Radiator Cap to Filler Neck Seal - Pressure Relief Check

Cooling System Pressure Cap To Filler Neck:

The pressure cap upper gasket (seal) pressure relief can be checked by moving the overflow hose at the radiator filler neck nipple. Attach the radiator pressure tester to the filler neck nipple, and pump air into the system. The pressure cap upper gasket should relieve pressure at 69-124 kPa (10-18 psi), and hold pressure at 55 kPa (8 psi) minimum.

WARNING: The warning words do not open hot on the pressure cap is a safety precaution. When hot, the cooling system builds up pressure. Prevent scalding or other injury, the pressure cap should not be removed while the system is hot and/or under pressure.

There is no need to remove the pressure cap at any time except for the following purposes:
- Check and adjust coolant freeze point
- Refill system with new coolant
- Conducting service procedures
- Checking friar leaks

WARNING: If vehicle has been run recently, wait 15 minutes before removing cap. Place a shop towel over the cap, and without pushing down, rotate it counterclockwise to the first stop. Allow fluids to escape through the overflow tube. When the system stops pushing coolant and steam into the CRS tank and pressure drops, push down on the cap and remove it completely. Squeezing the radiator inlet hose with a shop towel (to check pressure) before and after turning to the first stop is recommended.