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follow the upper hose from the radiator to the engine and where it clamps should be the thermostat housing assembly... also, you should be able to find a shop manual at the library, you'll have to make copies of the sections you want as they are reference only, but everyone should have a regualar manual for their vehicle, available at an auto parts store....may the force be with you :)

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17y ago
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Q: Where is the thermostat located on a 1990 Buick LeSabre Custom?
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