Challenger V8-5.7L (2010)
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Radiator Cap: Testing and Inspection
Radiator Cap to Filler Neck Seal
RADIATOR CAP-TO-FILLER NECK SEAL
The pressure cap upper gasket (seal) pressure relief can be tested by removing overflow hose from radiator filler neck nipple. Attach hose of pressure
tester tool 7700 (or equivalent) to nipple. It will be necessary to disconnect hose from its adapter for filler neck. Pump air into radiator. The pressure cap
upper gasket should relieve at 124 kPa (18 psi) and hold pressure at a minimum of 110 kPa (186psi).
WARNING: The warning words "DO NOT OPEN HOT" on radiator pressure cap, are a safety precaution. When hot, pressure builds up in
cooling system. To prevent scalding or injury, radiator cap should not be removed while system is hot and/or under pressure.
Do not remove radiator cap at any time except for the following purposes:
1. Check and adjust antifreeze freeze point.
2. Refill system with new antifreeze.
3. Conducting service procedures.
4. Checking for vacuum leaks.
WARNING: If vehicle has been run recently, wait at least 15 minutes before removing radiator cap. With a rag, squeeze radiator upper hose to
check if system is under pressure. Place a rag over cap and without pushing cap down, rotate it counter-clockwise to first stop.
Allow fluid to escape through the coolant reserve/overflow hose into reserve/overflow tank. Squeeze radiator upper hose to
determine when pressure has been released. When coolant and steam stop being pushed into tank and system pressure drops,
remove radiator cap completely.