TheYoungster

Made it about a mile this morning and noticed my temp was very high. Pic below. I pulled over let it cool back down and then took it back home to get a different car.

Any one else experience this? Are the two temperatures pointed to in the picture supposed to be the same? When I put my hand on the engine it didn't feel warmer than normal.

The car has been garaged during the cold weather so nothing should be frozen in the car. Any suggestions on what to check before I call the tow truck to get it to the dealer?

My C7 is Z51, M7

Thanks

BlueOx

No pic...what was the running temperature?

BlueOx

181 isn't very high for the C7 as I understand it. My old c6 ls2 runs over 200 quite often.

TheYoungster

Forgot the pic, just added

TheYoungster

Check the other temp indicator in the pic. I've never seen it go over 220, this morning if I didn't turn off the car the needle would have have hit the redline.

BlueOx

Hmmm, the two indicators certainly seem to be in disagreement. Did you get a warning light?

I'd drive it to a dealer asap until you get some sort of warning light.

Glenmcp

I do not know what the max safe temp is (the red line on the needle gauge is 255), but mine has never gone over 220 on the needle gauge. Seeing how one of your gauges shows 181 and one shows just over 240, you might want to ask your dealer about it.

Katech_Zach

Yes, those two temperatures should be the same. The gauge is probably reading incorrectly. I doubt you are actually running 250F in this ambient temperature that most of the country is seeing and with normal driving. Take it to the dealer.

MachAll 2005

Your battery voltage at 15.2V is also high ... ask your dealer about that.

Larry/car

I would say the digital readout is right. The analog, is still within range, though high, however the oil temperature would also start indicating higher than normal temperature. I wouldn't be afraid to operate the car, you actually have redundancy, two out of three are indicating normally.

lt4obsesses

At this point, your car is not exactly overheating.

I qualify as stating that I do not know all the little ins and outs of this engine as of yet. I do know that in pervious models the digital gauge and the analoge gauge are fed by two different sensors in two different locations. Als othat anologe gauges are not exactly linear. For example it is very common for the analoge to read much higher than the digital in the previous edition of the LT1 engine, though this is a different architecture. But, the digital read out is the more accurate, and important of the two.

But if it were me, I would cruise it in to my local dealer so they can look at it, and see what info they have. They can scan the ecm and get real time operational stats and see what's going on. If others are saying that gauge never goes above 220, then have it looked at.

The one question I would ask is, was this reading taking during prolonged sitting at idle, or moving down the road?

TheYoungster

It took 5 min to reach that temp from a cold start. By luck I just happen to look down and the needle was a hair below the red. I pulled right over and shut it off.

The pic I took was about 10 min after shutting it off, the needle had dropped a little away from the red line by that point. I'm certain had I driven even a few seconds more it would have been in the red.

sprtplt

Is this GM-good-enough? Um, no.

themonk

well if it happens again while you're driving, crank the heat and fan to full, roll down the windows and get to a dealer (not necessarily the dealer that you bought it from, go to the nearest one) and have them check it out pronto.

SteveSoCal

+1

Yes, that is very peculiar. Charging voltage should never go
above 14.4V on a 12V system.

Grab the old voltmeter and see if that is a true reading.

ORANGEC6VERT

I would keep an eye on it, but if the message center is not displaying any warning messages, the diagnostics must not think that temp is out of range.

Wormwood

Can the OP say whether or not his engine fan was running when he pulled over & shutoff the engine? I noticed my engine fan running last night when I got home & ambient temps were 35°F... Never saw my cooling temps. last night but will watch it today. I'm thinking if it needs to run the cooling fan now, it's gonna have hell when it's 105°F in July....

Pfadt Racing

What is the OP's ambient? To get to 250 after only a few minutes would likely be a false reading. With the thermostat still closed, it takes me a 10-15 minutes of idling to get to a decent coolant temp when its cold out.

Pfadt Race Engineering
888-972-2464
info@pfadtracing.com

JoesC5

I'm aware of the coolant temp sensor that is mounted on the drivers side head above the #1 sparkplug on the C6. Where is the second sensor located you speak of?



The analog temp gauge on the IP reads the same as the digital gauge in the DIC on my C6 Z06, and always has.

vetteLT193

He said the prior LT1, not C6. The old LT1 (1992-1996) had two distinct sensors. One in the front of the water pump (digital read out) and one in the block (analog readout).

If the C7's LT1 also has two then it could be an air bubble in the cooling system.