About GM Thermostat Gasket
Another minute but critical engine component is the GM thermostat gasket, and it is fashioned to keep a tight seal between the thermostat and its thermostat housing so that no coolant is able to leak out. Most thermostat gaskets are comprised out of paper or rubber ingredients, and they are able to withstand high temperature exposure over many years of use. Coolant will not leak from the thermostat housing area when the gasket is doing its job appropriately. These gaskets are usually mounted above the level of the water pump where your upper radiator hose is clamped to the thermostat housing assembly.
To replace the gasket drain your coolant, remove the holding clamp for radiator hose and then remove radiator hose end from the thermostat housing. Next remove the thermostat housing mounting bolts, the housing itself and then the thermostat assembly. Scrape away any old leftover gasket so when you reinstall your new gasket you'll be sure that its installation surface is flush, so it can be leak-free. Anytime you replace your thermostat, it is an excellent rule of thumb to replace the thermostat gasket simultaneously.
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