I've owned the car for 3 months (2000 1.8tQ), and I haven't seen the fan ever spin. It neither spins when temp is hot and I'm stuck in traffic, nor when the A/C is turned on.

My understanding is that the fact that it doesn't run with the A/C rules out the radiator temperature sending unit as the source of the problem.

I've checked the fuse box, but will check for the relay under the dash tonight. A/C works fine, and when I turn it on I can hear at least one relay go "click" .

If the fan relay is OK, what are the next steps to troubleshoot?

Thanks.

 

what kind of temperatures are you reading when it is hot and your AC is on?

 

When the car is moving it is dead center on the dial. Has gotten a bit higher if stuck in traffic on a hot day.

 

It should run when the A/C is on. If you have an electrical meter, you could check whether or not it's getting juice when the A/C is on. I'd hook it up with some alligator clips so you don't have to be reaching up in the engine compartment while it's running. How much past center does it get?

 

I think it's only suppose to come on if the engine gets above 210?

 

My understanding is that it comes on regardless of temp if the air conditioning is on.
What does your car do?

 

Yup, mine only comes on when the A/C is on. I am thinking as my next mod, I'm going to put in an electric primary fan and get rid of the factory viscous clutch fan. It's a horse power hog. The electric fan moves more air than the factory fan as well. Anyone upgraded the primary fan to electric?

 

theres a kit that some places sell the only disadvantage is that most electric fans are really loud

 

My aux fan does not kick on just because the AC is on. It comes on when my engine starts to get above the 210 mark.

 

I think there are two controls, one A/C controlled, and the other temperature controlled.

You sure yours is working correctly?

Anyone want to turn on their airconditioning on a 1.8 B5 , lift the hood and check if the fan comes on?