Signs of a Faulty Radiator Pressure Cap
Be the change that you wish to see in the world.The purpose of the jiggle valve is to eliminate any air that may be trapped within the cooling system and allow it to pass by the thermostat. If an air pocket is trapped on the engine side of a thermostat that does not have a jiggle valve, then the engine could overheat before the thermostat gets warm enough to open. The jiggle valve eliminates this by allowing that air pocket to pass by the thermostat thus allowing direct coolant contact with the thermostat. You must be sure to replace a thermostat that has a jiggle valve with one that also has the jiggle valve. Careful attention needs to be paid when installing a thermostat with a jiggle valve to correctly position it into the housing to ensure it will function correctly.
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