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This is difficult to do. it is located on the top of the engine on the right side. If you remove the air breather box first it will give you some room to work but the back bolt on the thermostat is really difficult to get out due to lack of room to move the wrench. it takes several hours lots a patience.

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Q: How do you replace the thermostat on a 1999 Oldsmobile silhouette?
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