Cap, Radiator: Inspection

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1 - VENT VALVE

2 - LOWER O-RING SEAL

3 - MAIN SPRING

4 - UPPER O-RING SEAL

The vent valve at bottom of cap should closed. A slight downward pull on the vent valve should open it. If the rubber gasket has swollen and prevents vent valve from opening, replace cap.

Hold cap at eye level, upside down. If any light can be seen between vent valve and rubber gasket, replace cap. A replacement cap must be the type designed for a coolant reserve/overflow system with a completely sealed diaphragm spring and a rubber gasket. This gasket is used to seal to radiator filler neck top surface.