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REPLACED THERMOSTAT IN 1.8 TURBO 2003 VW JETTA. NOW IT LEAKS. ITS NOT IN BACKWARDS AND SEAL IS PROPERLY INSTALLED.

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There are several things to look for, especially if there was no leak before you worked on it. If the seal is a rubber O-ring, it could have slipped out of the groove and gotten pinched. If the seal is a gasket, a gasket sealer made for water pumps and thermostat housings should be used. The bolts may not be tightened properly, or a bolt may have gotten cross threaded, which would prevent the housing from being tightened down sufficiently. Or there could be debris, or old gasket material between the thermostat housing and the engine.

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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