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Off the hose somewhere there should be a sincere that acts like a thermostat that should be what you're looking for.

The coolant sensor is located close to the firewall, under several bundles of tubing.

It is difficult to get to.

It is held in by a clip (similar to a C clip with an elongated piece so you can pry it out easier).

The proper sensor for a 1.8 turbo is green.

If you need to change it, I would suggest a dealer, since it shouldn't cost too much $$ relative to the pain in the ___ it is to get to.

Believe me, lotta cussing was going on. ;-)

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Q: Where is the coolant temperature sensor located on a 2003 VW Passat?
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