Overheating

2002 CHEVROLET TRAILBLAZER
165,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC
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ANDRES FLORES
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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?
Jan 19, 2018 at 6:10 AM
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STRAILER
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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

Jan 20, 2018 at 1:12 PM
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ANDRES FLORES
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I checked it out there were no signs of blown head gasket. is there anything else that you think it could be?
Jan 21, 2018 at 3:56 PM
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STRAILER
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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
Jan 22, 2018 at 5:56 PM
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ANDRES FLORES
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I see it spinning but I do not believe it is kicking on
Jan 22, 2018 at 7:33 PM
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STRAILER
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ahh! that will do it my friend lets replace it and see what happens. It should fix it.
Jan 23, 2018 at 9:48 AM
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ANDRES FLORES
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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
Jan 30, 2018 at 7:54 PM
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STRAILER
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Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
Jan 31, 2018 at 10:56 AM
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ANDRES FLORES
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So I seeemed to be wrong it overheated again this morning any clue of what else it could be
Jan 31, 2018 at 12:13 PM
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STRAILER
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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



Jan 31, 2018 at 12:25 PM