Temperature Gauge

PIANO DUDE

MEMBER
1993 CHEVROLET S-10
4.3L
117,000 MILES

The temperature Gauge does not function. It just stays at 100. The engine seems to run fine. No knocks or other sounds. I did just replace the altenator about 2 weeks ago. I noticed the temp gauge was low about 2 days ago. I checked the hose into the radiator and it feels warm after running for awhile. The other gauges work fine. Is there a fuse on the temperature gauge circuit? Could the thermostat be stuck? I would think if the thermostat was stuck that the gauge would still rise to a normal level once the engine ran for awhile. I tried to trace the wires to see if anything was disconnected but it all looks ok to me. Thanks in advance for the help. :Lol:

3 Replies

BLACKOP555

MECHANIC
10,371 POSTS

I think you may have a bad coolant temp sensor or coolant temp sending unit or a stuck thermostat open. I would check the thermostat first here is a guide to let you see what you are in for when replacing the thermostat.

https://www.2carpros.com/articles/replace-thermostat

and here is the engine coolant temperature sensor guide

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Please let us know what you find.

Cheers

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Wednesday, October 31st, 2007 AT 7:31 PM

MICHAEL26

MEMBER
7 POSTS

I just replaced a v6 motor in a 1993 chevy s10. I am having problems now after 2 days after replacing motor, far as engine idling high. I had three things in mind, first thing was TPS, second coolant temp sensor, and third the auto air control. Now I unplug the temp sensor it wants to idle way low then idles way back to high. With it unplugged it will not start at all, I plug it back in, and I unhook the TPS doesnt change anything. Far as the auto air control to. What could my problem be? I was told the coolant temp sensor can affect the idle speed. Its making transmission shift hard and takes longer to shift into the gears. Can anyone help me out on this?

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Wednesday, November 9th, 2011 AT 4:38 AM

KEN L

MASTER CERTIFIED MECHANIC
47,256 POSTS

A plugged catalytic converter can cause the problem. Here is a guide to confirm the issue.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please let us know what you find.

Cheers, Ken

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Tuesday, January 9th, 2018 AT 6:29 PM