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I have a 2005 Chevy Cavalier and my temp gauge has been acting up. when i go to start my car up in the morning, the gauge has not dropped to cool. If I start my car, then immediately shut it off it will drop a few notches, and I will repeat this process until it is down to the 100. From there it won't show it is over heating. However if i cannot get it to drop all the way, it will rise according to the position it is in, and stay however many notches above cool it was above the 195. I also noticed that the gas gauge is starting to do the same thing with less regularity. We just replaced the engine coolant temperature sensor and the thermostat.

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Posted on Jan 02, 2017

  • 54 Answers

SOURCE: Intermitant temperature

Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.

Posted on Jan 20, 2009

  • 25 Answers

SOURCE: Temperature gauge problem on a 1987 Samurai

There's two sending units in the intake. The little on with single prong at the t-stat housing is for the guage and the bigger one plastic connector is for ecm.

Your signal is getting grounded somewhere.

Posted on Mar 17, 2009

  • 111 Answers

SOURCE: I have a 2004 Chevy

Hi I will try and help u if i can
Usually a shut down problem which happens at temperature is caused by an electronic part
breaking down.
I would suspect the coil pack ( usually a crack creates an open circuit, that is the crack opens up
when in your case 195 deg and closes back up when cooled down
I`m not totally familiar with your gm product but i know they used to have a problem with an egnition module ( but not sure if this is fitted to your car )
I hope i have been of some help to you
John ( South Wales UK )

Posted on Aug 10, 2011

Testimonial: "Your right ! it was an electrical part that closed back up after the engine cooled down! crank sensor ! easy fix ! except the 1st new one was faulty !"

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