My a/c fan is constanly on with the key on and I found the temp sensor on the back of the water pump broken. I was told that that sensor is what runs the fan correct? So that would be why its on?

 

Yes.

 

Sweet. Just making sure.

 

i dont think that is true. i thought it was the one on the top of the thermostat neck

 

You are correct. The A/C fan's sensor is on the top side of the thermostat housing, at least on S4 turbo engines.

 

Ah, there was something that looked like was supposed to be there but it looks the just the metal part of the sensor.

 

what do i win?

 

Damn that a/c fan, always draining my battery LOL

 

Unplugging the sensor on the thermostat cover, and properly taping it off will keep the fan from coming on. If you just let the wire rest on the block, it will ground the relay and turn the fan on.

 

I saw a wire grounded so that will be it then.

 

unless you have an s4 t2, you are mistaken.

 

Automatic FCs got the backup e-fan too.

 

s5's too?

 

S5 NA's have it, probably TII's as well. I believe it comes on at 225*F + coolant temp/ AC operation.

 

Mine runs all the time too, I've been having some strange battery drain problems as well. Actually, it Used to run. I guess since its not made for constant operation it wore out pretty quickly, and started making stange noises. guess I should replace that sensor...

 

i have a spare sensor if anyone needs one...