Hey my temperature guage in my '91 Trans Am GTA is dead / not functioning. I also have a '87 Iroc-Z and I know that the temperature is registered by a small wire on the drivers side of the engine directly connecting ( the small wire ) into the block. I had the guage in the Iroc die a couple times only to find out that this small wire had fallen off the connection from the engine block. Now , can anyone tell me if the harness in a '91 GTA has a similair wire which goes into the block?? I can't find it on the drivers side of the engine block. I am wondering wether maybe a wire does not exist externally but that the temperature is registered electronically by the computer somehow. Hmmmm? Help / suggestions anyone??

 

The temperature sending unit for all V-8 thirdgens locating in the driver's side head, I believe between the #3 and #5 cylinders. There should be one wire going to this unit, and if it isn't, there should and thats why your guage isn't functioning. Give a good glance over that part of the engine bay and you'll probably see it hanging off to the side near the motor mount or in that area.

 

i havent driven my car a whole lot since i put a 160* thermostat in, but ive noticed the the temp never gets over the first mark, its a little bit under. no matter how much i drive, thats all the higher it goes. is it ok

 

KagA152 it sounds like your car is running at a good / normal temperature. Both my 3rd gen temperature guages hit the first mark ( sometimes a hairline above, sometimes a hairline below ). I don't ever think I've seen the guage ever hit the 1/2 mark.