ruckus1027

Okay, so I just bought my first Audi. It's a 2001 A4 1.8t FWD. First off, I'd like to say I'm a noob around the Audi scene, but not a noob when it comes to forums. I know I'm suppose to search and I did, but was not satisfied with what I found. The answers were kind of all over the place and I'd like a definitive answer. So if you know the answer or a thread that can clearly help me please point the way.

Anyways, the fan upfront is on all the time. As soon as I turn the key to acc position (engine not even cranked), the fan kicks in. From the sound of things, it seems to be on high. Also, the temperature gauge in my car is not working. It is dead I think; pinned cold at all times.

I read about the engine coolant temperature sensor causing fan problems. Could this sensor cause both the temp gauge and fan acting erratically? I haven't gotten a vagcom yet because I seriously just got the car yesterday. Please point me out to the right direction.

Thanks guys
Louis

AudiMick

The temperature sensor (ECT) has nothing to do with the fan, it provides an input to the ECU and the gauge.

The electric fan is controlled by a thermoswitch in the radiator. When the AC is on the fan should run all the time.So the first thing to do is turn off the AC (ECO) if it still runs you probably have a bad switch.

The mechanical viscous fan will keep the engine cool enough in most climates, it's only when it's really hot should the electric fan cut in.

The temp gauge could be the cluster or the temp sensor. Best to get a Vag.com and find out which one.

mtroxel

+1 Those are different circuits.

If you don't have access to a VAG-COM, that coolant temp sensor is only about $20. And it will make the temp gauge go manic.

ruckus1027

Alright well I located a Vag-com owner in my area and I plan on meeting with him tomorrow. Hopefully, I can straighten everything out. Thanks a lot for the help guys.