2000 a6 2.7t heat issues
 

So the car runs cold all the time. If I sit in the driveway at idle it warms up to almost normal but the min. I touch the gas pedal the temp gauge starts dropping down to cold again and the slight heat I do have goes away. For the life of me I can't figure it out. Any ideas would be greatly helpful.

Well I've got it figured out sorta. When I turn my heater on my a/c fan turns on an cools the entire car. Leave hear off car warms up and stays warm. Now I figure that out.