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It is mounted inside the water pump assembly which is essentially buried in the front of the engine. When I recently replaced my timing belt I also changed my entire water pump including the thermostat, just in case. Be aware that this is an entire day job for a do-it-yourselfer. I would suggest also changing the timing belt as you will be pretty much ripping apart the entire front end of your car to get to the waterpump. Go to and check the forums. There is a forum called "Garage" that has a complete write-up of this procedure.

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βˆ™ 2005-05-11 15:13:29
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Q: Where is the thermostat located on a 1998 VW Passat?
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