BOTH PRIMARY AND AUXILLIARY RADIATOR FANS QUIT WORKING ON MY 1985 VET. ANY IDEAS ON CAUSE WOULD BE HELPFUL THANKS

 

Fan fuse or fusible link near battery. Follow the heavy red wire from main fan relay(inner fender below MC) back towards battery and you will find the fusible links.

 

Temp. Switch or Bad Relay. Is it controlled by the ECM or a contact Temp Switch in the Right Cyl. Head?

 

THINK I FOUND PROBLEM BAD RELAY THANKS

 

Found bad relay thanks

 

Good..That's usually what goes first.

 

Hello to everyone. I'm glad I came across this forum as I have an issue that needs to be addressed.

I've got a problem with overheating. both fans do not come on when supposed to EXCEPT when I turn on the AC, then one fan comes on. that has kept me from damaging the motor. This is what I ve done, replaced both relay's as they were old. I can ground each relay making each fan turn on by relay connector F.. i've got voltage at the relays using connector E to ground also voltage at connector D. I can jump terminal A to B and they turn on., i've grounded the fan's and got each one to work.

I've pulled out the ALCL from underneath and I think I've got a problem already. As you look at the ALCL attached to the frame housing , the circular hole is on the right side as you look at the pins, with the oval hole on the left. they should line up in pairs, FEDCBA being the top letters and the bottom are GHJKLM, reading left to right. I have 16 slots with 6 slots EMPTY, and most important the slot for letter B is empty with no wire, as is the location for letter F. I've traced the bundled wires as far up into the dash area as I can and yet there is still 6 wires missing. it appears that someone must of done some monkeying around up there.

My guess is, with the ignition key in the ON position and iv'e ground the inoperative cooling fan relay's (both of them) via connector terminal "F", they turn on, that my problem is with the ECM.

Feedback ? I'm just a home mechanic with available tools and I do not want to take it to a "shop". Thanks for your input.

jason

 

How does one bad relay kill both fans ?

 

Greenbasil, what year vette?

 

oops forgot. it's a 94 LT1 Coupe with targa top. 6 speed manual.

 

Sorry, not familiar with your year.
If you were pre 90, I could have helped.

 

NOT SURE BUT BOTH FUSEIBLE LINKS ARE GOOD AND BOTH SENSORS WORK, ACTUALLY FOUND 2 RELAYS GOING TO REPLACE THEM AFTER WAITING A WEEK FOR THEM TO BE SHIPPED FROM CALIF. EVERYTHING ON MY VETTE IS no longer being made and is no longer available thru G.M.

 

I'm new and I jumped in on this post, perhaps I should start a new one that's particular to my issues?

 

Yes, you will get much more help. Include your year in your thread title, that way members will know right away if they can help.

 

ok. i did make a new post but it disappeared on me. iv'e got to go looking for it. perhaps went in the wrong thread/forum.