Component Tests and General Diagnostics

WARNING:
SCALDING HOT COOLANT, WATER OR STEAM
NEVER remove the radiator cap under any conditions while the engine is operating. Failure to follow these instructions could result in personal injury and/or damage to the cooling system or engine. To avoid having scalding hot coolant or steam blow out of the radiator, use extreme care when removing the radiator cap from a hot radiator. Wait until the engine has cooled, then wrap a thick cloth around the radiator cap and turn it slowly to the first stop. Step back while the pressure is released from the cooling system. When you are certain all the pressure has been released, press down on the radiator cap (with a cloth), turn, and remove.

Cooling Fan Operation Hazard
To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine with the hood open until the fan has first been examined for possible cracks and separation.

Unexpected Cooling Fan Operation
The electric cooling fan will operate whenever the key is ON and the coolant is hot (above 97°c [207 °F]), even though the engine may not be RUNNING. Avoid placing hands, clothing, tools, or other objects in the fan blades at any time. The fan blade will also operate if the engine coolant temperature (ECT) sensor is disconnected.

1. Remove the radiator cap.
2. Fill the radiator as needed.
3. Fit the pressure tester to radiator neck using an aftermarket adapter.

CAUTION: Do not pressurize the cooling system beyond 102 kPa (14.9 psi).

4. Pressureize the cooling system to a maximum of 102 kPa (14.9 psi) and hold for 2 minutes. If the pressure drops within this time, inspect for leaks and repair as required.
5. Inspect the radiator cap and seals for damage or deterioration. Replace the radiator cap (8100) if necessary.

6. Fit radiator cap to Radiator/Heater Core Pressure Tester Kit 014-R1069 using the aftermarket adapter.

NOTE: If the plunger of the pressure tester is depressed too fast, an incorrect pressure reading will result.

7. Slowly pump the pressure tester until the pressure gauge stops increasing and note the highest pressure reading.
8. Release pressure and repeat test. Replace if the pressure is not 99.3-121.4 kPa (14.4-17.6 psi).