I've had a mild overheating problem for awhile, where my car only seems to get hot in bumper to bumper traffic (the fan not coming on).

My car is an 1986 Camaro IROC Z TPI which has the single fan. I have no fan switch.

I did replace the relay that's right next to the fan on the passenger side which made no difference. I replaced the raditor cap (doubt it made any difference but the old one was the ugly greenish color like an old penny). The water pump seems to be pumping normally, I know the thermostat is less than 4 years old.

A lot of youtube videos for other types of cars talk about replacing a coolant sensor. Where is that located on the TPI?

I had my ECM replaced in July 2016, not sure if it's bad or not. If I can't figure it out I will take it to a shop I know (the ECM is under warranty at his shop).

Any other suggestions to try? Could the fan its self be bad?

 

http://www.autozone.com/cooling-heat...eVehicle=false

The fan comes on about 235 and the factory gauges tend to read high so that might be your issue.

 

I'm hoping so. A buddy of mine has a Temp. gun, later in the week after a long drive when the gauge is up, I'll stop by his house to see we can see what it's actually reading.

Is the temp sensor that thing sticking out on the drivers side of the block?

Also my fan doesn't come on when I turn on the AC.

 

Same issue with my 89. I bought a simple thermostat switch and connected it to the fan relays to trigger them:

http://www.autozone.com/cooling-heat...267187_69565_0

Works like a charm and its adjustable.

I also did not trust my instrument gauge so I bought this:

http://www.oreillyauto.com/site/c/de...2021&ppt=C0331

Awesome. Car is much more stable now.