84 c4 overheating help
Instructor
Joined: Apr 2009
Posts: 118
Likes: 1
From: baltimore md
Which part is this?
Ecklers does not show anything when I search for "sensor that tricks the computer" so wondering which part number this is? Having some issues with my 87. Thanks
Intermediate
Joined: Oct 2009
Posts: 43
Likes: 0
I have an 85 that I found was running hot in traffic, replaced the thermostat but also had to re-chip with one that turned on the fans at a lower temp. If you only replace with a lower thermostat will do nothing.
Instructor
Joined: Jul 2013
Posts: 196
Likes: 7
From: Newtown Square PA
Temps are normal. Fan comes on about the same as mine. Temps really rely on airflow. I've had mine checked, flushed etc. By a reliable vette owner mechanic, a chevy dealer that specializes in vettes and a vette specialist. Got the same answer from all. I really don't trust the guages. I think there about 10 degrees too high.
Burning Brakes
Joined: Oct 2006
Posts: 794
Likes: 2
From: Allentown Pa.
Gentlemen, on my 90 coupe the fans come on at 228 degrees and all the wise Vette guys tell me this is normal. Well, for nine years I drove my Vette with one eye on the temp gauge and was hoping the fans come on as they were programmed to do. I got tired of this crap and installed a computer chip adapter that turns on the fans at 200 and off at 185. I also put in a 160 thermostat so the water was circulating till the fans shut off. What a relief to drive my car without worrying about overheating in traffic in the summertime with the AC on. I bought it from TPI parts in Florida. Yeah, I know some guys will say that the cars were designed that way and it is normal but I feel much better this way and I am pleased to have the car run with the temps at 200 to 185. O.K that's my 2 cents worth.
Intermediate
Joined: May 2015
Posts: 32
Likes: 0
I'm having a ploblem with the fan not coming on and the over flow is boiling .changed the thermostate toa 195 tried a fan relay and know checking the temp regulater on the block has not started until about 1 week aog.
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Melting Slicks
Joined: Dec 2009
Posts: 2,235
Likes: 286
Is it an 84? If so unplug the fan switch & ground it. Its in the pass. side head between the rear spark plugs. With the key on & the switch wiring grounded, the fan should run. Does the relay click?
Use a test light to test for power & ground at the fan.
Use a test light to test for power & ground at the fan.
