Electric Fan?

[t-topflyer]

1987 had to move it today. Been a while since I've cranked it. Everything functioned normally the last time I drove it. It's 36 degrees outside today. I noticed the electric fan running which is unusual as it usually only comes on if the A/C is on, or the car is up to full temperature on a warm day. Neither of these were the case today. Any ideas?

 

[BRAD_PADGETT]

Disconnect the fan delay relay. Useless part of your car. It degrades with time and will run the fan even with the car off.

 

[pacecarta]

windshield defroster commands ac

 

[t-topflyer]

windshield defroster commands ac

That's the thing and I understand that, but nothing was on at all as far as climate control.

 

[t-topflyer]

Disconnect the fan delay relay. Useless part of your car. It degrades with time and will run the fan even with the car off.

Are replacements available? Will the fan work at all with that disconnected?

 

[pacecarta]

without delay relay the fan works fine

 

[reggie44]

T-TopFlyer, if it's your STOCK electric fan motor that turns out to be toast... let me know as I believe I have a few good used ones.

 

[t-topflyer]

T-TopFlyer, if it's your STOCK electric fan motor that turns out to be toast... let me know as I believe I have a few good used ones.

Thanks. The fan works fine. It's just on when it shouldn't be, all the time that it's running regardless of ambient and engine temperature or even when A/C isn't on. I've read that it might also be the cooling temperature sensor or fan control module.

 

[reggie44]

John Spina from Caspers in on the board from time to time... guaranteed he will know what your issue is... he is a electrical genius.
Hope this helps.

 

[t-topflyer]

Car does have a turbo tweak chip. IIRC it is programmed to come on at a lower temperature than stock, but I don't remember what temperature that is. I guess it's possible that I may have not noticed it coming on in the past and just found it odd that it was on at such a low ambient temperature,

 

[pacecarta]

tt chip is 167 on ,

 

[Red Sector 7]

Thanks. The fan works fine. It's just on when it shouldn't be, all the time that it's running regardless of ambient and engine temperature or even when A/C isn't on. I've read that it might also be the cooling temperature sensor or fan control module.

The culprit when this happens is the Fan Delay Relay, as Brad mentioned. It is the large relay on the driver's side. There are three fan relays located on the driver's side inner fender, the largest one is the Fan Delay Relay, it is the one closest to the windshield. Unhook that relay, tape off the harness connector and tie strap it out of the way. Remove the relay it is one bolt. Someone mentioned John Spina, he did a seminar at a Turbo Buick event several years ago, and talked about the common electrical issues with these cars. The very first one he tackles is this very issue concerning the Fan Delay Relay. Skip to 3:48 to get straight to that issue he talks about here: