08 hummer H3 3.7L question about TEMP gauge!!

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Sep 26, 2019 | 04:30 PM

#41

hummerz

Senior Member

Joined: Jul 2012

Posts: 8,971

From: C-Town

Quote:

Originally Posted by Ismitty41

If I'm remembering correctly it was in the late 70s and when i got on the road is was in the high 90s

There you go again, you overheated, replaced the ect sensor on a hot engine, confirmed the same issue on a test drive, tested again at idle, all within the last couple hours. Now you can't just check your ambient temp on the rear view mirror.
Do you know where the ambient sensor is located?

Sep 26, 2019 | 04:34 PM

#42

Ismitty41

Thread Starter

Junior Member

Joined: Sep 2019

Posts: 25

From: Timberlake nc

It never overheated just got to 3/4 and I replaced the coolant temp sensor but no idk where the ambient sensor is but that wouldnt have nothing to do with the coolant temp would it?

Sep 26, 2019 | 04:44 PM

#43

hummerz

Senior Member

Joined: Jul 2012

Posts: 8,971

From: C-Town

Quote:

Originally Posted by amrg

218 is still fine if thats the max and with a/c. The pressure cap is 14LBs which means coolant (50/50 mix) shouldnt boil before hitting 260* + (not saying you should).

Still fine? Yes, you can also drive at 220°F, you could even drive with the temp higher. However, every time you run the temp higher than normal, you are causing excessive wear on the engine. I recommend to stay

Sep 26, 2019 | 05:02 PM

#44

hummerz

Senior Member

Joined: Jul 2012

Posts: 8,971

From: C-Town

Quote:

Originally Posted by Ismitty41

It never overheated just got to 3/4 and I replaced the coolant temp sensor but no idk where the ambient sensor is but that wouldnt have nothing to do with the coolant temp would it?

When diagnosing it helps to know the ACCURATE, ambient temp & iat, to determine a source of high ect.