Temperature gauge is in the red but not overheating

Tiny
CRUSNIKJ01
  • MEMBER
  • 2005 CHEVROLET VENTURE
  • V6
  • 2WD
  • AUTOMATIC
  • 159,000 MILES
So I have been fighting this problem for a while. Car seems to be overheating. Changed radiator, water pump, thermostat, thermostat sensor, bled the lines. The gauge still says red. But when I used a light thermometer to test the temperature of the engine and pips it reads 150 to 139 and looks like the radiator is pushing the antifreeze into the overflow reservoir. Saw what looked like bubbles coming out of the hose that goes from the radiator to the reservoir.
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Friday, January 10th, 2020 AT 5:47 AM

13 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

The pressure build-up and the bubbles are the clue.

https://www.2carpros.com/articles/head-gasket-blown-test

Sounds like you have a failed head gasket from the overheating allowing compression gases into the cooling system.

A leak down test will confirm. You need to remove the spark plugs and insert an air fitting into each cylinder one at a time. Then use shop air to pressure up the cylinder and watch for coolant movement in the radiator. That will confirm if a head gasket has failed.

Roy
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Friday, January 10th, 2020 AT 7:27 AM
Tiny
CRUSNIKJ01
  • MEMBER
I used a laser thermostat and shot it at the engine the pipes and it read a lot lower then what the gauge said on the dashboard.
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Friday, January 10th, 2020 AT 8:22 AM
Tiny
CRUSNIKJ01
  • MEMBER
And can you put the temperature sensor to far in?
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Friday, January 10th, 2020 AT 8:36 AM
Tiny
CRUSNIKJ01
  • MEMBER
And this morning I drove it to work the gauge said that I was in the red. I pulled over turned car off then turn it right back on and the temperature went down a little. Then when I started driving the temp started dropping fast.
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Friday, January 10th, 2020 AT 8:38 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, no, you cannot put the coolant sensor in too far.

As far as the driving, that is an indication of the head gasket.

You could try a thermostat but I doubt that is the issue.

Roy
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Friday, January 10th, 2020 AT 9:32 AM
Tiny
CRUSNIKJ01
  • MEMBER
I'm driving it right now not overheating.
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Friday, January 10th, 2020 AT 12:00 PM
Tiny
ASEMASTER6371
  • EXPERT
It will. You need to have this checked. My bet is you have a failed head gasket.

Roy
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Friday, January 10th, 2020 AT 12:05 PM
Tiny
CRUSNIKJ01
  • MEMBER
Me and my dad are testing it tomorrow. A mechanic told him about this stuff we can put in the radiator that may fix it.
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Friday, January 10th, 2020 AT 6:06 PM
Tiny
ASEMASTER6371
  • EXPERT
Do not do that. There is no additive that will stop a head gasket leak.

It will cause more issues. It will clog the radiator and heater core and compound the issue.

The best way is to fix it correctly.

Roy
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Friday, January 10th, 2020 AT 6:26 PM
Tiny
CRUSNIKJ01
  • MEMBER
Well, it is the gasket.
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Sunday, January 12th, 2020 AT 7:10 AM
Tiny
ASEMASTER6371
  • EXPERT
Just what I figured.

Make sure you do both gaskets, not just one.

Make sure the heads are checked for cracks and for being warped as well.

Roy
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Sunday, January 12th, 2020 AT 10:04 AM
Tiny
CRUSNIKJ01
  • MEMBER
We going to see what the dealership will give me if I trade it in and pay $5,500.00.
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Sunday, January 12th, 2020 AT 11:03 AM
Tiny
ASEMASTER6371
  • EXPERT
The repair will be around $1,500.00 to $1,800.00.

On a 15-year-old vehicle, it would be about $500.00.

Roy
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Sunday, January 12th, 2020 AT 11:13 AM

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