Analog Temp Gage Flat and engie coolant reading ---F
 

Hi all
I seem to have a similar problem. This happened 2x's in the last 20000 miles.
Driving along at highway speeds and I look down to check the gages and I fing the analog temp gage (likely running through the computer) falls flat - no reading what-so-ever.

Since it was warm out, I was using the AC. I also noticing it was blowing warm air.

Later that evening, while driving home I noticed the analog temp gage working and the temp read 189F. The AC also worked... hmmm...

What's more interesting is: no service or engine lights.

Sounds like an electrical issue to me? Any ideas? Temp sending unit?

Thanks!
Warren

Most people have had the issue traced to a faulty thermostat. Mine did the same as you are describibg and that's what the fix was.

Just ran in to same problem just like to know if there is a thermostat that are made the same as the gm one with out the rubber that cause the problem.. Like any other brand that cost less .. Thanks

The GM part is "competitively" priced.

GM part is only expensive at the dealership not so much online
ZZP for instance has them for $14.99

Thanks old blue .. I seen go for like 34$ just crazy for a stat.. What is the link for zzp thanksACDelco 12T103D Professional 180 Degrees Engine Coolant Thermostat with Gasket is this the one?

Stants go for $30ish.

Yup that's it $14.99

Pumpkin head as a shade tree Mechanic no reason on an HHR that you can't change out the thermostat in 30 minutes.

Pick one up at a local supply or dealer and get r done :)

At least that way you are out less than $30.00 buck and you know you have a good T-Stat in there. then if this continues chase down a sensor or bad connection.

Just an FYI I recently had the interior lights start turning on by themselves with all doors closed!!! Checked all the door switches etc, and nada, as someone mentioned previously, open that fuse/relay box under the hood and reseat every dang relay, fuse etc in there. After doing that I had no further problems.
And 90% of them moved! as in they were not fully seated.

Ahhh, Punkin Heads post was from 2007 - 8 years ago.