Engine Cooling System: Diagnosis Cadillac SRX II facelift

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of each diagnostic category.

Diagnostic Fault Information

KR20P Cooling Fan Medium Speed Relay

KR20C Cooling Fan Low Speed Relay

KR20D Cooling Fan High Speed Relay

KR20E Cooling Fan Speed Control Relay

KR20F Cooling Fan Relay

Typical Scan Tool Data

Cooling Fan Relay 1 and Cooling Fan Relays 2 and 3 Control Circuit Open, Low, and High Voltage Test Status

Cooling Fan Relays 1, 2 and 3 Control Circuit Open, Low, and High Voltage Test Status

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. DTC P0480, P0691, and P0692 run continuously when the conditions above are met.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTCs P0480, P0691, and P0692 are a Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0480, P0691, and P0692 are a Type B DTCs.

Diagnostic Aids

1. A condition with the powertrain relay or the bussed ignition voltage circuit to the cooling fan relay may set this DTC.
2. The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the scan tool Cooling Fan Relay Command parameters to know which fans are being commanded ON by the ECM.
3. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
4. 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.

Circuit/System Testing

1. Ignition OFF, disconnect and remove the underhood Fuse Block and housing.
2. Connect the engine harness connectors X2 and X3 to the Fuse Block.
3. Connect a DMM, set on the diode setting, between KR20F Cooling Fan Relay control circuit terminal X1-28 and ground.
4. Ignition ON, 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.
5. 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 relay coil control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V. Ignition OFF. Test for less than 2 ohms in the appropriate KR20 Cooling Fan Relay control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 1 V
6. Test or replace the X50A Fuse Block - Underhood.

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of each diagnostic category.

KR20P COOL FAN 2 Relay

KR20C COOL FAN 3 Relay

KR20D COOL FAN 1 Relay

KR20E COOL FAN 5 Relay

KR20F COOL FAN 4 Relay

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 P0481, P0693, and P0694 run continuously when the conditions above are met.

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

DTCs P0481, P0693, and P0694 are Type B DTCs.

DTCs P0481, P0693, and P0694 are Type B DTCs.

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

1. Ignition OFF, disconnect the KR20 cooling fan relays listed below: KR20P Cooling Fan Medium Speed Relay KR20D Cooling Fan High Speed Relay
2. Ignition ON, verify that a test lamp illuminates between ground and the KR20P relay coil ignition circuit terminal 86. 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. Test for less than 2 ohms in the ignition circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the KR75 Engine Controls Ignition Relay. If the test lamp illuminates
3. Connect a DMM, set on the diode setting, between a control circuit terminal listed below and ground: KR20P Cooling Fan Medium Speed Relay terminal 85 KR20D Cooling Fan High Speed Relay terminal 86
4. 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.
5. Verify the DMM reading is less than 1 V when commanding the Cooling Fan Relays ON with a scan tool. If 1 V or greater Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the appropriate KR20 Cooling Fan Relay control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V. Ignition OFF. Test for less than 2 ohms in the appropriate KR20 Cooling Fan Relay control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 1 V
6. Test or replace the appropriate KR20 Cooling Fan Relay.

Component Testing

1. Ignition OFF, disconnect the KR20 cooling fan relay.
2. Test for 60-100 ohms between terminals 85 and 86. If not within the specified range, replace the KR20 cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
4. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than the specified range, replace the KR20 cooling fan relay.

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of each diagnostic category.

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.

Important Preliminary Inspections Before Starting

Before using the Symptom diagnosis, perform the following

1. Perform «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) and verify all of the following items: Engine control module (ECM) and malfunction indicator lamp (MIL) are operating correctly. There are no diagnostic trouble codes (DTCs) stored. Scan tool data is within a normal operating range.
2. Verify the customer concern.
3. Perform the Visual/Physical Inspection in this section. The visual/physical inspection is extremely important, and can lead to correcting a condition without additional testing. It may also help reveal the cause of an intermittent condition.
4. Locate the correct symptom. Perform the tests and inspections associated with the symptom.

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

Visual/Physical Inspection

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

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

Symptom List

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

1. «Cooling Fan Always On»(ref-644718-S15248805292014072300000)
2. «Cooling Fan Inoperative»(ref-644718-S25246894922014072300000)
3. «Engine Overheating»(ref-644718-S28636615542014072300000)
4. «Loss of Coolant»(ref-644718-S11361741432014072300000)
5. «Thermostat Diagnosis»(ref-644718-S28458272462014072300000)
6. «Engine Fails To Reach Normal Operating Temperature»(ref-644718-S34288132632014072300000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of each diagnostic category.

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

1. Ignition OFF, remove the radiator surge tank fill cap.
2. Verify the coolant level float ring is secured, and is free to move up and down on the coolant level switch housing. Float ring not OK Clean or replace the radiator surge tank. Float ring OK
3. Ignition OFF, disconnect the harness connector at the B33 Coolant Level Switch.
4. Test for less than 5 ohms between the ground circuit terminal 1 and ground. If 5 ohms or greater Ignition OFF, and all vehicle systems OFF, it may take up to 2 minutes for all vehicles systems to power down. 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 less than 5 ohms
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
6. Ignition ON, verify the scan tool Coolant Level Switch parameter displays Closed. Displays Open Ignition OFF, disconnect the P16 Instrument Panel Cluster connector. Test the for less than 2 ohms in the coolant level signal circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Ignition ON, test for less that 1 V between the B33 Coolant Level Switch signal circuit terminal 2 and ground. If 1 V or greater, repair the short to voltage on the signal circuit. Displays Closed
7. Replace the B33 Coolant Level Switch.

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of the diagnostic category.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. Certain resistance conditions with IAT or ECT sensors may cause unwarranted cooling fan activation. If the ECM is commanding the cooling fans ON for no apparent reason and without any component or system DTCs set, the IAT or ECT sensor may be skewed. If this condition is suspected, refer to the Temperature Versus Resistance tables in the appropriate engine controls subsection.
3. If the cooling fan operates at high speed when the ECM is requesting medium speed operation, test or replace the KR20E Cooling Fan Speed Control Relay.

1. Ignition OFF, disconnect each KR20 cooling fan relay one at a time, in the order listed below, ignition ON: KR20C Cooling Fan Low Speed Relay KR20P Cooling Fan Medium Speed Relay KR20D Cooling Fan High Speed Relay
2. Verify that the cooling fan is not activated after each relay is removed. If the cooling fan is ON with all of the listed relays removed Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON. Test for less than 1 V between ground and the relay controlled output circuit terminal listed below: KR20C Cooling Fan Low Speed Relay terminal 30 KR20P Cooling Fan Medium Speed Relay terminal 30 KR20D Cooling Fan High Speed Relay terminal 30 If 1 V or greater, repair the short to voltage in the appropriate circuit. If the cooling fan is OFF after a listed relay is removed
3. Replace the appropriate KR20 Cooling Fan Relay.

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

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of each diagnostic category.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates the fan at a low speed Cooling Fan Relay 2 and 3 operates the fan at a medium speed Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed
2. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.
3. If the cooling fan operates at high speed when the ECM is requesting medium speed operation, test or replace the KR20E Cooling Fan Speed Control Relay and Fuse Block.

Inoperative in All Speeds

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

Low, Medium or High Speed Inoperative

1. Ignition OFF, disconnect the following relays: KR20C Cooling Fan Low Speed Relay KR20D Cooling Fan High Speed Relay KR20P Cooling Fan Medium Speed Relay
2. Verify a test lamp illuminates between ground and each of the cooling fan relay B+ circuit terminals listed below: KR20C Cooling Fan Low Speed Relay terminal 87 KR20D Cooling Fan High Speed Relay terminal 87 KR20P Cooling Fan Medium Speed Relay terminal 87 If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the appropriate relay B+ circuit, end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor. Test for infinite resistance between the appropriate relay controlled output circuit terminal listed below and ground: KR20C Cooling Fan Low Speed Relay terminal 30 KR20D Cooling Fan High Speed Relay terminal 30 KR20P Cooling Fan Medium Speed Relay terminal 30 If less than infinite resistance, repair the short to ground in the circuit. If infinite resistance, test or replace the G10 Cooling Fan Motor, replace the fuse as necessary. If the test lamp illuminates
3. Ignition ON, command the cooling fan ON at low speed.
4. Connect a test lamp between B+ and the KR20C Cooling Fan Low Speed Relay control circuit terminal 86. The test lamp should illuminate. If the test lamp does not illuminate Disconnect the X50A Fuse Block - Underhood harness connector. Test for less than 2 ohms between Fuse Block harness connector terminal X1-48 and ground. If greater than 2 ohms, repair the open/high resistance in the circuit. If less than 2 ohms, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
5. Ignition ON, command the cooling fan ON at high speed.
6. Connect a test lamp between ground and the KR20D Cooling Fan High Speed Relay coil ignition voltage terminal 85. The test lamp should illuminate. If the test lamp does not illuminate Replace the X50A Cooling Fan Speed Control Relay If the test lamp illuminates
7. Ignition OFF, install the previously removed cooling fan relays.
8. Ignition ON, connect a test lamp between ground and the cooling fan circuit terminals listed below. Command the cooling fan ON at High speed. The test lamp should illuminate at each terminal. R10A Cooling Fan Resistor - Low Speed terminal 1 R10B Cooling Fan Resistor - Medium Speed terminal 1 G10 Cooling Fan Motor B+ supply circuit terminal 2 If the test lamp does not illuminate Test for less than 2 ohms between the appropriate cooling fan relay controlled output circuit end to end. If greater than 2 ohms, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the appropriate KR20 Cooling Fan Relay. If the test lamp illuminates
9. Ignition OFF, connect the harness connectors to the cooling fan resistors.
10. Ignition ON, connect a test lamp between ground and the G10 Cooling Fan Motor B+ supply circuit terminal 2. Command the cooling fan ON at Low and Medium speed. The test lamp should illuminate as commanded in each speed. If the test lamp does not illuminate Test for less than 2 ohms between the G10 Cooling Fan Motor B+ supply circuit terminal 2 and the appropriate R10 Cooling Fan Resister terminal 2 If greater than 2 ohms, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the appropriate R10 Cooling Fan Resistor. If the test lamp illuminates
11. If all of the circuits and components test normal, test or replace the G10 Cooling Fan Motor.

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 60-100 ohms between terminals 85 and 86. If not within the specified range, replace the cooling fan relay.
3. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified range, replace the relay.
4. Install a 20 A fused jumper wire between relay terminal 86 and B+. Install a jumper wire between relay terminal 85 and ground. Test for less than 2ohms between terminals 30 and 87. If greater than the specified range, replace the relay.

Cool Fan 5 Printed Circuit Board Relay

1. Ignition OFF, disconnect the following cooling fan relays: KR20D Cooling Fan High Speed Relay KR20C Cooling Fan Low Speed Relay
2. Test for 190-230 ohms between KR20C Cooling Fan Low Speed Relay terminals 85 and 86 in the Fuse Block. If not within the specified range, replace the Fuse Block.
3. Connect a 3 A fused jumper wire between ground and KR20C Cooling Fan Low Speed Relay terminal 86, at the Fuse Block.
4. Ignition ON, verify a test lamp illuminates between ground and KR20D Cooling Fan High Speed Relay terminal 85, at the Fuse Block. If the test lamp does not illuminate, replace the Fuse Block.

Thermostat Diagnosis

Thermostat Diagnosis

1. Perform the «Diagnostic System Check - Vehicle»(ref-644698-S03753758692014072300000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-644698-S14897089332014072300000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-644698-S14982480842014072300000) provides an overview of each diagnostic category.

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.

Thermostat Test Procedure Using Tempil Sticks

The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a pencil like device. It has a wax material containing certain chemicals which melt at a given temperature. Take a 87°C (188°F) tempil stick or a 97°C (206°F) tempil stick and rub it on the thermostat housing. Temperature sticks can be used to determine a thermostat's operating range.

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

Thermostat Test Procedure Using Glycol

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

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

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

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

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

Pressure Cap Testing

1. Remove the pressure cap.
2. Wash the pressure cap sealing surface with water.
3. Use the GE-24460-01 Cooling System Pressure Tester (1) with GE-42401-A Radiator Cap/Surge Tank Test Adapter Kit (2) in order to test the pressure cap.
4. Test the pressure cap for the following conditions: Pressure release when the GE-24460-01 Cooling System Pressure Tester exceeds the pressure rating of the pressure cap. Maintain the rated pressure for at least 10 seconds. Note the rate of pressure loss.
5. Replace the pressure cap under the following conditions: The pressure cap does not release pressure which exceeds the rated pressure of the cap. The pressure cap does not hold the rated pressure.

Cooling System Leak Testing

Special Tools

1. GE-24460-01 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»(ref-644718-S23021956572014072300000) .
3. Wash the pressure cap mating surface with water.
4. Use the GE-24460-01 Cooling System Pressure Tester with the GE-42401-3 Radiator Cap/Surge Tank Test Adapter and GE-42401-2 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.