Yummybud924

This happened yesterday I parked my car and came bak half an hour later an the fan was still blowing. It's also -15 outside and the engine is not overheating or anything.

I did a search and it looks like relay or temp sensor?

I looked at paragon and there are two relays listed one is $240... it says auxiliary fan relay, and the other just says general relay g10.

My car is a late 85.5 by the way. anyone know what the proper relay I need is? I want to order it soon.

odonnell

The more expensive relay is for late cars, unfortunately. Luckily, I doubt it's the relay...

Pull the air conditioner relay. If the fans stop, it's bad.

If they still run, disconnect a lead from the thermofan switch. If they immediately stop, your switch is stuck. It's a cheap part. My money is on the switch.

SirLapsalot

When that has happened to me before it was the switch that had failed not the relay.

Yummybud924

okay thanks. my car is back at university, I just went home for christmas so I'll have to wait until january when i'm back to test it. I just disconnected the batter before I left.

Yummybud924

okay thanks guys. I thought it'll likely be the switch. I read that when the relays fail it usually doesn't run at all, and the temp switches usually fail in the off position.


next question. which temp switch should I go for, there are three different ones (different operating temperatures).

where I go to school, it can get to -30 in the winter so it's colder when i'm driving it there.

odonnell

Get one that's closest to your thermostat temp. Where you're from, I would get the OEM spec (92 C IIRC) if you don't know what your thermostat temp rating is. Unless you're running hot on a regular basis, in which case go with a lower temp switch. Like 85 C or something

Toran

Had same issue.
Replaced the fan switch and problem went away.

SpeedyC2

Also check the spade wire connections on the resistors under the plastic shroud at the base of the windshield on the passenger side.

I had a problem with the fan running when I first got my S2, and cleaning these connections up, applying some dialetric paste, and making sure the connections were tight solved the problem. A very cheap and easy fix!

mytrplseven

Fan thermo switch on passenger side is likely culprit. It happened to me on one of my 944's as well. Most common item to fail in this situation.