F 150 2WD Pickup V8-5.4L SOHC VIN 3 (1999)
Radiator Cap: Testing and Inspection
1. WARNING: Never remove the pressure relief cap under any conditions while the engine is operating. Failure to follow these instructions
could result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out of the
cooling system, never remove the pressure relief cap from a hot degas bottle. Wait until the engine has cooled, then wrap a thick cloth
around the pressure relief cap and turn it slowly one turn (counterclockwise). Step back while the pressure is released from the cooling
system. When certain all the pressure has been released, remove the pressure relief cap (still with a cloth).
Inspect the pressure relief cap and seals for damage or deterioration. Replace the pressure relief cap if necessary.
2. Fit the pressure relief cap to Radiator/Heater Core Pressure Tester Kit using the aftermarket adapter.
3. NOTE: If the plunger of the pressure tester is depressed too fast, an incorrect pressure reading will result.
Slowly pump the pressure tester until the pressure gauge stops increasing and note the highest pressure reading. Release pressure and repeat test.
Install a new pressure relief cap if the pressure is not 99.3-121.4 kPa (14.4-17.6 psi).
