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Go To a auto parts store that rents tools and ask for a coolant system pressure tester.=You put it on the cap with the engine cold and off. Pump it up to what your system is max at usually not much 13lb or so then you can listen for the hiss of air if it is the heater coil or a hose that is not visible check to see how the pressure is holding if no loss of pressure you might have a bad cap. Good luck but a cold pressure check is much safer.=

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16y ago

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