
2. Verify that a test lamp illuminates between the ignition circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground in the circuit. If infinite resistance, test all the components connected to fuse and replace as necessary. If the test lamp illuminates
3. Verify that a test lamp does not illuminate between the ignition circuit terminal 2 and the control circuit terminal 1. If the test lamp illuminates Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp does not illuminate
4. Remove the test lamp, command the E41 Engine Coolant Thermostat Heater ON with a scan tool.
5. Verify the scan tool E41 Engine Coolant Thermostat Heater Control Circuit High Voltage Test Status parameter displays OK. If OK is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
6. Install a 3 A fused jumper wire between the control circuit terminal 1 and the ignition circuit terminal 2.
7. Verify the scan tool Engine Coolant Thermostat Heater Circuit High Voltage Test Status parameter is displaying Malfunction when commanding the E41 Engine Coolant Thermostat Heater ON with a scan tool. If Malfunction is not displayed Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If Malfunction is displayed
8. Test or replace the E41 Engine Coolant Thermostat Heater.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Thermostat Replacement»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) for E41 engine coolant thermostat heater replacement.
2. «Control Module References»(/chevrolet/cruze/i-2012-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module, replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) monitors temperature difference between the engine coolant temperature (ECT) sensor and the radiator coolant temperature (RCT) sensor during a cold start-up. The purpose of this diagnostic is to analyze the engine coolant thermostat for being stuck open.

1. DTCs P00B3, P00B4, P00B6, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, or P0118 are not set.
2. The engine run time is between 70 s and 30 min.
3. The engine coolant temperature (ECT) sensor at start-up is between -10°C to +59°C (14°F to 138°F).
4. The intake air temperature (IAT) sensor is between -7°C to +60°C (-4°F to +140°F).
5. The airflow into the engine is between 1 to 100 g/s.
6. The DTC runs once per ignition cycle when the above conditions are met.

The ECM detects the engine coolant thermostat is stuck open for at least 2.5 min.

DTC P2181 is a Type B DTC

DTC P2181 is a Type B DTC

1. Insufficient vehicle interior heating is an indication of improper thermostat operation.
2. The scan tool Desired ECT Sensor and the ECT Sensor parameters should be within 5°C (9°F) when the engine is at operating temperature.
3. A resistance condition in the ECT sensor circuits may cause this DTC. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cooling System Description and Operation (1.4L LUV) , Cooling System Description and Operation (1.8L LUW and LWE)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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. Engine running, observe the DTC information with a scan tool. DTC P00B3, P00B4, P00B6, P0117, or P0118 should not be set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) for further diagnosis.
2. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Loss of Coolant»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
3. Engine idling for 15 min with the A/C OFF. Verify the engine cooling fan is not ON at all times.
4. Command the Engine Coolant Thermostat Heater to 0 % with a scan tool. Increase the engine speed to 3, 000 RPM. Observe the scan tool ECT sensor parameter. The temperature should increase to greater than 102°C (215°F). If less than the specified value, replace the E41 engine coolant thermostat heater.
5. 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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Engine Coolant Thermostat Replacement

Important Preliminary Inspections Before Starting

Before using the Symptom diagnosis, perform the following

1. Perform «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) and verify all of the following items: Engine control module (ECM) and malfunction indicator lamp (MIL) 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 , and Cooling System Description and Operation (1.4L LUV) , Cooling System Description and Operation (1.8L LUW and LWE) .

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»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Cooling Fan Inoperative»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Overheating»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating)
4. «Loss of Coolant»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant)
5. «Thermostat Diagnosis (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis-18l-luw-and-lwe) , «Thermostat Diagnosis (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis-14l-luv)
6. «Engine Fails To Reach Normal Operating Temperature»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-fails-to-reach-normal-operating)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of the diagnostic category.

The engine cooling fan system is composed of one cooling fan, a series of 5 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes two resistors. This combination of components enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. 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 in the appropriate engine controls subsection.
3. If the cooling fan operates at high speed when the ECM is requesting medium speed operation, test or replace the KR20E Cooling Fan Speed Control Relay.

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/cruze/i-2012-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/cruze/i-2012-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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.
2. Verify that there are no cooling system DTCs set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) . If no DTCs are set
3. Verify the scan tool parameters listed below display OFF. Cooling Fan Relay 1 Command Cooling Fan Relays 2 and 3 Command If a scan tool parameter displays ON Refer to Diagnostic Aids and «Symptoms - Engine Cooling»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) for further diagnosis. If both scan tool parameters display OFF
4. Verify that the fan is not activated. If the fan is operating Refer to Circuit/System Testing below. If the fan is OFF
5. All OK.

1. Ignition OFF, disconnect each KR20 cooling fan relay one at a time, in the order listed below, ignition ON: KR20F Cooling Fan Relay KR20C Cooling Fan Low Speed Relay KR20P Cooling Fan Medium Speed Relay KR20D Cooling Fan High Speed Relay
2. Verify that the cooling fan is not activated after each relay is removed. If the cooling fan is ON with all of the listed relays removed Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON. Test for less than 1 V between ground and the relay controlled output circuit terminal listed below: KR20C Cooling Fan Low Speed Relay terminal 87 KR20P Cooling Fan Medium Speed Relay terminal 5 KR20D Cooling Fan High Speed Relay terminal 3 If 1 V or greater, repair the short to voltage in the appropriate circuit. If the cooling fan is OFF after a listed relay is removed
3. Replace the appropriate KR20 Cooling Fan Relay.

1. Ignition OFF.
2. Disconnect a KR20 Cooling Fan Relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. 95-135 ohms for the KR20F Cooling Fan Relay. If less than or greater than the specified range Replace the KR20 Cooling Fan Relay. If within the specified range
4. Test for infinite resistance between the following terminals: 30/3 and 86/1 30/3 and 87/5 30/3 and 85/2 85/2 and 87/5 If less than infinite resistance Replace the KR20 Cooling Fan Relay. If infinite resistance
5. Install a 20 A fused jumper wire between relay terminal 85/2 and 12 V.
6. Install a jumper wire between relay terminal 86/1 and ground.
7. Test for less than 2 ohms between terminals 30/3 and 87/5. If 2 ohms or greater Replace the KR20 Cooling Fan Relay. If less than 2 ohms
8. All OK.

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/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cruze/i-2012-2015/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine cooling fan system is composed of one cooling fan, a series of 5 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes two resistors. This combination of components enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. 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 Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/cruze/i-2012-2015/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/cruze/i-2012-2015/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/cruze/i-2012-2015/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.
2. Verify that DTC P0480, P0481, P0691, P0692, P0693, or P0694 is not set. If a DTC is set Refer to «DTC P0480, P0481, P0691, P0692, P0693, or P0694»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) . If no DTC is set
3. Verify that the cooling fan operates at low, medium, and high speed, when commanding the appropriate cooling fan relays ON and OFF with a scan tool. If the cooling fan does not operate at all speeds Refer to Circuit/System Testing below. If the cooling fan operates at all speeds
4. All OK.

Inoperative in All Speeds

1. Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor.
2. Verify a test lamp illuminates between the ground circuit terminal 1 and B+ If the test lamp does not illuminate Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If the test lamp illuminates
3. Test or replace the G10 Cooling Fan Motor. Replace the cooling fan fuses if necessary.

Low, Medium or High Speed Inoperative

1. Disconnect the following cooling fan relays, ignition ON: KR20C Cooling Fan Low Speed Relay KR20D Cooling Fan High Speed Relay KR20E Cooling Fan Speed Control Relay KR20F Cooling Fan Relay KR20P Cooling Fan Medium Speed Relay
2. Verify a test lamp illuminates between ground and each of the cooling fan relay B+ circuit terminals listed below: KR20C Cooling Fan Low Speed Relay terminal 30 KR20D Cooling Fan High Speed Relay terminal 5 KR20P Cooling Fan Medium Speed Relay terminal 3 If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the appropriate relay B+ circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor. Test for infinite resistance between the appropriate relay controlled output circuit terminal listed below and ground: KR20C Cooling Fan Low Speed Relay terminal 87 KR20D Cooling Fan High Speed Relay terminal 3 KR20P Cooling Fan Medium Speed Relay terminal 5 If less than infinite resistance, repair the short to ground in the circuit. If infinite resistance, test or replace the G10 Cooling Fan Motor, replace the fuse as necessary. If the test lamp illuminates
3. Verify a test lamp illuminates between the KR20F Cooling Fan Relay output circuit terminal 87 and B+. If the test lamp does not illuminate Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ground circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If the test lamp illuminates
4. Ignition OFF, Install the KR20F Cooling Fan Relay, ignition ON.
5. Verify a test lamp illuminates between ground and each of the cooling fan relay terminals listed below: KR20C Cooling Fan Low Speed Relay terminal 85 KR20E Cooling Fan Speed Control Relay terminal 86 and 30 If the test lamp does not illuminate at each terminal Ignition OFF, remove the test lamp. Test for less than 2 ohms in the appropriate relay ignition circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp illuminates at each terminal
6. Command the cooling fan ON at low speed with a scan tool.
7. Verify a test lamp illuminates between B+ and each of the KR20 Cooling Fan Relay terminals listed below: KR20C Cooling Fan Low Speed Relay terminal 86 KR20E Cooling Fan Speed Control Relay terminal 85 If the test lamp does not illuminate Ignition OFF, remove the test lamp and disconnect the KR20F Cooling Fan Relay. Test for less than 2 ohms between the KR20F Cooling Fan Relay terminal 30 and the relay control circuit terminals listed below: KR20C Cooling Fan Low Speed Relay terminal 86 KR20E Cooling Fan Speed Control Relay terminal 85 If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the KR20F Cooling Fan Relay. If the test lamp illuminates
8. Ignition OFF, install the KR20E Cooling Fan Speed Control Relay, Ignition ON.
9. Command the cooling fan ON at low speed with a scan tool.
10. Verify a test lamp illuminates between ground and the KR20D High Speed Relay ignition circuit terminal 1. If the test lamp does not illuminate Ignition OFF, remove the test lamp and disconnect the KR20E Cooling Fan Speed Control Relay. Test for less than 2 ohms between the KR20D High Speed Relay terminal 1 and KR20E Cooling Fan Speed Control Relay 87 If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the KR20E Cooling Fan Speed Control Relay. If the test lamp illuminates
11. Ignition OFF, install all of the previously removed KR20 Cooling Fan Relays. Disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON.
12. Command the cooling fan ON at high speed with a scan tool.
13. Verify a test lamp illuminates between ground and each of the G10 Cooling Fan Motor circuit terminals listed below: G10 Cooling Fan low speed circuit terminal 2 G10 Cooling Fan medium speed circuit terminal 3 G10 Cooling Fan high speed circuit terminal 4 If the test lamp does not illuminate at each terminal Ignition OFF, remove the test lamp. Disconnect the appropriate relay from the list below: KR20C Cooling Fan Low Speed Relay KR20D Cooling Fan High Speed Relay KR20P Cooling Fan Medium Speed Relay Test for less than 2 ohms in the relay controlled output circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the relay. If the test lamp illuminate at each terminal
14. Test or replace the G10 Cooling Fan Motor.

1. Ignition OFF.
2. Disconnect a KR20 Cooling Fan Relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. 95-135 ohms for the KR20F Cooling Fan Relay. If less than or greater than the specified range Replace the KR20 Cooling Fan Relay. If within the specified range
4. Test for infinite resistance between the following terminals: 30/3 and 86/1 30/3 and 87/5 30/3 and 85/2 85/2 and 87/5 If less than infinite resistance Replace the KR20 Cooling Fan Relay. If infinite resistance
5. Install a 20 A fused jumper wire between relay terminal 85/2 and 12 V.
6. Install a jumper wire between relay terminal 86/1 and ground.
7. Test for less than 2 ohms between terminals 30/3 and 87/5. If 2 ohms or greater Replace the KR20 Cooling Fan Relay. If less than 2 ohms
8. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/cruze/i-2012-2015/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Replacement»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Overheating

Engine Overheating

Loss of Coolant

Loss of Coolant

Thermostat Diagnosis (1.4L LUV)

Thermostat Diagnosis (1.4L LUV)

Thermostat Diagnosis (1.8L LUW and LWE)

Thermostat Diagnosis (1.8L LUW and LWE)

Engine Fails To Reach Normal Operating Temperature

Engine Fails To Reach Normal Operating Temperature

Cooling System Leak Testing

Special Tools

1. EN-471 Adapter
2. EN-6327-A Cooling System Test Adapter

For equivalent regional tools, refer to Special Tools .

1. Detach the coolant expansion tank closure cap.
2. Check the coolant level. Top up the coolant to the COLD mark if necessary.
3. Pull the coolant expansion tank from the bracket in the direction of the battery.
4. Attach the coolant system tester (1) with EN-471 adapter (2) and EN-6327-A adapter (3) to the coolant expansion tank.
5. Apply approximately 100 kPa (15 psi) to the cooling system.
6. Cooling system, check for leaks.
7. Detach the cooling system tester. Release the pressure Detach the cooling system tester with EN-471 adapter.
8. Attach the coolant expansion tank closure cap.
9. Slide the coolant expansion tank onto the bracket.

Special Tools

1. GE-26568 Coolant and Battery Fluid Tester
2. GE-42401-A Radiator Pressure Adapter
3. GE-47716 Vac N Fill Coolant Refill Tool

For equivalent regional tools, refer to Special Tools

Draining Procedure

1. Unscrew the surge tank cap to remove vacuum when draining coolant.
2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/cruze/i-2012-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Place a container under the radiator drain.
4. Unscrew the radiator drain plug (1) until coolant flows out the radiator drain.
5. 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 «Coolant System Flushing»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__coolant-system-flushing) .

Vac-N-Fill Procedure

1. Close the radiator drain cock by hand.
2. Install GE-42401-2 adapter into the surge tank fill neck.
3. Install GE-42401-3 adapter to the surge tank fill neck.
4. Attach the Vac N Fill cap to the GE-42401-3 adapter.
5. Attach the vacuum gauge assembly to the Vac N Fill cap.
6. Attach the fill hose to the barb fitting on the vacuum gauge assembly. Ensure that the valve is closed.
7. Pour the coolant mixture into the graduated reservoir.
8. Place the fill hose in the graduated reservoir.
9. Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
10. Attach the venturi assembly to the vacuum tank.
11. Attach a shop air hose to the venturi assembly. Ensure the valve on the venturi assembly is closed.
12. Attach the vacuum hose to the vacuum gauge assembly and the vacuum tank.
13. Open the valve on the venturi assembly. The vacuum gauge will begin to rise and a hissing noise will be present.
14. 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.
15. To aid in the fill process, position the graduated reservoir above the coolant fill port.
16. 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.
17. Close the valve on the venturi assembly.
18. 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/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
19. Open the valve on the vacuum gauge assembly. The vacuum gauge will drop as coolant is drawn into the system.
20. Once the vacuum gauge reaches zero, close the valve on the vacuum gauge assembly and repeat steps 10-16.
21. Detach the Vac N Fill cap from the vehicle's coolant fill port.
22. Add coolant to the system as necessary.
23. Inspect the concentration of the coolant mixture, using the GE-26568 tester.
24. Detach the vacuum hose from the vacuum gauge assembly.
25. Attach the extraction hose to the vacuum hose.
26. Open the valve on the venturi assembly to start a vacuum draw.
27. Use the extraction hose to draw out coolant to the proper level.
28. The vacuum tank has a drain valve on the bottom of the tank. Open the valve to drain coolant from the vacuum tank into a suitable container for disposal.

GE-26568 Coolant and Battery Fluid Tester

For equivalent regional tools, refer to Special Tools .

1. Unscrew the surge tank cap to remove vacuum when draining coolant.
2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/cruze/i-2012-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Place a container under the radiator drain.
4. Unscrew the radiator drain plug (1) until coolant flows out the radiator drain.
5. 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 «Coolant System Flushing»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__coolant-system-flushing) .

Fill Procedure

1. Close the radiator drain plug.
2. Lower the vehicle.
3. Vehicle should be level.
4. Loosen the vent screw (1) on the radiator.
5. Add a mixture of 50/50 DEX-COOL® antifreeze and clean drinkable water to the bottom line of the bleed nozzle on the coolant surge tank (1). When the coolant level stabilizes, add enough coolant to reach the bottom line of the down pipe hole (black arrow).
6. Start the engine. After the engine starts, verify that the coolant level reaches the bottom line of the down pipe hole (black arrow).
7. Install the surge tank cap.
8. Warm up the engine. NOTE: If the heater core has been replaced, let the engine run for 2 minutes at 2.000-2.500 RPM. This ensures complete venting of the cooling system. Run at 2, 500 RPM until the engine cooling fan turns ON.
9. Turn the engine OFF and allow the engine to cool down.
10. Remove the surge tank cap.
11. Check the coolant level and fill to the "COLD" mark if necessary (1).
12. Inspect the concentration of the engine coolant, using GE-26568 tester.
13. Install the surge tank cap.
14. Rinse away any excess coolant from the engine and the engine compartment.

Coolant System 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 manufactures instruction. However, always remove the thermostat before back flushing the system.

1. Apply the park brake.
2. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Fill the coolant system with clean drinkable water. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Start the engine and run at 2.000 RPM until the thermostat opens.
5. Turn OFF the engine.
6. Drain the coolant system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Repeat the above procedure until the water from the coolant system is colorless.
8. Drain the coolant system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Add 3.8 liters (1.0 gal) of concentrated antifreeze since there will be some water in the system.
10. Add a mixture of 50/50 antifreeze and clean drinkable water until the level stabilizes at the weld seam on the surge tank. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

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.

Removal Procedure

Note. Use only a GM released anti-freeze mixture and ensure a concentration of 50 percent water to 50 percent antifreeze. Antifreeze does not just prevent the cooling system from freezing up, it also protects all the components that are in contact with coolant from rust/limescale deposits. As a result, antifreeze should always be added, even in tropical countries. In addition to the anti-freeze mixture, water quality also plays an important role. Potable tap water should normally suffice to fulfil this requirement. The quality of regenerated sea water is not suitable.

1. Open the cooling system by removing the radiator surge tank cap.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/cruze/i-2012-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Install a drain hose, slowly open the drain screw (1) and allow the to drain out max. 1.5 liter (1.36 quarts) coolant fluid into a clean measuring pincher.
4. Lower the vehicle.
5. Remove the engine coolant air bleed hose (6), remove the clamp.
6. Remove the radiator surge tank engine hose (5), remove the clamp.
7. Remove radiator surge tank clip (2).
8. Disconnect coolant level sensor wiring harness plug (4).
9. Remove the radiator surge tank (1), unclip from the bracket (3).

Installation Procedure

1. Install the radiator surge tank (1) and clip into the bracket (3).
2. Connect coolant level sensor wiring harness plug (4).
3. Install radiator surge tank clip (2).
4. Install the radiator surge tank engine hose (5), install the clamp.
5. Install the engine coolant air bleed hose (6), install the clamp.
6. Refill the radiator surge tank with the coolant fluid, which has been drained out before.

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Loosen the hose clamp (4).
3. Remove the radiator surge tank hose (3) from the surge tank (5).
4. Loosen the clamp (2).
5. Remove the radiator surge tank hose (3) from the radiator outlet hose (1).

1. Install the radiator surge tank outlet hose (3) to the radiator outlet hose (1).
2. Install the clamp (2).
3. Install the radiator surge tank outlet hose (3) to the surge tank (5).
4. Install the clamp (4).
5. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 2

Radiator Inlet Hose Replacement (1.4L LUV)

1. Disconnect the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Unclip the engine control module, if necessary.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/cruze/i-2012-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
4. Place a drain pan below the vehicle.
5. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Loosen the radiator inlet hose clamp (2).
7. Remove the radiator inlet hose (3) from the radiator (1).
8. Loosen the radiator inlet hose clamp (4).
9. Remove the radiator inlet hose (3) from the thermostat housing (5).

1. Install the radiator inlet hose (3) to the thermostat housing (5).
2. Install the radiator inlet hose clamp (4).
3. Install the radiator inlet hose (3) to the radiator (1).
4. Install the radiator inlet hose clamp (2).
5. Lower the vehicle.
6. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Clip in the engine control module, if necessary.
8. Connect the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .

Scheme 3

Radiator Outlet Hose Replacement (1.4L LUV)

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)
2. Loosen the hose clamp (1).
3. Remove the radiator outlet hose assembly (3) from the water pump.
4. Unclip the clamp (2).
5. Remove the radiator outlet hose assembly (3) from the radiator.
6. Loosen the clamp (3).
7. Remove the radiator outlet hose (1) from the radiator surge tank outlet hose (2).
8. Unclip the radiator outlet hose (1) from the 2 clips (4).

1. Clip in the radiator outlet hose (1) into the 2 clips (4).
2. Install the radiator outlet hose (1) to the radiator surge tank outlet hose (2).
3. Install the clamp (3).
4. Install the radiator surge tank outlet hose assembly (3) to the radiator.
5. Clip in the clamp (2).
6. Install the radiator surge tank outlet hose assembly (3) to the water pump.
7. Install the hose clamp (1).
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)

Repair Procedure

1. Pressure test the cooling system. Refer to «Cooling System Leak Testing»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-leak-testing) . If the radiator is not leaky, perform the following procedure.
2. Remove the radiator. Refer to «Radiator Replacement (1.4L LUV with Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.4L LUV with Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Grind the fracture surface (1) with a proper tool.
4. Drill a hole in the center of the fractured surface, using a 6 mm (0.24 in) drill.
5. Install the new radiator mounting pin (2). Install the nut (3). NOTE: The bolt should not be longer than 35 mm (1.38 in). Install the radiator mounting pin (2) with the bolt (1).
6. Tighten the bolt 5 N.m (44 lb in).
7. Install the radiator. Refer to «Radiator Replacement (1.4L LUV with Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.4L LUV with Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Disconnect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bumpers-and-fascias) .
3. Remove the radiator upper air seal.
4. Remove the left and right side radiator air baffles.
5. Remove the charge air cooler inlet air hose from the charge air cooler. Refer to «Charge Air Cooler Inlet Air Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
6. Remove the charge air cooler outlet air hose from the charge air cooler. Refer to «Charge Air Cooler Outlet Air Hose Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Charge Air Cooler Outlet Air Hose Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
7. Unclip the transmission fluid cooler (1) from the radiator.
8. Reposition the transmission fluid cooler (1) away from the radiator and secure.
9. Unclip the air conditioning condenser (2) from the charge air cooler (1).
10. Reposition the air conditioning condenser (2) forward and below the front bumper impact bar.
11. Unclip the charge air cooler (2) from the radiator (1).
12. Lift the charge air cooler (2) up and away from the radiator (1).

1. Clip the charge air cooler (2) to the radiator (1).
2. Clip the air conditioning condenser (2) to the charge air cooler (1).
3. Clip the transmission fluid cooler (1) to the radiator.
4. Install the charge air cooler inlet air hose to the charge air cooler. Refer to «Charge Air Cooler Inlet Air Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
5. Install the charge air cooler outlet air hose to the charge air cooler. Refer to «Charge Air Cooler Outlet Air Hose Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Charge Air Cooler Outlet Air Hose Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
6. Install the left and right side radiator air baffles.
7. Install the radiator upper air seal.
8. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bumpers-and-fascias) .
9. Connect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .

1. Disconnect the battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bumpers-and-fascias) .
3. Remove the radiator upper air seal.
4. Remove the left and right side radiator air baffles.
5. Remove the charge air cooler inlet air hose from the charge air cooler. Refer to «Charge Air Cooler Inlet Air Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
6. Remove the charge air cooler outlet air hose from the charge air cooler. Refer to «Charge Air Cooler Outlet Air Hose Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Charge Air Cooler Outlet Air Hose Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
7. Unclip the air conditioning condenser (2) from the charge air cooler (1).
8. Reposition the air conditioning condenser (2) forward and below the front bumper impact bar.
9. Unclip the charge air cooler (2) from the radiator (1).
10. Lift the charge air cooler (2) up and away from the radiator (1).

1. Clip the charge air cooler (2) to the radiator (1).
2. Clip the air conditioning condenser (2) to the charge air cooler (1).
3. Install the charge air cooler inlet air hose to the charge air cooler. Refer to «Charge Air Cooler Inlet Air Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
4. Install the charge air cooler outlet air hose to the charge air cooler. Refer to «Charge Air Cooler Outlet Air Hose Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Charge Air Cooler Outlet Air Hose Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
5. Install the left and right side radiator air baffles.
6. Install the radiator upper air seal.
7. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bumpers-and-fascias) .
8. Connect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .

Radiator and Charge Air Cooler Bracket Repair

1. Remove the radiator. Refer to «Radiator Replacement (1.4L LUV with Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.4L LUV with Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Drill hole in the charge air cooler bracket and radiator bracket (2) using a 7 mm (0.28 in) drill.
3. Install the j-clip (3) to the radiator.
4. Install the radiator. Refer to «Radiator Replacement (1.4L LUV with Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Replacement (1.4L LUV with Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the repair bolt (1) with locking compound and tighten to 5 N.m (45 lb in).

Scheme 4

Radiator Lower Bracket Replacement

Scheme 5

Engine Coolant Fan Resistor Mount Repair

1. Open the hood.
2. Place a collection basin under the vehicle.
3. Disconnect the throttle body heater inlet hose connector from the engine coolant thermostat housing (1).
4. Loosen the clamp and disconnect the throttle body heater inlet hose connector from the throttle body (3).
5. Remove the throttle body heater inlet hose (2).

1. Install the throttle body heater inlet hose (2).
2. Connect the throttle body heater inlet hose to the throttle body (3) and install the clamp.
3. Connect the throttle body heater inlet hose (2) to the engine coolant thermostat housing (1).
4. Top off the coolant by filling to the bottom line (black arrow) on the coolant surge tank (1) if necessary.
5. Close the hood.

1. Open the hood.
2. Place a collection basin under the vehicle.
3. Clip out the throttle body heater outlet hose from the intake manifold.
4. Loosen the clamp and disconnect the throttle body heater outlet hose (2) from the radiator surge tank (1).
5. Disconnect the throttle body heater outlet hose connector from the throttle body (3).
6. Remove the throttle body heater outlet hose (2).

1. Install the throttle body heater outlet hose (2).
2. Connect the throttle body heater outlet hose connector to the throttle body (3)
3. Connect the throttle body heater outlet hose (2) to the radiator surge tank (1) and install the clamp.
4. Clip in the throttle body heater outlet hose to the intake manifold
5. Top off the coolant by filling to the bottom line (black arrow) on the coolant surge tank (1), if necessary.
6. Close the hood.

1. Disconnect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Drain engine coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)
3. Remove the turbocharger oil feed pipe. Refer to «Turbocharger Oil Feed Pipe Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
4. Remove the warm up three way catalytic converter. Refer to «Warm Up Three-Way Catalytic Converter Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .
5. Lower vehicle.
6. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
7. Remove the oil cooler outlet hose clamp (2).
8. Remove the oil cooler outlet hose (3) from the thermostat housing (1).
9. Remove the turbocharger coolant return pipe bolt (1) from the oil cooler housing.
10. Remove the turbocharger coolant return pipe clamp (2).
11. Remove the turbocharger coolant return pipe (3) from the oil cooler inlet pipe.
12. Disconnect the oil pressure indicator switch wiring harness plug.
13. Remove the oil cooler inlet hose clamp (1) and remove the oil cooler inlet hose from the water outlet.
14. Remove the engine oil cooler bolt (5).
15. Remove the engine oil cooler inlet pipe bolt (4).
16. Remove the engine oil cooler inlet pipe (2) and the seal ring (3).
17. Raise vehicle.
18. Remove the oil cooler outlet pipe bolt (1) from the engine block.
19. Remove the oil cooler outlet pipe (2) in compound with the oil cooler outlet hose.
20. Lower vehicle.
21. Remove the 2 oil cooler bolts (1).
22. Raise vehicle.
23. Remove the oil cooler (1) in compound with the oil cooler gasket (2) and the seal ring (3).
24. Remove the oil pressure indicator switch from the oil cooler.

1. Install the oil pressure indicator switch to the oil cooler. Use a NEW seal ring.
2. Tighten the oil pressure indicator switch to 20 N.m (15 lb ft).
3. Clean the sealing surfaces.
4. Install the oil cooler (1) in compound with a NEW oil cooler gasket (2) and a NEW seal ring (3).
5. Lower vehicle.
6. Install the 2 oil cooler bolts (1) and hand tighten.
7. Install the engine oil cooler inlet pipe (2) in compound with a NEW seal ring (3).
8. Install the oil cooler inlet hose to the water outlet and install the oil cooler inlet hose clamp (1).
9. Install the engine oil cooler bolt (5).
10. Install the engine oil cooler inlet pipe bolt (4) and tighten to 10 N.m (89 lb in).
11. Tighten the 3 engine oil cooler bolts to 20 N.m (15 lb ft).
12. Install the turbocharger coolant return pipe (3) to the oil cooler inlet pipe.
13. Install the turbocharger coolant return pipe clamp (2).
14. Install turbocharger coolant return pipe bolt (1) and tighten to 10 N.m (89 lb in).
15. Connect the oil pressure indicator switch wiring harness plug.
16. Raise vehicle.
17. Install the oil cooler outlet pipe (2) in compound with the oil cooler outlet hose to the oil cooler.
18. Install the oil cooler outlet pipe bolt (1) to the engine block and tighten to 10 N.m (89 lb in).
19. Install the warm up three way catalytic converter. Refer to «Warm Up Three-Way Catalytic Converter Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .
20. Install the oil cooler outlet hose (3) to the thermostat housing (1).
21. Install the oil cooler outlet hose clamp (2).
22. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
23. Install the turbocharger oil feed pipe and the exhaust manifold heat shield. Refer to «Turbocharger Oil Feed Pipe Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
24. Connect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
25. Fill engine coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

Engine Oil Cooler Replacement (1.8L LUW and LWE)

1. Remove the exhaust manifold. Refer to «Exhaust Manifold Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .
2. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the 2 engine oil cooler outlet pipe bolts (1).
4. Remove the engine oil cooler outlet pipe (2) from the engine oil cooler housing and the engine coolant thermostat housing.
5. Remove the 2 engine oil cooler outlet pipe gaskets.
6. Remove the 5 engine oil cooler housing bolts (2).
7. Remove the engine oil cooler housing (1).
8. Remove the 2 engine oil cooler housing gaskets.
9. Remove the engine oil cooler inlet pipe (3).
10. Remove the 2 engine oil cooler inlet pipe gaskets.
11. Remove the 6 engine oil cooler bolts (2) and the engine oil cooler (1) from the engine oil cooler housing.
12. Remove the engine oil cooler gasket.

1. Clean the engine oil cooler to engine oil cooler housing sealing surfaces.
2. Install a NEW engine oil cooler gasket.
3. Install the engine oil cooler (1) to the engine oil cooler housing.
4. Install the 6 engine oil cooler bolts (2) and tighten to 8 N.m (71 lb in).
5. Install the 2 NEW engine oil cooler inlet pipe gaskets.
6. Install the engine oil cooler inlet pipe (3).
7. Install the 2 NEW engine oil cooler housing gaskets.
8. Install the engine oil cooler housing (1).
9. Install the 5 engine oil cooler housing bolts (2) and tighten to 25 N.m (19 lb ft).
10. Clean the engine oil cooler outlet pipe sealing surfaces.
11. Install the 2 NEW engine oil cooler outlet pipe gaskets.
12. Install the engine oil cooler outlet pipe (2) to the engine oil cooler housing and the engine coolant thermostat housing.
13. Install the 2 engine oil cooler outlet pipe bolts (1) and tighten to 8 N.m (71 lb in).
14. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
15. Install the exhaust manifold. Refer to «Exhaust Manifold Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .

1. Disconnect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system)
2. Drain engine coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)
3. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions)
4. Remove the oil cooler outlet hose clamp (2).
5. Remove the oil cooler outlet hose (3) from the thermostat housing (1).
6. Remove the warm up three way catalytic converter. Refer to «Warm Up Three-Way Catalytic Converter Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system)
7. Remove the oil cooler outlet pipe bolt (1) from the engine block.
8. Remove the oil cooler outlet pipe (2) in compound with the oil cooler outlet hose.
9. Remove the oil cooler outlet hose clamp.
10. Remove the oil cooler outlet hose from the oil cooler outlet pipe.

1. Install the oil cooler outlet hose to the oil cooler outlet pipe.
2. Install the oil cooler outlet hose clamp.
3. Install the oil cooler outlet pipe (2) in compound with the oil cooler outlet hose to the oil cooler.
4. Install the oil cooler outlet pipe bolt (1) to the engine block and tighten to 10 N.m (89 lb in).
5. Install the warm up three way catalytic converter. Refer to «Warm Up Three-Way Catalytic Converter Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system)
6. Install the oil cooler outlet hose (3) to the thermostat housing (1).
7. Install the oil cooler outlet hose clamp (2).
8. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions)
9. Install the turbocharger oil feed pipe and the exhaust manifold heat shield. Refer to «Turbocharger Oil Feed Pipe Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv)
10. Connect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system)
11. Fill engine coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)

Scheme 6

Engine Oil Cooler Inlet Hose Replacement

1. Drain coolant fluid. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the warm up three way catalytic converter. Refer to «Warm Up Three-Way Catalytic Converter Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .
3. Remove the engine oil cooler inlet hose from the engine oil cooler inlet pipe. Refer to «Engine Oil Cooler Inlet Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the turbocharger coolant return pipe hose clamp (3).
5. Remove the turbocharger coolant return pipe hose (2) from the engine oil cooler inlet pipe.
6. Remove the turbocharger coolant return pipe bolt (1).
7. Remove the engine oil cooler bolt (1).
8. Remove the engine oil cooler inlet pipe bolt (4).
9. Remove the engine oil cooler inlet pipe (2) and the seal ring (3).

1. Install the engine oil cooler inlet pipe (2) in compound with a NEW seal ring (3).
2. Install the engine oil cooler bolt (1).
3. Install the engine oil cooler inlet pipe bolt (4) and tighten to 10 N.m (89 lb in).
4. Tighten the engine oil cooler bolt (1) to 20 N.m (15 lb ft).
5. Install the turbocharger coolant return pipe hose (2) to the engine oil cooler inlet pipe.
6. Install the turbocharger coolant return pipe hose clamp (3).
7. Install turbocharger coolant return pipe bolt (1) and tighten to 10 N.m (89 lb in).
8. Install the engine oil cooler inlet hose to the engine oil cooler inlet pipe. Refer to «Engine Oil Cooler Inlet Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Install the warm up three way catalytic converter. Refer to «Warm Up Three-Way Catalytic Converter Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .
10. Fill up coolant fluid. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 7

Engine Oil Cooler Inlet Pipe Replacement (1.8L LUW and LWE)

1. Remove the exhaust manifold. Refer to «Exhaust Manifold Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .
2. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the 2 engine oil cooler outlet pipe bolts (1).
4. Remove the engine oil cooler outlet pipe (2) from the engine oil cooler housing and the engine coolant thermostat housing.
5. Remove the 2 engine oil cooler outlet pipe gaskets.

1. Clean the engine oil cooler outlet pipe sealing surfaces.
2. Install the 2 NEW engine oil cooler outlet pipe gaskets.
3. Install the engine oil cooler outlet pipe (2) to the engine oil cooler housing and the engine coolant thermostat housing.
4. Install the 2 engine oil cooler outlet pipe bolts (1) and tighten to 8 N.m (71 lb in).
5. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the exhaust manifold. Refer to «Exhaust Manifold Replacement»(/chevrolet/cruze/i-2012-2015/remont/exhaust/#engine-exhaust-system) .

1. Remove and reposition the front end upper tie bar rearward. Refer to «Front End Upper Tie Bar Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
2. Disconnect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
3. Remove the radiator upper air seal.
4. Remove the left and right side radiator air baffles.
5. Position the radiator assembly forward for engine coolant fan shroud access.
6. Disconnect the engine coolant fan resistor wiring harness connector (1) and remove the ground cable nut.
7. Remove the wiring harness (3) and clips.
8. Unclip the engine coolant fan shroud (1) from the four mounting points shown.
9. Remove the engine coolant fan shroud (1). Slide the engine coolant fan shroud (1) toward the right side of the vehicle. Lift the left hand side of the engine coolant fan shroud (1) up. Remove the engine coolant fan shroud (1) from the vehicle.
10. Remove the engine coolant fan resistor (1) by uncliping the retainer clip (2).
11. Unclip the engine coolant fan resistor wiring harness (arrows) from the shroud.
12. Remove the 3 engine coolant fan engine bolts (3) from the engine coolant fan.
13. Remove the engine coolant fan.

1. Install the engine coolant fan.
2. Install the 3 engine coolant fan engine bolts (3) to the engine coolant fan and tighten.
3. Clip in the engine coolant fan resistor wiring harness (arrows) to the shroud.
4. Install the engine coolant fan resistor (1) by clipping the retainer clip (2).
5. Install the engine coolant fan shroud (1). Lower the right hand side of the engine coolant fan shroud (1) behind the radiator. Slide the engine coolant fan shroud (1) toward the left side of the vehicle.
6. Clip in the engine coolant fan shroud (1) to the four mounting points shown.
7. Connect the engine coolant fan resistor wiring harness connector (1).
8. Install the wiring harness (3) and clips.
9. Install the front end upper tie bar. Refer to «Front End Upper Tie Bar Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
10. Install the left and right side radiator air baffles.
11. Install the radiator upper air seal.
12. Connect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .

1. Disconnect the negative cable from the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Disconnect the engine coolant fan resistor wiring harness plug.
3. Remove the engine coolant fan resistor bolt (2).
4. Remove the engine coolant fan resistor (1).

1. Install the engine coolant fan resistor (1).
2. Install the engine coolant fan resistor bolt (2) and tighten to 4 N.m (36 lb in).
3. Connect the engine coolant fan resistor wiring harness plug.
4. Connect the negative cable to the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .

Scheme 8

Engine Coolant Level Indicator Module Replacement

1. Remove the turbocharger. Refer to «Turbocharger Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
2. Remove the turbocharger coolant feed pipe from quick fitting connector. Refer to «Turbocharger Disassemble»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv__turbocharger-disassemble) .

1. Install the turbocharger coolant feed pipe to the quick fitting connector. Refer to «Turbocharger Assemble»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv__turbocharger-assemble) .
2. Install the turbocharger. Refer to «Turbocharger Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .

1. Remove the turbocharger. Refer to «Turbocharger Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
2. Remove the turbocharger coolant return pipe from quick fitting connector. Refer to «Turbocharger Disassemble»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv__turbocharger-disassemble) .
3. Replace the quick fitting connector. Refer to «Turbocharger Disassemble»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv__turbocharger-disassemble) .

1. Install the turbocharger coolant return pipe to the quick fitting connector. Refer to «Turbocharger Disassemble»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv__turbocharger-disassemble) .
2. Install the turbocharger. Refer to «Turbocharger Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
3. Disconnect the positive crankcase ventilation pipe from the turbocharger. Refer to «Positive Crankcase Ventilation Hose/Pipe/Tube Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
4. Remove the radiator outlet hose from the engine coolant thermostat housing. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Disconnect the engine coolant temperature sensor wiring harness connector.
6. Remove the engine oil cooler outlet hose clamp (2).
7. Remove the engine oil cooler outlet hose (3) from the engine coolant thermostat housing.
8. Remove the 3 engine coolant thermostat housing bolts (4).
9. Remove the engine coolant thermostat housing (5) and the seal ring (1).

1. Clean the sealing surfaces.
2. Install the engine coolant thermostat housing (5) along with a NEW seal ring (1).
3. Install the 3 engine coolant thermostat housing bolts (4) and tighten to 8 N.m(71 lb in).
4. Install the engine oil cooler outlet hose (3) to the engine coolant thermostat housing.
5. Install the engine oil cooler outlet hose clamp (2).
6. Connect the engine coolant temperature sensor wiring harness connector.
7. Install the radiator outlet hose to the engine coolant thermostat housing. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Connect the positive crankcase ventilation pipe to the turbocharger. Refer to «Positive Crankcase Ventilation Hose/Pipe/Tube Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
9. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Open the hood.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/cruze/i-2012-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Place a drain pan below the vehicle.
4. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Loosen the radiator inlet hose clamp (2).
6. Remove the radiator inlet hose (3) from the engine coolant thermostat (1).
7. Remove the throttle body heater inlet hose (2) from the engine coolant thermostat (1).
8. Remove the heater outlet hose from the engine coolant thermostat housing. Refer to «Heater Outlet Hose Replacement (1.8L LUW)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.8L LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
9. Remove the heater inlet hose from the engine coolant thermostat housing. Refer to «Heater Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
10. Remove the thermostat housing bracket nut.
11. Remove the thermostat housing bracket.
12. Disconnect the engine coolant temperature sensor connector (1).
13. Remove the 2 engine oil cooler pipe bolts (6).
14. Remove the engine oil cooler pipe (5).
15. Remove the engine oil cooler pipe seals (4, 7).
16. Remove the 4 engine coolant thermostat housing bolts (3).
17. Remove the thermostat housing (2).
18. Remove the thermostat housing seal (8).

1. Clean sealing surface.
2. Install a NEW engine coolant thermostat housing seal (8).
3. Install the engine coolant thermostat housing (2).
4. Install the 4 engine coolant thermostat housing bolts (3) and tighten to 2 N.m (18 lb in).
5. Tighten the 4 engine coolant thermostat housing bolts to 8 N.m (71 lb in) in sequence (1-2-3-4).
6. Install NEW engine oil cooler pipe seals (4, 7).
7. Install the engine oil cooler pipe (5).
8. Install the 2 engine oil cooler pipe bolts (6) and tighten to 8 N.m (71 lb in).
9. Install the heater inlet hose to the engine coolant thermostat housing. Refer to «Heater Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
10. Install the heater outlet hose to the engine coolant thermostat housing. Refer to «Heater Outlet Hose Replacement (1.8L LUW)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.8L LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
11. Connect the engine coolant temperature sensor connector (1).
12. Install the engine coolant thermostat housing bracket.
13. Install the engine coolant thermostat housing bracket nut and tighten to 6 N.m (53 lb in).
14. Install the throttle body heater inlet hose (2) to the engine coolant thermostat housing (1).
15. Install the radiator inlet hose (3) with the radiator inlet hose clamp (2) to the engine coolant thermostat (1).
16. Lower the vehicle.
17. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/cruze/i-2012-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Place a drain pan below the vehicle.
3. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Loosen the radiator inlet hose clamp (2).
5. Remove the radiator inlet hose (3) from the engine coolant thermostat (1).
6. Remove the 4 engine coolant thermostat bolts (3).
7. Remove the engine coolant thermostat assembly (2).
8. Remove the engine coolant seal (1).

1. Clean the engine coolant sealing surfaces.
2. Install the engine coolant seal (1).
3. Install the engine coolant thermostat assembly (2).
4. Install the 4 engine coolant thermostat bolts (3) and tighten to 8 N.m (71 lb in).
5. Install the radiator inlet hose (3) with the radiator inlet hose clamp (2) to the engine coolant thermostat (1).
6. Lower the vehicle.
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 9

Engine Coolant Air Bleed Hose Replacement (1.4L LUV)

Engine Coolant Air Bleed Hose Replacement (1.8L LUW and LWE)

Note. The engine coolant air bleed hose is the same part like the throttle body heater outlet hose.

Remove and install the engine coolant air bleed hose. Refer to Throttle Body Heater Outlet Hose Replacement .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the charge air cooler outlet air hose from the throttle body. Refer to «Charge Air Cooler Outlet Air Hose Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Charge Air Cooler Outlet Air Hose Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
3. Remove the engine coolant air bleed hose from the water outlet. Refer to «Engine Coolant Air Bleed Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-coolant-air-bleed-hose-replacement) , «Engine Coolant Air Bleed Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the heater inlet hose from the water outlet. Refer to «Heater Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the radiator inlet hose from the water outlet. Refer to «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the engine oil cooler inlet hose from the water outlet. Refer to «Engine Oil Cooler Inlet Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Disconnect the engine coolant temperature sensor (water outlet) wiring harness connector.
8. Remove the 3 water outlet bolts (3).
9. Remove the water outlet (2) and the water outlet seal ring (1).

1. Clean the sealing surfaces.
2. Install the water outlet (2) and a NEW water outlet seal ring (1).
3. Install the 3 water outlet bolts (3) and tighten to 8 N.m (71 lb in).
4. Connect the engine coolant temperature sensor (water outlet) wiring harness connector.
5. Install the engine oil cooler inlet hose to the water outlet. Refer to «Engine Oil Cooler Inlet Hose Replacement»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the radiator inlet hose to the water outlet. Refer to «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Install the heater inlet hose to the water outlet. Refer to «Heater Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Install the engine coolant air bleed hose to the water outlet. Refer to «Engine Coolant Air Bleed Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system__engine-coolant-air-bleed-hose-replacement) , «Engine Coolant Air Bleed Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Install the charge air cooler outlet air hose to the throttle body. Refer to «Charge Air Cooler Outlet Air Hose Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) , «Charge Air Cooler Outlet Air Hose Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .
2. Remove the engine mount bracket. Refer to «Engine Mount Bracket Replacement - Right Side»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
3. Remove the drive belt. Refer to «Drive Belt Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
4. Loosen the 3 water pump pulley bolts (2) while holding the water pump pulley hub with a wrench.
5. Remove the 3 water pump pulley bolts (2).
6. Remove the water pump pulley (1).

1. Install the water pump pulley (1).
2. Install the 3 water pump pulley bolts (2).
3. Tighten the 3 water pump pulley bolts to 22 N.m (16 lb ft) while holding the water pump pulley hub with a wrench.
4. Install the drive belt. Refer to «Drive Belt Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
5. Install the engine mount bracket. Refer to «Engine Mount Bracket Replacement - Right Side»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-14l-luv) .
6. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luv-repair-instructions) .

1. Remove the air cleaner housing. Refer to «Air Cleaner Assembly Replacement (1.8L LWE)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-18l-luw-and-lwe-repair-instructions) , «Air Cleaner Assembly Replacement (1.8L LUW)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-18l-luw-and-lwe-repair-instructions) .
2. Loosen the 3 water pump pulley bolts (1).
3. Remove the drive belt. Refer to «Drive Belt Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-18l-luw-and-lwe) .
4. Remove the 3 water pump pulley bolts (1).
5. Remove the water pump pulley (2) from the water pump (3).

1. Install the water pump pulley (2) to the water pump (3).
2. Install the 3 water pump pulley bolts (1).
3. Install the drive belt. Refer to «Drive Belt Replacement»(/chevrolet/cruze/i-2012-2015/remont/mechanical/#engine-mechanical-18l-luw-and-lwe) .
4. Tighten the 3 water pump pulley bolts (1) to 20 N.m (15 lb ft).
5. Install the air cleaner housing. Refer to «Air Cleaner Assembly Replacement (1.8L LWE)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-18l-luw-and-lwe-repair-instructions) , «Air Cleaner Assembly Replacement (1.8L LUW)»(/chevrolet/cruze/i-2012-2015/remont/testing-diagnostics/#engine-controls-and-fuel-18l-luw-and-lwe-repair-instructions) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the engine coolant thermostat housing from water pump. Refer to «Engine Coolant Thermostat Housing Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the water pump pulley. Refer to «Water Pump Pulley Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Water Pump Pulley Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system)
4. Remove the heater outlet hose from the water pump. Refer to «Heater Outlet Hose Replacement (1.8L LUW)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.8L LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the 5 water pump bolts (4) and the 5 long engine front cover bolts (3).
6. Remove the water pump (2).
7. Remove and DISCARD the water pump gasket (1).

1. Clean the sealing surfaces.
2. The water pump and engine front cover bolts are located as followed: Engine front cover special bolt without cone end 60 mm (2.362 in) (1). Engine front cover standard bolt with cone end 52 mm (2.047 in) (2). Water pump bolt 25 mm (0.984 in) (3).
3. Install the water pump (2) and a NEW water pump gasket (1).
4. Install the 5 water pump bolts (4) and the 5 engine front cover bolts (3) and tighten in a cross sequence to 8 N.m (71 lb in).
5. Install the heater outlet hose from the water pump. Refer to «Heater Outlet Hose Replacement (1.8L LUW)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (1.8L LWE)»(/chevrolet/cruze/i-2012-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
6. Install the water pump pulley. Refer to «Water Pump Pulley Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Water Pump Pulley Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Install the engine coolant thermostat housing to the water pump. Refer to «Engine Coolant Thermostat Housing Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the water pump pulley. Refer to «Water Pump Pulley Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Water Pump Pulley Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the 5 water pump bolts (2).
4. Remove the water pump (1).
5. Remove and DISCARD the water pump seal ring.

1. Clean the 5 water pump threads.
2. Clean the water pump sealing surface.
3. Insert a NEW water pump seal ring.
4. Install the water pump (1).
5. Install the 5 water pump bolts (2) and tighten to 8 N.m (71 lb in).
6. Install the water pump pulley. Refer to «Water Pump Pulley Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Water Pump Pulley Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Refill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove and reposition the front end upper tie bar rearward. Refer to «Front End Upper Tie Bar Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
2. Disconnect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
3. Remove the radiator upper air seal.
4. Remove the left and right side radiator air baffles.
5. Position the radiator assembly forward for engine coolant fan shroud access.
6. Disconnect the engine coolant fan resistor wiring harness plug (1) and remove the ground cable nut.
7. Remove the wiring harness (3) and clips.
8. Unclip the engine coolant fan shroud (1) at the four mounting points shown.
9. Remove the engine coolant fan shroud (1). Slide the engine coolant fan shroud (1) toward the right side of the vehicle. Lift the left hand side of the engine coolant fan shroud (1) up. Remove the engine coolant fan shroud (1) from the vehicle.

1. Install the engine coolant fan shroud (1). Lower the right hand side of the engine coolant fan shroud (1) behind the radiator. Slide the engine coolant fan shroud (1) toward the left side of the vehicle.
2. Clip in the engine coolant fan shroud (1) at the four mounting points shown.
3. Connect the engine coolant fan resistor wiring harness connector (1).
4. Install the wiring harness (3) and clips.
5. Install the front end upper tie bar. Refer to «Front End Upper Tie Bar Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
6. Install the left and right side radiator air baffles.
7. Install the radiator upper air seal.
8. Connect battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .

1. Remove the charge air cooler. Refer to «Charge Air Cooler Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Charge Air Cooler Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Disconnect the radiator outlet hose and the radiator inlet hose from the radiator. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the transmission fluid cooler inlet pipe from the radiator. Refer to «Transmission Fluid Cooler Inlet Pipe Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
5. Remove the transmission fluid auxiliary cooler pipe. Refer to «Transmission Fluid Cooler Hose/Pipe Replacement»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
6. Use care and lay the transmission fluid cooler aside. Fix it in a suitable position so that the radiator is easy accessible.
7. Unclip the engine coolant fan shroud from the radiator.
8. Remove the 2 radiator upper bracket bolts (1) and the 2 radiator upper brackets (2).
9. Remove the radiator (1) from the 2 lower brackets (2).
10. Use care and rotate the radiator in order to gain more access for the removal.
11. Use care and lift the radiator up and away from the vehicle.

1. Use care and install the radiator (1).
2. Use care and rotate the radiator in order to get more access for the installation.
3. Install the radiator (1) to the 2 lower brackets (2).
4. Install the 2 radiator upper brackets (2).
5. Install the 2 radiator upper bracket bolts (1) and tighten to 22 N.m (16 lb ft).
6. Clip the engine coolant fan shroud to the radiator.
7. Install the transmission fluid auxiliary cooler pipe. Refer to «Transmission Fluid Cooler Hose/Pipe Replacement»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
8. Install the transmission fluid cooler inlet pipe to the radiator. Refer to «Transmission Fluid Cooler Inlet Pipe Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
9. Connect the radiator outlet hose and the radiator inlet hose to the radiator. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
10. Fill and bleed the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
11. Install the charge air cooler. Refer to «Charge Air Cooler Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Charge Air Cooler Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Remove the charge air cooler. Refer to «Charge Air Cooler Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Charge Air Cooler Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Disconnect the radiator outlet hose and the radiator inlet hose from the radiator. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Unclip the engine coolant fan shroud from the radiator.
5. Remove the 2 radiator upper bracket bolts (1) and the 2 radiator upper brackets (2).
6. Remove the radiator (1) from the 2 lower brackets (2).
7. Use care and rotate the radiator in order to gain more access for the removal.
8. Use care and lift the radiator up and away from the vehicle.

1. Use care and install the radiator (1).
2. Use care and rotate the radiator in order to get more access for the installation.
3. Install the radiator (1) to the 2 lower brackets (2).
4. Install the 2 radiator upper brackets (2).
5. Install the 2 radiator upper bracket bolts (1) and tighten to 22 N.m (16 lb ft).
6. Clip the engine coolant fan shroud to the radiator.
7. Connect the radiator outlet hose and the radiator inlet hose to the radiator. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Fill and bleed the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Install the charge air cooler. Refer to «Charge Air Cooler Replacement (Automatic Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Charge Air Cooler Replacement (Manual Transmission)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Disconnect the battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bumpers-and-fascias) .
3. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the front intake air duct deflector.
5. Remove the front intake air duct bolt (2).
6. Remove the front intake air duct (1).
7. Remove the radiator grill support. Refer to «Front Grille Support Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
8. Disconnect and unclip the A/C pressure sensor wiring harness (1).
9. Remove the 2 protector fenders (2) from the charge air cooler (1).
10. Disconnect the radiator outlet hose and the radiator inlet hose from the radiator. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
11. If equipped, remove the transmission fluid cooler inlet pipe from the radiator. Refer to «Transmission Fluid Cooler Inlet Pipe Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
12. If equipped, remove the transmission fluid cooler outlet pipe from the radiator. Refer to «Transmission Fluid Cooler Outlet Pipe Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
13. Unclip the engine coolant fan shroud from the radiator.
14. Remove the 2 radiator upper bracket bolts (1) and the 2 radiator upper brackets (2).
15. Remove the radiator (1) from the 2 lower brackets (2).
16. Use care and rotate the radiator in order to gain more access for the removal.
17. Use care and lift the radiator up and away from the vehicle.

1. Use care and install the radiator (1).
2. Use care and rotate the radiator in order to get more access for the installation.
3. Install the radiator (1) to the 2 lower brackets (2).
4. Install the 2 radiator upper brackets (2).
5. Install the 2 radiator upper bracket bolts (1) and tighten to 22 N.m (16 lb ft).
6. Clip the engine coolant fan shroud to the radiator.
7. Connect the radiator outlet hose and the radiator inlet hose to the radiator. Refer to «Radiator Outlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Outlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , and «Radiator Inlet Hose Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Radiator Inlet Hose Replacement (1.8L LUW and LWE)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .
8. If equipped, install the transmission fluid cooler inlet pipe to the radiator. Refer to «Transmission Fluid Cooler Inlet Pipe Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
9. If equipped, install the transmission fluid cooler outlet pipe to the radiator. Refer to «Transmission Fluid Cooler Outlet Pipe Replacement (1.4L LUV)»(/chevrolet/cruze/i-2012-2015/remont/automatic-trans/#automatic-transmission-6t306t40-repair-instructions-on-vehicle) .
10. Install the 2 protector fenders (2) to the charge air cooler (1).
11. Connect and clip in the A/C pressure sensor wiring harness (1).
12. Install the radiator grill support. Refer to «Front Grille Support Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
13. Install the front intake air duct (1).
14. Install the front intake air duct bolt (2).
15. Install the front intake air duct deflector.
16. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/chevrolet/cruze/i-2012-2015/remont/exterior-body-panels/#bumpers-and-fascias) .
17. Connect the battery negative cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/cruze/i-2012-2015/remont/charging-system/#battery-charging-system-and-starting-system) .
18. Fill and bleed the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE-47716 Fill)»(/chevrolet/cruze/i-2012-2015/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 10

Radiator Support Bracket Replacement

Cooling Fan Description and Operation

The engine cooling fan system is composed of one cooling fan, a series of 5 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes two resistors. This combination of components enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.

Low Speed Operation

The ECM applies ground at the FAN 1 control circuit for the coil side of the cooling fan relay. The energized cooling fan relay completes a ground, through the switch side of the relay, for the coils of the cooling fan low speed relay and the cooling fan speed control relay. The speed control relay activates and supplies B+ to the coil side of the cooling fan high speed relay. The high speed relay remains inactive because the ECM is not commanding the FAN 2 control circuit ON. The energized low speed relay switch closes to supply B+ through the internal low speed resistor of the engine cooling fan motor. The result is cooling fan operation at a reduced speed.

Medium Speed Operation

The ECM applies ground at the FAN 2 control circuit for the coil side of the cooling fan high speed, and medium speed relays. The high speed relay remains inactive because the ECM is not commanding the FAN 1 control circuit ON. The energized medium speed relay switch closes to supply B+ through the internal medium speed resistor of the engine cooling fan motor. The result is cooling fan operation at a medium speed.

High Speed Operation

The ECM applies ground at the FAN 1 control circuit for the coil side of the cooling fan relay. The energized cooling fan relay completes a ground, through the switch side of the relay, for the coil of the cooling fan speed control relay. The energized speed control relay switch closes to supply B+ to the coil side of cooling fan high speed relay. Simultaneously, 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 fans internal resistors. The result is cooling fan operation at full speed.

The cooling systems 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. Refer to the following illustration for the components in the system and the basic flow path of the coolant.

Scheme 11

Note. See arrows for coolant flow order.

The cooling system consists of the following components

1. Heater (1)
2. Surge Tank (2)
3. Water Outlet (3)
4. Engine Oil Cooler (4)
5. Cooling Fan (5)
6. Radiator (6)
7. Turbocharger (7)
8. Engine Coolant Thermostat (8)
9. Engine Block (9)
10. Water Pump (10)

Scheme 12

Water pump is a component of the engine cooling system and circulated the coolant from each cooling circuit components. This water pump consists of sealing, bearing, pulley (1) and housing (2) and is driven by the drive belt to loose noise to water pump pulley. Water pump apply drain hole cup to cap to prevent coolant leakage for customers. Water pump is not open impeller type but closed plastic impeller type (3) to increase the cooling efficiency.

Scheme 13

The Thermostat is a regular part of the Thermostat Housing (1). The thermostat controls coolant flowing. It is a grid controlled electronic wax pellet type. By coolant temperature and / or applying current, the wax-pellet of the thermostat is molten what leads to the opening of the thermostat. That allows the coolant to flow through the radiator. The electronic heating of the thermostat is controlled by the engine control unit. The thermostat begins to open with 0V at 103°C (217°F) and with 12V at 80°C (176°F). It is fully open at 117°C (243°F). Whether the thermostat opening is supported by the electronic heating or not depends on load conditions which are defined as parameters in the grid.

Radiator

The radiator is a heat exchanger. It consists of a core and 2 tanks. The aluminum core is a tube and fin cross-flow 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 tanks are a molded, high temperature, nylon reinforced plastic material. A high temperature rubber gasket seals the tank flange edge to the aluminum core. The tanks are clamped to the core with clinch tabs. The tabs are part of the aluminum header at each end of the core. The radiator also has a drain cock located in the bottom of the left hand tank. 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.

Surge Tank

The surge tank is a plastic tank with a threaded pressure cap. The tank is mounted at a point higher than all other coolant passages. The surge tank provides an air space in the cooling system that allows the coolant to expand and contract. The surge tank provides a coolant fill point and a central air bleed location. During vehicle use, the coolant heats and expands. The increased coolant volume flows into the surge tank. As the coolant circulates, any air is allowed to bubble out. Coolant without air bubbles absorbs heat much better than coolant with bubbles.

Cooling Fan

The cooling fan is mounted behind the radiator in the engine compartment. The engine cooling fan is driven by electric power. The cooling fan draws air through the radiator to improve the transfer of heat from the coolant to the atmosphere. As the fan blades spin, they increase the flow of air across the radiator core and across the condenser on air condition (A/C) equipped vehicles. This helps to speed cooling when the vehicle is at idle or moving at low speeds.

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.

Scheme 14

Note. See arrows for coolant flow order. Notice the port between cylinder head and thermostat housing, as well as the port between cylinder block and water pump.

The cooling system consists of the following components

1. Throttle Body (1)
2. Heater (2)
3. Surge Tank (3)
4. Engine Coolant Thermostat Housing (4)
5. Radiator (5)
6. Cooling Fan (6)
7. Engine Oil Cooler Housing (7)
8. Water Pump (8)
9. Cylinder Head / Cylinder Block (9)

Scheme 15

Water pump is a component of the engine cooling system and circulated the coolant from each cooling circuit components. This water pump consists of sealing, bearing, pulley (3) and housing (2) and is driven by the crankshaft with the back of timing belt to loose noise to water pump pulley. Water pump apply drain hole cup to cap to prevent coolant leakage for customers. Water pump is not open impeller type but closed plastic impeller type to increase the cooling efficiency.

Scheme 16

Thermostat controls the flow of coolant and is mounted to the cylinder head. The thermostat contains a wax pellet (7) that expands and contracts based on the coolant temperature, which will mechanically move the main spring and a sealing disc to control the flow of coolant. The thermostat will begins to open electrically at 90°C (194°F) and will fully open mechanically at 105°C (221°F).

The radiator is a heat exchanger. It consists of a core and 2 tanks. The aluminum core is a tube and fin cross-flow 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 tanks are a molded, high temperature, nylon reinforced plastic material. A high temperature rubber gasket seals the tank flange edge to the aluminum core. The tanks are clamped to the core with clinch tabs. The tabs are part of the aluminum header at each end of the core. The radiator also has a drain cock located in the bottom of the left hand tank. 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.

The surge tank is a plastic tank with a threaded pressure cap. The tank is mounted at a point higher than all other coolant passages. The surge tank provides an air space in the cooling system that allows the coolant to expand and contract. The surge tank provides a coolant fill point and a central air bleed location. During vehicle use, the coolant heats and expands. The increased coolant volume flows into the surge tank. As the coolant circulates, any air is allowed to bubble out. Coolant without air bubbles absorbs heat much better than coolant with bubbles.

The cooling fans are mounted behind the radiator in the engine compartment. The engine cooling fan is driven by electric power. The cooling fan draws air through the radiator to improve the transfer of heat from the coolant to the atmosphere. As the fan blades spin, they increase the flow of air across the radiator core and across the condenser on air condition (A/C) equipped vehicles. This helps to speed cooling when the vehicle is at idle or moving at low speeds.

Illustration Tool Number / Description EN-471 KM-471 GE-42401-A Adapter GE-26568 J 26568 Coolant and Battery Fluid Tester BO-42220 J-42220 Universal 12V Leak Detection Lamp GE-42401-A J 42401 Radiator Cap/Surge Tank Tester Adapter GE 47716 Vac N Fill Coolant Refill Tool EN-6327-A KM-6327-A GE-42401-A Cooling System Test Adapter

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Engine Coolant Temperature Sensor Replacement (Radiator)
• Engine Control Module Replacement
• Diagnostic Trouble Code (DTC) List - Vehicle
• Electrical Center Identification Views
• Relay Replacement (Within an Electrical Center)
• Moving Parts and Hot Surfaces Warning
• Approximate Fluid Capacities
• Heater Core Replacement
• Lifting and Jacking the Vehicle
• Battery Negative Cable Disconnection and Connection
• Fastener Caution
• Front Bumper Fascia Replacement
• Turbocharger Oil Feed Pipe Replacement
• Warm Up Three-Way Catalytic Converter Replacement
• Front End Upper Tie Bar Replacement
• Turbocharger Disassemble
• Turbocharger Assemble
• Engine Coolant Thermostat Housing Caution
• Air Cleaner Assembly Replacement (1.8L LWE)
• Drive Belt Replacement
• Transmission Fluid Cooler Inlet Pipe Replacement (1.4L LUV)
• DTC P00B3 or P00B4
• Temperature Versus Resistance
• Loss of Coolant
• Cooling Fan Description and Operation
• Engine Overheating
• Thermostat Diagnosis (1.8L LUW and LWE)
• Thermostat Diagnosis (1.4L LUV)
• Engine Fails To Reach Normal Operating Temperature
• Coolant System Flushing
• Cooling System Leak Testing
• Engine Oil Cooler Replacement (1.8L LUW and LWE)
• Engine Coolant Air Bleed Hose Replacement (1.8L LUW and LWE)