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On a 4.9L follow the upper radiator back to the engine. This should be the thermostat housing. The thermostat should be inside. On a 4.6L the thermostate is in the housing which is near the water pump drivebelts "on the coolant crossover housing". If this is not clean I recommend you buy the Haynes for your DeVille. See page 3-4, illustration 3.14.

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Q: Where is the thermostat located on a 1999 Cadillac DeVille?
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