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Normally under a bolt on cover where the top hose meets the cylinder head or built into a housing along the top hose.

Follow the upper rad hose from the rad to the engine and it is in a housing there. When you replace it make sure the spring goes toward the engine.

Depending on make and model, it could be under the housing where either the upper or lower radiator attaches to the engine. Example: Dodge 2.7L, 3.7L, and 4.7L it is under the lower.

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13y ago
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15y ago

it mounts into the bottom of the water pump housing. the lower radiator hose mounts to the neck, the thermostat is under that neck. it is not an easy fix. it calls for 2.5 hours labor to replace, that is if you have all the correct tools and a lift to put the car on.

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Q: Where is the thermostat on a 1999 Audi a4 1.8t?
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