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Chev 350 thermostats are under the housing where the upper radiator hose connects to the block. Remove the hose, remove the two bolts or nuts and lift the housing. When replacing the thermostat and housing make sure you thoroughly clean both surfaces and use a small amount of gasket sealer

Answerfollow the top radiator hose to the top front of the egine. That's where the thermostats at. Make sure you clean everything good before you replace therm. Make sure you put the therm. back in the right way.
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Q: Where is the thermostat located on a 1990 Chevy Silverado 1500?
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