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 http://www.clubb5.com and check the forums. There is a forum called "Garage" that has a complete write-up of this procedure.
This site has a photo lineup, picture by picture guide to a few maintenance items including waterpump/cambelt etc - http://www.taligentx.com/passat/ and its easy to follow.Just like a colour Haynes manual.
If you have a 1999 Passat V6, the coolant temperature sensor is located in the lower radiator hose.
how do you remove a 1999 vw passat radio
It is located on the front right side of the engine slightly underneath it
Under the passenger side floor carpet.
The Thermostat on the four cylinder engines is in the bottom passenger at the front of the engine behind the power steering in the water pump entrance.
what number fuse is for the brake lights on a 99 vw passat what number fuse is for the brake lights on a 99 vw passat
where is the starter located in a 2001 VW Passat. GLS 1.8 V6
The transmission control module on a VW Passat from 1999 is located under the passenger side floor carpet. The TCM gather input from sensors to implement an operating strategy.
The Horn on a Passat is operated by pressing the centre of the steering wheel.
Does it have.inerference eng
http://www.tobio.info/passat/howtos/passat_air_filter.html
The starter on a 2001 VW Passat is located on the right side of the engine's bottom. The shield has to be removed before you can reach the starter.