The otherday I noticed my coolant temp needle was going up and down pretty quick with the tap of the gas. It was showing the real temp then back to 0 then back to 180. A day later no problems, always showed the temp. Now The temp needle does the average sweep when you turn the key to start but then goes back and stays. I figured myy temp sensor went bad. The car runs fine still. Now, which one do I replace? The one under the drivers ex manifold? Or is it the one underneath the throttlebody?

All help appreciated
Travis

 

The sender for the guage is the one in the driver side head, the one in the intake is the coolant sensor for the ECM. You might need to trace the wire from the sender in the head back toward the firewall connector between the brake booster and fender. Make sure it isn't loose or intermittantly gounding on something.

 

When mine did this is was because the gauge itself was loose in the cluster. When I pulled the cover off I noticed that one of the three pins had come loose from it's clip and there was one retaining screw missing. I reseated the gauge and replaced the missing screw and everything was OK again.

 

Sounds like a short somewhere.

 

Just for precaution I will replace both units on tuesday and see how that goes, fingerscrossed............. I will look for any loose connections or shorts.

 

Well I replaced both sending units and everything is back to the way it was, thanx for the help

 

Hey TPIformula where did you find the coolent temp sensor that goes in the drivers side head? I cant find one at autozone or any parts store.

 

Well Ironically I am a Manager @ Autozone and thats where I picked both of mine up, Its a PN# TU66 for the Temp Switch, and a PN# SU109 for the coolant temp sensor.

We carry BOTH Sensors, sounds like you were dealing with a redshirt counter person that didnt want to look it up for you, Ask a Grey Shirt and they will be gladly to help you

 

Cool, thanks for the help ill see if i can get ahold of one.

 

Not to hi-jack the thread, but what would cause the temp gauge to read at only around 150 degrees? There's plenty of coolant in both the radiator and overflow. My car has been doing this since last fall. Any ideas?