Not sure what vehicle you're asking about but on most it will be in a metal housing usually held on with two bolts and to find that all you have to do is look for the radiator hose Thea does NOT go to the water pump and look sat the end of that hose that does NOT go to the radiator and you should fond the housing at the end. So... Look for the radiator and follow the big hose away from the radiator and you'll either find the water pump of the thermostat housing. Good luck. More detail as to the specific vehicle will help next time.
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