Elect Fan Runs All the Time

[EZ Money]

I have an 84 that I bought recently. The electric fan runs the minute you turn the key. It never shuts off. I located the relay and suspect that might be the problem, but understand it could also be the switch.

1. Which is most likely the problem?

2. Where is the temp switch located?

Thanks

Ron

[Ken]

^^^ To The Top ^^^

[jim coulter]

Hopefully someone with more experience will chime in, but I'll try to attack it.The temp. switch(which if my memory serves me is on the passenger side between cylinders 6&8) sends a signal to the ECM(computer) which in turns energizes the relay. The wire for the fan "breaks and makes" through a contact on the relay. The relay energizes, the contact makes and the fan runs. I would disconnect the wire at the switch and see if the fan still runs(you know its not telling the computer to run it because its disconnected). If it still runs, I would look closely at the relay. Some people want the fans to run all the time(dont ask me why, if the cooling system is working properly its a waste of time and will shorten the life of the fan I would suspect). Make sure someone hasn't jumped the contact on the fan relay so the fan runs all the time. If you know your way around a volt meter you can always check to see if the relay is in fact getting voltage, if not the contact might be stuck or jumped out(jumper made across the terminals). you might also trace the fan wires and make sure they go to the relay and not some other source. Hope this helps

[84TXVette]

I agree with Jim... I just had to replace my Fan Temp Switch today because the fan would never come on. Now it works.. yea! But, If this switch has a short, then the fan would always run.

[JonM]

See my answer here

http://www.corvetteactioncenter.com/...298#post407298