i have a problem with the temp gauge on my 02 3.0 a6. while driving up north this weekend (about 200 miles) i noticed that the temp guage went all the way to cold. the heat worked fine the whole time. if i turned up the temp on the climate control, it got warmer and cooler if i turned it down. so that seemed fine. after awhile, the gauge started woking again and went back to the middle. same thing on the way home. is this a thermostat problem? is it the gauge? or is it something else? any help would be appreciated. thanks.

 

It could be the gauge, but it could also be the coolant temp sensor. I would have the fault codes checked.

 

i have the same problem. i have no idea what it is though. I read a threw a few weeks back where some guys were addressing the issue and seemed pretty knowledgable(sp?). I forget what they said though. I wanna do a search.

 

probably the sensor