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Overheating

Tiny
ANDRES FLORES
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
My wife’s truck was overheating so I thought it might be the thermostat so I replaced it, but after she drove it the next morning to work it began to overheat again. Any thing else I should check that could possibly cause it to overheat?
Friday, January 19th, 2018 AT 6:10 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,329 POSTS
Hello,

If the coolant is full i would drain a little out and then test it for a blown head gasket which these vans had a problem with.

Here are two guides to help us find out what the problem is:

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

and

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Please run down these guides and report back.

Cheers, Ken

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Saturday, January 20th, 2018 AT 1:12 PM
Tiny
ANDRES FLORES
  • MEMBER
  • 5 POSTS
I checked it out there were no signs of blown head gasket. Is there anything else that you think it could be?
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Sunday, January 21st, 2018 AT 3:56 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,329 POSTS
When the engine is overheating do you here the clutch fan kick on it should sounds like an airplane taking off next to you. If not the fan clutch is bad nit pulling air through the radiator.

Here is a video to show you how to remove the fan clutch.

https://youtu.be/N_-MLVlBHk8

This guide can help as well.

https://www.2carpros.com/articles/fan-clutch-removal

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, January 22nd, 2018 AT 5:56 PM
Tiny
ANDRES FLORES
  • MEMBER
  • 5 POSTS
I see it spinning but I do not believe it is kicking on
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Monday, January 22nd, 2018 AT 7:33 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,329 POSTS
Ahh! That will do it my friend lets replace it and see what happens. It should fix it.
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Tuesday, January 23rd, 2018 AT 9:48 AM
Tiny
ANDRES FLORES
  • MEMBER
  • 5 POSTS
So I replaced the fan clutch and it still overheated so I also decided to replaced the radiator cap and it stopped overheating thank you for your help
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Tuesday, January 30th, 2018 AT 7:54 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,329 POSTS
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Wednesday, January 31st, 2018 AT 10:56 AM
Tiny
ANDRES FLORES
  • MEMBER
  • 5 POSTS
So I seeemed to be wrong it overheated again this morning any clue of what else it could be
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Wednesday, January 31st, 2018 AT 12:13 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,329 POSTS
Back to head gasket did you do the chemical test? A head gasket can be blown even though there is no coolant in the oil.

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

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Wednesday, January 31st, 2018 AT 12:25 PM

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