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White substance on thermostat

94stepside5794stepside57 Member Posts: 1
edited August 2017 in Chevrolet
There is a white milky substance on the thermostat but not on the oil cap. I am figuring that I have a bad intake gasket but not sure if this also means I have a bad head gasket.
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Answers

  • ray80ray80 Member Posts: 1,655
    'Thermostat' ? Or do you mean radiator cap?
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