Engine Cooling System Chevrolet Captiva I рестайлинг 2

Fastener Tightening Specifications

Fastener Tightening Specifications

Adhesives, Fluids, Lubricants and Sealers

Adhesives, Fluids, Lubricants and Sealers

Scheme 1

Scheme 2

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The engine cooling fan system is composed of one cooling fan, 2 relays, the engine control module (ECM) and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. The cooling fan resistor may be a stand alone component or a part of the cooling fan motor and harness assembly. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. Each driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground or shorted to a voltage by monitoring the feedback voltage. The ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.

Conditions for Running the DTC

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

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

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

Conditions for Clearing the MIL/DTC

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

Diagnostic Aids

1. The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
2. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at low speed. Cooling Fan Relay 2 operates the fan at a high speed.
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

Reference Information

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/captiva/i-2-2013-2016/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/captiva/i-2-2013-2016/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (LEA) , Cooling Fan Description and Operation (LFW)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/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 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. If a click is heard or felt at each of the relays
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. If the DTC does not set
5. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the cooling fan relays listed below: KR20C Cooling Fan Low 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: KR20C Cooling Fan Low Speed Relay terminal 86 KR20D Cooling Fan High Speed Relay terminal 86 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 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: KR20C Cooling Fan Low Speed Relay terminal 86 KR20D Cooling Fan High Speed Relay terminal 86 If less than infinite resistance, repair the short to ground in the circuit. If infinite resistance, test all of the appropriate 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: KR20C Cooling Fan Low Speed Relay terminal 85 KR20D Cooling Fan High Speed Relay terminal 85
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 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 cooling fan relay.

Component Testing

1. Ignition OFF.
2. Disconnect a cooling fan relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. If less than 70 ohms or greater than 110 ohms Replace the cooling fan relay. If between 70-110 ohms
4. Test for infinite resistance between 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 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 cooling fan relay. If less than 2 ohms
8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/chevrolet/captiva/i-2-2013-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

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

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

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

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

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

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/captiva/i-2-2013-2016/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/captiva/i-2-2013-2016/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (LFW)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/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 fans ON and OFF with a scan tool. If a click is not heard or felt at one or more of the relays Refer to Circuit/System Testing If a click is heard or felt at each of the relays
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 If the DTC does not set
5. All OK.

1. Ignition OFF, disconnect all of the cooling fan relays. Ignition ON.
2. Verify that a test lamp illuminates between ground and a relay coil ignition circuit terminal listed below: KR20C Cooling Fan Low Speed Relay terminal 86/1 KR20D Cooling Fan High Speed Relay terminal 86/1 KR20E Cooling Fan Speed Control Relay terminal 86/1 If the test lamp does not illuminate Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Remove the test lamp. Test for less than 2 ohms in the ignition circuit of the appropriate 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. Remove the test lamp. Test for infinite resistance between the appropriate cooling fan relay ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance test or replace the appropriate cooling fan relay. If the test lamp illuminates
3. Ignition ON.
4. Connect a DMM, set on the diode setting, between ground and a relay control circuit terminal listed below: KR20C cooling fan low speed relay terminal 85/2 KR20D cooling fan high speed relay terminal 85/2 KR20E cooling fan speed control relay terminal 85/2
5. Verify the DMM reading is greater than 2.5 V or displays O.L with the cooling fan relays commanded OFF with a scan tool. If 2.5 V or less Ignition OFF, 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 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 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 appropriate 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 cooling fan relay.

1. Ignition OFF.
2. Disconnect a cooling fan relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. If less than 70 ohms or greater than 110 ohms Replace the cooling fan relay. If between 70-110 ohms
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 OR 3 and 2 3 and 5 3 and 1 1 and 5 If less than infinite resistance Replace the cooling fan relay. If infinite resistance
5. Test for less than 2 ohms between KR20E Cooling Fan Speed Control Relay terminals 30/3 and 87A/4. If 2 ohms or greater Replace the KR20E Cooling Fan Speed Control Relay. If less than 2 ohms
6. Install a 20 A fused jumper wire between relay terminal 85 or 2 and 12 V.
7. Install a jumper wire between relay terminal 86 or 1 and ground.
8. Test for less than 2 ohms between terminals 3/30 and 5/87. If 2 ohms or greater Replace the cooling fan relay. If less than 2 ohms
9. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/chevrolet/captiva/i-2-2013-2016/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/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses the engine coolant temperature sensor to monitor the engine for an over-temperature condition. This condition occurs when the coolant temperature is above a calibrated value. The ECM will alternately disable 2 groups of cylinders by turning OFF the fuel injectors. By switching between the 2 groups of cylinders, the ECM is able to reduce the temperature of the coolant.

1. The engine is operating for greater than 30 seconds.
2. DTC P1258 runs continuously once the conditions above have been met.

The ECM detects that engine coolant temperature is warmer than 132°C (270°F) for 2 seconds or greater.

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

DTC P1258 is a Type A DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

1. «Cooling Fan Description and Operation (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-fan-description-and-operation-lea) , «Cooling Fan Description and Operation (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-fan-description-and-operation-lfw)
2. «Instrument Cluster Description and Operation»(/chevrolet/captiva/i-2-2013-2016/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
3. «Indicator/Warning Message Description and Operation»(/chevrolet/captiva/i-2-2013-2016/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

K20 Engine Control Module: Scan Tool Information (LEA or LFW) for scan tool information

1. Ignition ON.
2. Verify DTC P0480, P0691 or P0692 is not set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no DTCs is set
3. Verify the cooling fan operates at each available speed as commanded with a scan tool. Cooling fan does not operate Refer to «Cooling Fan Inoperative (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling Fan Inoperative (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) . Cooling fan operates
4. Verify that the engine does not overheat. Engine overheats Refer to «Engine Overheating»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating) . Engine does not overheat
5. Operate the vehicle within the conditions that the customer experienced and verify the DTC does not set. If the DTC sets Refer to «Symptoms - Engine Cooling»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If the DTC does not set
6. All OK

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Important Preliminary Inspections Before Starting

Before using the Symptom diagnosis, perform the following

1. Perform «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) and verify all of the following items: Ensure that the engine control module (ECM) and indicator lamp are operating correctly. Ensure that there are no diagnostic trouble codes (DTCs) that are stored. Scan tool data is within a normal operating range. Refer to «Control Module References»(/chevrolet/captiva/i-2-2013-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for scan tool information.
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 system operation in order to familiarize yourself with the system functions. Refer to Cooling Fan Description and Operation (LEA) , Cooling Fan Description and Operation (LFW) .

Visual/Physical Inspection

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

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

Identifying Intermittent Conditions

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

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

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

Symptom List

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

1. «Cooling Fan Always On (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling Fan Always On (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Cooling Fan Inoperative (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling Fan Inoperative (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)
3. «Engine Overheating»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__engine-overheating)
4. «Loss of Coolant»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant)
5. «Thermostat Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis)
6. «Coolant Heater Inoperative»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)
7. «Engine Fails To Reach Normal Operating Temperature»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__engine-fails-to-reach-normal-operating)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

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

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a low speed Cooling Fan Relay 2 operates one 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.

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/captiva/i-2-2013-2016/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/captiva/i-2-2013-2016/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (LEA)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/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 any of the DTCs are set Refer to «DTC P0480, P0481, P0691, P0692, P0693 or P0694 (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If none of the DTCs are set
3. Verify the scan tool parameters listed below display OFF: Cooling Fan Relay 1 Command Cooling Fan Relays 2 Command If a scan tool parameter displays ON Refer to Diagnostic Aids and «Symptoms - Engine Cooling»(/chevrolet/captiva/i-2-2013-2016/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 a fan is operating Refer to Circuit/System Testing. If the fan is OFF
5. All OK.

Cooling Fan Always ON

1. Ignition OFF, disconnect the KR20C Cooling Fan Low Speed Relay and KR20D Cooling Fan High Speed Relay one at a time, ignition ON.
2. Verify that the cooling fan is OFF. If the cooling fan is ON after both relays are removed Ignition OFF, disconnect the harness connector at the G10R Cooling Fan Motor, ignition ON. Test for less than 1 V between the appropriate output control circuit terminal 87 and ground. If 1 V or greater, repair the short to voltage in the circuit. If the cooling fan is OFF after both relays are removed
3. Test or replace the appropriate cooling fan relay.

1. Ignition OFF.
2. Disconnect a cooling fan relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. If less than 70 ohms or greater than 110 ohms Replace the cooling fan relay. If between 70-110 ohms
4. Test for infinite resistance between 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 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 cooling fan relay. If less than 2 ohms
8. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

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

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a low speed Cooling Fan Relays 2 and 3 operates one fan at a high speed Cooling Fan Relays 1, 2 and 3 operates both fans 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.

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/captiva/i-2-2013-2016/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/captiva/i-2-2013-2016/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (LFW)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/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 (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If no DTC is 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/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) for further diagnosis. If both scan tool parameters display OFF
4. Verify that the fans are not activated. If a fan is operating Refer to Circuit/System Testing. If both fans are OFF
5. All OK

Both Cooling Fans Always ON

1. Ignition OFF, disconnect KR20C Cooling Fan Low Speed Relay, ignition ON.
2. Verify that both cooling fans are OFF. If the cooling fans are ON Ignition OFF, disconnect the harness connector at the G10R Cooling Fan Motor-Right, ignition ON. Test for less than 1 V between KR20C Cooling Fan Low Speed Relay terminal 87/5 and ground. If 1 V or greater, repair the short to voltage in the relay controlled output circuit. If the cooling fans are OFF
3. Test or replace the KR20C Cooling Fan Low Speed Relay.

One Cooling Fan Always ON

1. Ignition OFF, disconnect the KR20D Cooling Fan High Speed Relay, ignition ON.
2. Verify the cooling fan is OFF. If the cooling fan is ON Ignition OFF, disconnect the harness connector at the G10L Cooling Fan Motor-Left, ignition ON. Test for less than 1 V between KR20D Cooling Fan High Speed Relay terminal 87/5 and ground. If 1 V or greater, repair the short to voltage in the relay controlled output circuit. If the cooling fan is OFF
3. Test or replace the KR20D Cooling Fan High Speed Relay.

1. Ignition OFF.
2. Disconnect a KR20 Cooling Fan Relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. If less than 70 ohms or greater than 110 ohms Replace the KR20 cooling fan relay. If between 70-110 ohms
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 OR 3 and 2 3 and 5 3 and 1 1 and 5 If less than infinite resistance Replace the KR20 Cooling Fan Relay. If infinite resistance
5. Test for less than 2 ohms between KR20E Cooling Fan Speed Control Relay terminals 30/3 and 87A/4. If 2 ohms or greater Replace the KR20E Cooling Fan Speed Control Relay. If less than 2 ohms
6. Install a 20 A fused jumper wire between relay terminal 85 or 2 and 12 V.
7. Install a jumper wire between relay terminal 86 or 1 and ground.
8. Test for less than 2 ohms between terminals 3/30 and 5/87. If 2 ohms or greater Replace the KR20 Cooling Fan Relay. If less than 2 ohms
9. 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/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine cooling fan system is composed of one cooling fan, 2 relays, the engine control module (ECM) and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. The cooling fan resistor may be a stand alone component or a part of the cooling fan motor and harness assembly. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. Each driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground or shorted to a voltage by monitoring the feedback voltage. The ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 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/captiva/i-2-2013-2016/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/captiva/i-2-2013-2016/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (LEA)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/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 (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If no DTC is set
3. Verify that the cooling fan operates at low 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. If the cooling fan operates at all speeds
4. All OK.

Inoperative in Both Speeds

1. Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor.
2. Verify that the test lamp illuminates between B+ and ground circuit terminal 1 of the G10 Cooling Fan Motor. 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. Disconnect the KR20D Cooling Fan High Speed Relay, ignition ON
4. Verify a test lamp illuminates between the KR20D Cooling Fan High Speed Relay terminal 30 and ground. 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 KR20D Cooling Fan High Speed Relay terminal 87 and ground: 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
5. Ignition OFF, install the KR20D High Speed Relay, Ignition ON.
6. Command the cooling fan ON at high speed with a scan tool.
7. Verify a test lamp illuminates between the G10 Cooling Fan Motor terminals 2 and ground. If the test lamp does not illuminate Ignition OFF, remove the test lamp. Disconnect the KR20D High Speed Relay. Test for less than 2 ohms between KR20D Cooling Fan High Speed Relay terminal 87 and the G10 Cooling Fan Motor terminal 2. If 2 ohms or greater, repair the open/high resistance in the circuit. If the test lamp illuminates at each terminal
8. Test or replace the G10 Cooling Fan Motor.

Inoperative in Low Speed

1. Disconnect the KR20C Cooling Fan Low Speed relay, ignition ON
2. Verify a test lamp illuminates between ground and the KR20C Cooling Fan Low Speed Relay B+ circuit terminal 30. 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 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, remove the test lamp and disconnect the R10 Cooling Fan Resistor. Test for infinite resistance between the relay circuit terminals listed below and ground: KR20C Cooling Fan Low Speed Relay terminal 87. KR20C Cooling Fan Low Speed Relay terminal 30. If less than infinite resistance, repair the short to ground in the circuit. Replace the fuse as necessary. If the test lamp illuminates
3. Ignition OFF, install the KR20C Cooling Fan Relay. Disconnect R10 Cooling Fan Resistor, Ignition ON.
4. Command the cooling fan ON at low speed with a scan tool.
5. Verify a test lamp illuminates between the R10 Cooling Fan Resistor terminal 1 and ground. If the test lamp does not illuminate Ignition OFF, remove the test lamp. Disconnect the KR20C Cooling Fan Low Speed Relay. Test for less than 2 ohms between KR20C Cooling Fan Low Speed Relay terminal 87 and Cooling Fan Resistor terminal 1. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace KR20C Cooling Fan Low Speed Relay. If the test lamp illuminates
6. Ignition OFF, reconnect the Cooling Fan Resistor and disconnect the harness connector at the G10 Cooling Fan Motor. Ignition ON, Command the cooling fan ON at low speed with a scan tool. Verify a test lamp illuminates between the G10 Cooling Fan Motor terminal 2 and ground. If the test lamp does not illuminate Ignition OFF. Test for less than 2 ohms between the Cooling Fan Resister terminal 3 and G10 Cooling Fan terminal 2, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If the test lamp illuminates
7. Replace the R10 Cooling Fan Resistor.

Inoperative in High Speed

1. Disconnect the KR20D Cooling Fan High Speed Relay, ignition ON
2. Verify a test lamp illuminates between the KR20D Cooling Fan High Speed Relay terminal 30 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 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 illuminates
3. Ignition OFF, install the KR20D Cooling Fan High Speed Relay. Disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON.
4. Command the cooling fan ON at high speed with a scan tool.
5. Verify a test lamp illuminates between the G10 Cooling Fan Motor terminal 2 and ground. If the test lamp does not illuminate Ignition OFF, remove the test lamp. Disconnect the KR20D Cooling Fan High Speed Relay. Test for less than 2 ohms between KR20D Cooling Fan Relay terminal 87 and G10 Cooling Fan Motor terminal 2. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the KR20D Cooling Fan High Speed Relay.

1. Ignition OFF.
2. Disconnect a KR20 Cooling Fan Relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. If less than 70 ohms or greater than 110 ohms Replace the KR20 cooling fan relay. If between 70-110 ohms
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 OR 3 and 2 3 and 5 3 and 1 1 and 5 If less than infinite resistance Replace the KR20 Cooling Fan Relay. If infinite resistance
5. Test for less than 2 ohms between KR20E Cooling Fan Speed Control Relay terminals 30/3 and 87A/4. If 2 ohms or greater Replace the KR20E Cooling Fan Speed Control Relay. If less than 2 ohms
6. Install a 20 A fused jumper wire between relay terminal 85 or 2 and 12 V.
7. Install a jumper wire between relay terminal 86 or 1 and ground.
8. Test for less than 2 ohms between terminals 3/30 and 87/5. If 2 ohms or greater Replace the KR20 Cooling Fan Relay. If less than 2 ohms
9. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans. The engine control module (ECM) uses two fan control circuits and a series of three relays to command the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a low speed Cooling Fan Relays 2 and 3 operates one fan at a high speed Cooling Fan Relays 1, 2 and 3 operates both fans at a high speed

Schematic Reference

Engine Heating/Cooling Schematics

Connector End View Reference

1. «COMPONENT CONNECTOR END VIEWS - INDEX»(/chevrolet/captiva/i-2-2013-2016/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index)
2. «Electrical Center Identification Views»(/chevrolet/captiva/i-2-2013-2016/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)

Description and Operation

Cooling Fan Description and Operation (LFW)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/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 (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If no DTCs is set
3. Verify that both cooling fans turn ON and OFF and operate at low and high speed, when commanding the appropriate cooling fan relays ON and OFF with a scan tool. If a cooling fan does not operate Refer to Circuit/System Testing If both cooling fans operate
4. All OK.

1. Ignition OFF, disconnect all of the KR20 Cooling Fan Relays.
2. Verify a test lamp illuminates between ground and the B+ circuit terminals listed below: KR20C Cooling Fan Low Speed B+ circuit terminal 30/3 KR20D Cooling Fan High Speed B+ circuit terminal 30/3 If the test lamp does not illuminate and the circuit fuse is good Disconnect the appropriate cooling fan fuse. Test for less than 2 ohms between the fuse and the appropriate relay B+ circuit terminal, end to end. If 2 ohms or greater, repair the open/high resistance in the B+ 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 Connect a DMM to the appropriate relay B+ circuit terminal. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the B+ circuit. If infinite resistance Disconnect the harness connector at the appropriate G10 Cooling Fan Motor. Test for infinite resistance between the appropriate relay controlled output circuit terminal 87/5 and ground. KR20C Cooling Fan Low Speed output circuit terminal 87/5 KR20D Cooling Fan High Speed output circuit terminal 87/5 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the appropriate G10 Cooling Fan Motor. If the test lamp illuminates
3. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the G10L Cooling Fan Motor-Left. It may take up to 2 minutes for all vehicle systems to power down.
4. Test for less than 5 ohms between the circuits listed below and ground: G10L Cooling Fan Motor-Left terminal 1 KR20E Cooling Fan Speed Control Relay terminal 87/5 If 5 ohms or greater 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 appropriate 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 less than 5 ohms
5. Connect the harness connector at the G10L Cooling Fan Motor-Left.
6. Connect a 50 A fused jumper between the KR20D Cooling Fan High Speed Relay terminals 30/3 and 87/5.
7. Verify the G10L Cooling Fan Motor-Left is activated at high speed. If the cooling fan does not activate Disconnect the harness connector at the G10L Cooling Fan Motor-Left. Test for less than 2 ohms in the circuit between KR20D Cooling Fan High Speed Relay terminal 87/5 and the G10L Cooling Fan Motor-Left terminal 2. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the G10L Cooling Fan Motor-Left. If the cooling fan activates
8. Connect a fused jumper between the KR20E Cooling Fan Speed Control Relay switch circuit terminal 30/3 and the ground circuit terminal 87/5.
9. Connect a 40 A fused jumper between the KR20C Cooling Fan Low Speed Relay terminals 30/3 and 87/5.
10. Verify the G10R Cooling Fan Motor-Right is activated at high speed. If the cooling fan does not activate Disconnect the harness connector at the G10R Cooling Fan Motor-Right. Test for less than 2 ohms in the circuit between KR20C Cooling Fan Low Speed Relay terminal 87/5 and the G10R Cooling Fan Motor-Right terminal 2. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 2 ohms in the circuit between KR20E Cooling Fan Speed Control Relay terminal 30/3 and the G10R Cooling Fan Motor-Right terminal 1. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the G10R Cooling Fan Motor-Right. If the cooling fan activates
11. Install the KR20E Cooling Fan Speed Control Relay.
12. Verify both fan motors activate at low speed. If both cooling fans do not activate at low speed Disconnect both cooling fan motor harness connectors and the KR20E Cooling Fan Speed Control Relay. Test for less than 2 ohms in circuit between KR20E Cooling Fan Speed Control Relay terminal 87A/4 and the G10L Cooling Fan Motor-Left terminal 2. 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 both cooling fans activate
13. Test or replace the cooling fan relay listed below as appropriate: KR20C Cooling Fan Low Speed Relay KR20D Cooling Fan High Speed Relay

1. Ignition OFF.
2. Disconnect a Cooling Fan Relay.
3. Test for 70-110 ohms between terminals 85/2 and 86/1. If less than 70 ohms or greater than 110 ohms Replace the Cooling Fan Relay. If between 70-110 ohms
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 OR 3 and 2 3 and 5 3 and 1 1 and 5 If less than infinite resistance Replace the Cooling Fan Relay. If infinite resistance
5. Test for less than 2 ohms between Fan 2 Speed Control Relay terminals 30 and 87A. If 2 ohms or greater Replace the KR20E Cooling Fan Speed Control Relay. If less than 2 ohms
6. Install a 20 A fused jumper wire between relay terminal 85 or 2 and 12 V.
7. Install a jumper wire between relay terminal 86 or 1 and ground.
8. Test for less than 2 ohms between terminals 30 and 87. If 2 ohms or greater Replace the Cooling Fan Relay. If less than 2 ohms
9. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Within an Electrical Center)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Engine Coolant Fan Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Overheating

Engine Overheating

Loss of Coolant

Loss of Coolant

Thermostat Diagnosis

Thermostat Diagnosis

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/captiva/i-2-2013-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

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

1. Ignition OFF, disconnect the coolant heater cord from the E19 Coolant Heater.
2. Test for 30-40 ohms between the terminals of the E19 Coolant Heater. If not within 30-40 ohms Replace the E19 Coolant Heater. If within 30-40 ohms
3. Test for infinite resistance between each terminal of the E19 Coolant Heater and ground. If less than infinite resistance Replace the E19 Coolant Heater. If infinite resistance
4. Test or replace the coolant heater cord.

Perform the Diagnostic Repair Verification after completing the diagnostic repair.

1. «Coolant Heater Replacement (V6)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Coolant Heater Replacement (L4)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)
2. «Coolant Heater Cord Replacement (L4)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Coolant Heater Cord Replacement (V6)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system)

Engine Fails To Reach Normal Operating Temperature

1. Verify that the cooling system is properly filled. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. If the complaint is a low temperature reading, check the temperature gauge for proper operation. Connect a scan tool to the vehicle and read the system temperature. Compare this reading to the temperature. Replace the gauge or switch if necessary.
3. Refer to «Heating Performance Diagnostic»(/chevrolet/captiva/i-2-2013-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__heating-performance-diagnostic) if the complaint is no heat from the HVAC system.
4. Verify proper thermostat operation. Refer to «Thermostat Diagnosis»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis) .

Pressure Cap Testing

Special Tools

1. EN-24460-A Cooling System Pressure Tester
2. GE-42401-A Radiator Cap/Surge Tank Test Adapter

For equivalent regional tools, Refer to Special Tools

1. Remove the pressure cap.
2. Wash the pressure cap sealing surface with water.
3. Use the EN-24460-A Cooling System Pressure Tester (1) with GE-42401-A Radiator Cap/Surge Tank Test Adapter (2) in order to test the pressure cap.
4. Test the pressure cap for the following conditions: Pressure release when the EN-24460-A Cooling System Pressure Tester exceeds the pressure rating of the pressure cap. Maintain the rated pressure for at least 10 seconds. Note the rate of pressure loss.
5. Replace the pressure cap under the following conditions: The pressure cap does not release pressure which exceeds the rated pressure of the cap. The pressure cap does not hold the rated pressure.

Cooling System Leak Testing

Special Tools

1. EN-24460-A Cooling System Pressure Tester
2. GE-42401-A Radiator Cap/Surge Tank Test Adapter

For equivalent regional tools, Refer to Special Tools

1. Remove the pressure cap.
2. Test the operation of the pressure cap. Refer to «Pressure Cap Testing»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__pressure-cap-testing) .
3. Wash the pressure cap mating surface with water.
4. Use the EN-24460-A Cooling System Pressure Tester with GE-42401-A Radiator Cap/Surge Tank Test Adapter in order to apply pressure to the cooling system. Do not exceed the pressure cap rating.
5. The cooling system should hold the rated pressure for at least 2 minutes. Observe the gauge for any pressure loss.
6. Repair any leaks as required.

Draining Procedure

1. Place the coolant container under the radiator drain cock located at the bottom of the right radiator end tank.
2. Open the drain cock and drain the coolant. A small amount of coolant will drain from the system.
3. Remove the surge tank cap from the surge tank and the coolant will drain from the system.
4. For LAF vehicles, if the engine block needs to be drained, a drain bolt is located near the bottom of the water pump assembly.
5. Inspect the coolant.
6. 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/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__coolant-system-flushing) .

Filling Procedure

1. Slowly add a mixture of 50/50 DEX-COOL antifreeze and clean water to the coolant surge tank. Fill the cooling system as indicated below: For LAF vehicles when the engine block is not drained, add 3.5 liters (3.7 qts) For LAF vehicles when the engine block is drained, add 6 liters (6.3 qts) For LF1 vehicles, add 5 liters (5.3 qts)
2. Start the engine and check for leaks.
3. Run the engine and cycle the vehicle from idle to 3, 000 RPM in 30 second intervals until the engine cooling fan comes ON, the engine cooling fan turns ON at approximately 102°C (216°F). Repeat this process twice before the engine is turned OFF.
4. Return the engine to idle and idle for 30 seconds, then turn the engine OFF.
5. Allow the vehicle to cool, before adding additional coolant.
6. Add additional coolant to the surge tank until the level is approximately 13 mm (0.5 in) above the surge tank seam.
7. Install the coolant surge tank cap.

Cooling System Draining and Filling (GE 47716)

Special Tools

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

For equivalent regional tools, Refer to Special Tools

1. Place the coolant container under the radiator drain cock located at the bottom of the right radiator end tank.
2. Open the drain cock and drain the coolant. A small amount of coolant will drain from the system.
3. Remove the surge tank cap from the surge tank and the coolant will drain from the system.
4. For LAF vehicles, if the engine block needs to be drained, a drain bolt is located near the bottom of the water pump assembly.
5. Inspect the coolant.
6. 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/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__coolant-system-flushing) .

Vac-N-Fill Procedure

1. Install GE 42401-2 into the surge tank fill neck.
2. Install GE 42401-3 to the surge tank fill neck.
3. Attach the Vac N Fill cap to the GE 42401-3.
4. Attach the vacuum gauge assembly to the Vac N Fill cap.
5. Attach the fill hose to the barb fitting on the vacuum gauge assembly. Ensure that the valve is closed.
6. Pour the coolant mixture into the graduated reservoir.
7. Place the fill hose in the graduated reservoir.
8. Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
9. Attach the venturi assembly to the vacuum tank.
10. Attach a shop air hose to the venturi assembly. Ensure the valve on the venturi assembly is closed.
11. Attach the vacuum hose to the vacuum gauge assembly and the vacuum tank.
12. Open the valve on the venturi assembly. The vacuum gauge will begin to rise and a hissing noise will be present.
13. Continue to draw vacuum until the needle stops rising. This should be 610-660 mm Hg (24-26 in Hg). Cooling hoses may start to collapse. This is normal due to vacuum draw.
14. To aid in the fill process, position the graduated reservoir above the surge tank.
15. Slowly open the valve on the vacuum gauge assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose.
16. Close the valve on the venturi assembly.
17. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum and monitor for vacuum loss. If vacuum loss is observed, refer to «Loss of Coolant»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
18. Open the valve on the vacuum gauge assembly. The vacuum gauge will drop as coolant is drawn into the system.
19. Once the vacuum gauge reaches zero, close the valve on the vacuum gauge assembly and repeat steps 12-18.
20. Detach the Vac N Fill cap from the GE 42401-3.
21. Remove GE 42401-2 from the surge tank fill neck.
22. Add coolant to the system as necessary.
23. Inspect the concentration of the coolant mixture using GE-26568 Coolant and Battery Fluid 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.

Coolant System Flushing

Note. This procedure is intended for the engine cooling system only. Never use this procedure to flush the hybrid cooling system.

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

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

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the surge tank. Refer to «Radiator Surge Tank Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Clean and flush the surge tank with clean, drinkable water.
4. Install the surge tank. Refer to «Radiator Surge Tank Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Follow the drain and fill procedure using only clean, drinkable water. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
6. Run the engine for 20 minutes.
7. Stop the engine.
8. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge)
9. Repeat the procedure if necessary, until the fluid is nearly colorless.
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Scheme 3

Radiator Surge Tank Replacement

Scheme 4

Radiator Surge Tank Inlet Hose/Pipe Replacement (LEA)

Scheme 5

Radiator Surge Tank Inlet Hose/Pipe Replacement (LFW)

Scheme 6

Radiator Surge Tank Outlet Hose/Pipe Replacement (LFW)

Scheme 7

Front End Guard Replacement

Radiator Inlet Hose Replacement (LEA)

Special Tools

BO-38185 Hose Clamp Pliers

For equivalent regional tools, Refer to Special Tools

Removal Procedure

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-24l-lea-repair-instructions-on-vehicle) .
3. Disengage tension on the radiator inlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
4. Remove the radiator inlet hose (2) from the radiator.
5. Disengage tension on the radiator inlet hose clamp (1) at the engine using BO-38185 Hose Clamp Pliers.
6. Remove the radiator inlet hose (2) from the engine.
7. Remove the radiator inlet hose from the vehicle.

Installation Procedure

1. Install radiator inlet hose to the vehicle.
2. Install the radiator inlet hose (2) to the engine.
3. Engage tension on the radiator inlet hose clamp (1) at the engine using BO-38185 Hose Clamp Pliers.
4. Install the radiator inlet hose (2) to the radiator.
5. Engage tension on the radiator inlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
6. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-24l-lea-repair-instructions-on-vehicle) .
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Radiator Inlet Hose Replacement (LFW)

Special Tools

BO-38185 Hose Clamp Pliers

For equivalent regional tools, Refer to Special Tools

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-30l-lfw-repair-instructions-on-vehicle) .
3. Disengage tension on the radiator inlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
4. Remove the radiator inlet hose (2) from the radiator.
5. Disengage tension on the radiator inlet hose clamp (1) at the engine using BO-38185 Hose Clamp Pliers.
6. Remove the radiator inlet hose (2) from the engine.
7. Remove the radiator inlet hose from the vehicle.

1. Install radiator inlet hose to the vehicle.
2. Install the radiator inlet hose (2) to the engine.
3. Engage tension on the radiator inlet hose clamp (1) at the engine using BO-38185 Hose Clamp Pliers.
4. Install the radiator inlet hose (2) to the radiator.
5. Engage tension on the radiator inlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
6. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-30l-lfw-repair-instructions-on-vehicle) .
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Radiator Outlet Hose Replacement (LEA)

Special Tools

BO-38185 Hose Clamp Pliers

For equivalent regional tools, refer to Special Tools .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#general-information) .
3. Disengage tension on the radiator outlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
4. Remove the radiator outlet hose (2) from the radiator.
5. Remove radiator outlet hose bracket retainer (1).
6. Disengage tension on the radiator outlet hose clamp (2) at the thermostat housing using BO-38185 Hose Clamp Pliers.
7. Remove the radiator outlet hose from the thermostat housing.
8. Disengage tension on the radiator outlet hose clamp (3) at the engine oil cooler using BO-38185 Hose Clamp Pliers.
9. Remove the radiator outlet hose from the engine oil cooler.
10. Remove the radiator outlet hose from the vehicle.

1. Install radiator outlet hose to the vehicle.
2. Install the radiator outlet hose to the engine oil cooler.
3. Engage tension on the radiator outlet hose clamp (3) at the engine oil cooler using BO-38185 Hose Clamp Pliers.
4. Install the radiator outlet hose to the thermostat housing.
5. Engage tension on the radiator outlet hose clamp (2) at the thermostat housing using BO-38185 Hose Clamp Pliers.
6. Install radiator outlet hose bracket retainer (1).
7. Install the radiator outlet hose (2) to the radiator.
8. Engage tension on the radiator outlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
9. Lower the vehicle.
10. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Radiator Outlet Hose Replacement (LFW)

Special Tools

BO-38185 Hose Clamp Pliers

For equivalent regional tools, Refer to Special Tools

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#general-information) .
3. Disengage tension on the radiator outlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
4. Remove the radiator outlet hose (2) from the radiator.
5. Disengage tension on the radiator outlet hose clamp (1) at the engine using BO-38185 Hose Clamp Pliers.
6. Remove the radiator outlet hose (2) from the engine.
7. Remove the radiator outlet hose from the vehicle.

1. Install radiator outlet hose to the vehicle.
2. Install the radiator outlet hose (2) to the engine.
3. Engage tension on the radiator outlet hose clamp (1) at the engine using BO-38185 Hose Clamp Pliers.
4. Install the radiator outlet hose (2) to the radiator.
5. Engage tension on the radiator outlet hose clamp (1) at the radiator using BO-38185 Hose Clamp Pliers.
6. Lower the vehicle.
7. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Scheme 8

Engine Coolant Fan Replacement

Scheme 9

Engine Coolant Fan Motor Replacement

Scheme 10

Cooling Fan and Shroud Replacement

Scheme 11

Engine Coolant Fan Resistor Replacement (LEA)

Scheme 12

Engine Coolant Thermostat Housing Replacement (LEA)

Scheme 13

Engine Coolant Thermostat Housing Replacement (LFW)

Scheme 14

Engine Coolant Thermostat Replacement (LEA)

Scheme 15

Engine Coolant Thermostat Replacement (LFW)

Scheme 16

Engine Coolant Air Bleed Pipe Replacement (LFW)

Scheme 17

Water Outlet Replacement (LFW)

Water Pump Replacement (LEA)

Special Tools

EN-43651 Water Pump Holding Tool

For equivalent regional tools, refer to Special Tools .

1. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/testing-diagnostics/#engine-controls-and-fuel-24l-lea-repair-instructions) .
2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-24l-lea-repair-instructions-on-vehicle) .
3. If equipped, remove the coolant heater.
4. Remove the catalytic converter. Refer to «Catalytic Converter Replacement (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/exhaust/#engine-exhaust-system) .
5. Remove the engine coolant thermostat housing. Refer to «Engine Coolant Thermostat Housing Replacement (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the water pump cover (2), fasteners (3) and gasket (1) from the engine front cover.
7. Drain the coolant from the water pump using the plug at the bottom of the pump. Install the plug when finished.
8. Align the EN-43651 water pump holding tool (1) with the threads on the water pump sprocket. Tighten the water pump holding tool fasteners (2).
9. Secure the water pump holding tool with the previously removed water pump cover fasteners (1) into the engine front cover.
10. Remove the water pump sprocket to water pump fasteners (1).
11. Remove the front water pump fasteners (1).
12. Remove the rear water pump fasteners (1).
13. Remove the water pump (1).
14. If replacing the water pump cover remove the water pump rear cover fasteners (4).
15. Separate the water pump cover (1) from the water pump (3).
16. Remove and discard the water pump O-ring seal (2).

1. If replacing the water pump cover (1), install a new O-ring (2) to the water pump (3) and tighten the fasteners (4) to 25 N.m (18 lb ft).
2. Using a guide pin (2), align the pin with the water pump holding tool.
3. Position the water pump (1) against the engine block and hand tighten the water pump fasteners (3).
4. Install 2 water pump sprocket to water pump fasteners (1). After the fasteners are snug, remove the guide pin (2) and install the third fastener (3) and tighten to 10 N.m (89 lb in).
5. Install the water pump fasteners (1) at the front of the engine. Hand tighten at this time.
6. Tighten the water pump fasteners at the front and rear of the water pump to 25 N.m (18 lb ft).
7. Remove the water pump cover fasteners (1) from the engine front cover and water pump holding tool.
8. Remove the EN-43651 water pump holding tool (1) from the water pump sprocket.
9. Install the water pump access plate (2) gasket (1) and fasteners (3) and tighten to 10 N.m (89 lb in).
10. If equipped, install the coolant heater.
11. Install the engine coolant thermostat housing. Refer to «Engine Coolant Thermostat Housing Replacement (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (LFW)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
12. Install the catalytic converter. Refer to «Catalytic Converter Replacement (LEA)»(/chevrolet/captiva/i-2-2013-2016/remont/exhaust/#engine-exhaust-system) .
13. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-24l-lea-repair-instructions-on-vehicle) .
14. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/testing-diagnostics/#engine-controls-and-fuel-24l-lea-repair-instructions) .
15. Refill the coolant system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Water Pump Replacement (LFW)

Special Tools

EN 46104 Water Pump Pulley Holder

For equivalent regional tools, refer to Special Tools .

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Remove the generator drive belt. Refer to «Drive Belt Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-30l-lfw-repair-instructions-on-vehicle) .
3. Use the EN 46104 water pump pulley holder (1) to retain the pulley.
4. Remove the water pump pulley bolts and DISCARD the bolts.
5. Remove the water pump pulley.
6. Remove the water pump bolts and DISCARD the bolts.
7. Remove the water pump.
8. Remove and DISCARD the water pump seal.
9. Carefully clean the water pump sealing surfaces.

1. Install a NEW water pump seal.
2. Install the water pump.
3. Install the NEW water pump bolts and hand tighten the water pump bolts.
4. Tighten the water pump bolts in sequence. On the initial pass, tighten the bolts in sequence to 10 (89 lb in). On the second pass, tighten the bolts in sequence to 10 (89 lb in). On the final pass, tighten the bolts in sequence shown an additional 45 degrees.
5. Install the water pump pulley and the NEW water pump pulley bolts.
6. Use the EN 46104 water pump pulley holder (1) to hold the pulley.
7. Install the water pump pulley bolts and tighten to 12 (108 lb in).
8. Install the generator drive belt. Refer to «Drive Belt Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/mechanical/#engine-mechanical-30l-lfw-repair-instructions-on-vehicle) .
9. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/chevrolet/captiva/i-2-2013-2016/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

Scheme 18

Radiator Drain Cock Replacement

Scheme 19

Radiator Replacement

1. Turn the ignition OFF.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/captiva/i-2-2013-2016/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the rear transmission mount. Refer to «Transmission Rear Mount Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/automatic-trans/#automatic-transmission-6t45-mh7-or-6t50-mhj-mhk-repair-instructions-on-vehicle) .
4. Disconnect the coolant heater cord from the coolant heater.
5. Remove the coolant heater.

1. Install the coolant heater.
2. Connect the coolant heater cord to the coolant heater.
3. Install the rear transmission Mount. Refer to «Transmission Rear Mount Replacement»(/chevrolet/captiva/i-2-2013-2016/remont/automatic-trans/#automatic-transmission-6t45-mh7-or-6t50-mhj-mhk-repair-instructions-on-vehicle) .
4. Lower the vehicle.

Scheme 20

Coolant Heater Replacement (L4)

1. Disconnect the coolant heater power supply cord from the coolant heater (2).
2. Disconnect the coolant heater cord clip (1) from the engine.
3. Disconnect the coolant heater cord from between the washer bottle and the coolant reservoir (1).
4. Remove the coolant heater cord from the vehicle.

1. Connect the coolant heater cord to the coolant heater (2).
2. Secure the coolant heater cord clip (1) to the engine.
3. Route the coolant heater cord along the battery (2).
4. Secure the coiled power cord between the washer fluid bottle and the coolant reservoir (1).

1. Disconnect the engine coolant heater cord (1).
2. Remove the clips from the engine mount and surge tank.

1. Install the clips from the engine mount and surge tank.
2. Connect the engine coolant heater cord (1).

Cooling Fan Description and Operation (LEA)

System Overview

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

Low Speed Operation

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

High Speed Operation

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

Cooling Fan Description and Operation (LFW)

System Overview

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

Low Speed Operation

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

High Speed Operation

The ECM applies a ground to the coil side of the cooling fan low speed relay, the S/P cooling fan speed control relay and the cooling fan high speed relay. When energized, the high speed fan relay applies voltage directly to the left cooling fan through the switch side of the relay. Simultaneously, the low speed fan relay and the S/P speed control relay provide ignition voltage and a direct path to ground for the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans operating at high speed.

Engine Coolant Indicator(s)

LOW COOLANT LEVEL

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

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

Coolant Heater

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

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

Cooling Cycle

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

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

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

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

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

Coolant

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

Radiator

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

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

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

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

Pressure Cap

The pressure cap seals the cooling system. It contains a blow off or pressure valve and a vacuum or atmospheric valve. The pressure valve is held against its seat by a spring that protects the radiator by relieving pressure that exceeds 15 psi. The vacuum valve is held against its seat by a spring, which permits opening of the valve to relieve vacuum created in the cooling system as it cools off. The vacuum, if not relieved, might cause the radiator and/or coolant hoses to collapse.

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

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

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

Surge Tank

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

Air Baffles and Seals

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

Water Pump

The water pump is a centrifugal vane impeller type pump. The pump consists of a housing with coolant inlet and outlet passages and an impeller. The impeller is a flat plate mounted on the pump shaft with a series of flat or curved blades or vanes. When the impeller rotates, the coolant between the vanes is thrown outward by centrifugal force.

The impeller shaft is supported by one or more sealed bearings. The sealed bearings never need to be lubricated. Grease cannot leak out, dirt and water cannot get in as long as the seal is not damaged or worn.

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

Thermostat

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

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

Transmission Oil Cooler

The transmission oil cooler is a heat exchanger. It is located inside one of the radiator end tanks. The transmission fluid temperature is regulated by the temperature of the engine coolant in the radiator.

The transmission oil pump, pumps the fluid through the transmission oil cooler line to the transmission oil cooler. The fluid then flows through the cooler where the engine coolant absorbs heat from the fluid. The fluid is then pumped through the transmission oil cooler return line, to the transmission.

Special Tools

Illustration Tool Number / Description BO-38185 J-38185 South America Use Local Equivalent. Hose Clamp Pliers EN-24460-A J-24460-A Cooling System Pressure TestER EN-43651 J-43651 Water Pump Holding Tool GE-24731 J-24731 Tempil Stick GE-25025-5 J-25025-5 Dial Indicator Mountaing Post M6 X 100 GE-26568 J-26568 Coolant and Battery Fluid Tester GE-42220 J-42220 Universal 12V Leak Detection Lamp GE-42401-a J-42401 Radiator Cap and Surge Tank Test Adapter GE-47716 Vac N Fill Coolant Refill Tool 7000081 Tech 2 Diagnostic Scan Tool

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Electrical Center Identification Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Relay Replacement (Within an Electrical Center)
• Relay Replacement (Attached to Wire Harness)
• Engine Controls Schematics
• Instrument Cluster Description and Operation
• K20 Engine Control Module: Scan Tool Information (LEA or LFW)
• Diagnostic Trouble Code (DTC) List - Vehicle
• Water Pump Removal
• Moving Parts and Hot Surfaces Warning
• Approximate Fluid Capacities
• Heater Core Replacement
• Engine Coolant/Water in Transmission
• Engine Will Not Crank - Crankshaft Will Not Rotate
• Engine Will Not Crank - Crankshaft Will Not Rotate
• Coolant in Combustion Chamber
• Coolant in Combustion Chamber
• Lower Engine Noise, Regardless of Engine Speed
• Lower Engine Noise, Regardless of Engine Speed
• Cylinder Leakage Test
• Cylinder Leakage Test
• Heating Performance Diagnostic
• Fastener Caution
• Intake Manifold Cover Replacement
• Front Opening Upper Cover Replacement
• Headlamp Replacement
• Intake Manifold Cover Replacement
• Lifting and Jacking the Vehicle
• Fuel Pipe Shield Replacement
• Air Cleaner Assembly Replacement
• Catalytic Converter Replacement (LEA)
• Transmission Rear Mount Replacement
• DTC P0480, P0481, P0691, P0692, P0693 or P0694 (LEA)
• Cooling Fan Description and Operation (LEA)
• Cooling Fan Description and Operation (LFW)
• Engine Overheating
• Loss of Coolant
• Thermostat Diagnosis
• Engine Fails To Reach Normal Operating Temperature
• Cooling System Draining and Filling (GE 47716)
• Cooling System Leak Testing
• Pressure Cap Testing
• Adhesives, Fluids, Lubricants and Sealers
• Special Tools
• Coolant System Flushing
• Radiator Inlet Hose Replacement (LEA)
• Radiator Inlet Hose Replacement (LFW)
• Radiator Outlet Hose Replacement (LEA)
• Radiator Outlet Hose Replacement (LFW)