Mustang V6-4.0L VIN N (2006)
Radiator Cap: Testing and Inspection
Cap
WARNING: Never remove the pressure relief cap while the engine is operating or when the cooling system is hot. Failure to follow these
instructions can result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out
of the degas bottle when removing the pressure relief cap, wait until the engine is cooled, then wrap a thick cloth around the pressure relief
cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been
released, turn and remove the pressure relief cap (still with a cloth).
1. Remove the pressure relief cap from the degas bottle.
2. Follow the instructions from the pressure tester manufacturer.
3. NOTE: If the plunger of the pump is depressed too quickly, an erroneous pressure reading will result.
Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure reading
obtained.
4. If the pressure test gauge readings are not within specifications, install a new pressure relief cap. If the pressure test gauge readings are within
specifications, carry out the cooling system Pressure Test. See: Testing and Inspection/Symptom Related Diagnostic Procedures/Non-Trouble
Code Procedures
