Question about 2004 Volkswagen Jetta

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Thermostat? My car is overheating, but only when i am driving. When the car sits idle the temperature is fine and the fans do kick on. I was told it was the thermostat and that it should be switched out. I have purchased the parts and a couple of my friends are going to fix it for me but are unsure where the thermostat is located. Help...

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  • angie7700 Jul 25, 2008

    I have the exact same problem with my Jetta, my boyfriend and I replaced the Thermostat and tested the old one (easy to do! just put it into a pan of water and boil it, the spring will move and the valve will open if it's okay)- the problem continued and the Thermostat was just fine. I took it to a mechanic and found out it is most likely the water pump. I'm scheduled to have it repaired next Friday- do you have the extended warranty? I do, and it will be covered.

  • Eve Mathews Aug 26, 2008

    Our 2004 Jetta was overheating after a short time of driving (first happened four days ago) and we have not been able to drive it for over 5 minutes since them without the temperature going too high. It is at the mechanic right now and he said it was not the thermostat. He did say one of the fans was out, but it did not fix the problem completely. They think it might be a blown head gasket - there was no smoke or anything when it first overheated though.

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The thermostat is located behind the alternator. Atleast on the 1.8t it is. I had the same problem and same symptoms. I hate to tell you this but its probably not the thermostat. Its the water pump. They have plastic impellers on them that that deteriorate after a while. Make sure if you get your water pump replaced you get one that has a metal impeller on it. You should get a new timing belt well they are in there as well. They have a pretty good deal on kits at ecstunning.com

Posted on Jul 22, 2008

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