Overheating problem

JDP1183

MEMBER
2003 CHEVROLET TRAILBLAZER
V8
4WD
AUTOMATIC
130,000 MILES

My truck just started over heating. It runs good but the temp gauge rises very fast. Whats going on?

Saturday, January 31st, 2009 AT 12:25 PM

4 Replies

RHALL77

MECHANIC
3,361 POSTS

Hello,

This sounds like the thermostat is stuck closed which is common here are two guides to help you fix the problem with diagrams below to show you how on your car.

This guide will walk you through the repair with diagrams below.

https://www.2carpros.com/articles/replace-thermostat

and

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

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

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Tuesday, February 3rd, 2009 AT 7:56 AM

AQUAMAN50

MEMBER
1 POST

Thank you for this post I had this problem and had to get a thermostat from Amazon for $32.00 all fixed I love this site.

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Friday, August 2nd, 2019 AT 4:05 PM

HEATHER MCMURRY

MEMBER
1 POST
2002 CHEVROLET TRAILBLAZER
4.2L
V6
4WD
AUTOMATIC
190,000 MILES

In the fall temperature gauge started to raise I have yet to let it overheat. It was okay in winter because of cold temperatures. Now that it is hot out have to address the issue. Top heater hose from radiator is warm bottom will burn your hand is this a sticky thermostat? I don't have the money to chase problems on this car. I have had it for eleven years.

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Friday, August 2nd, 2019 AT 4:05 PM (Merged)

JIS001

MECHANIC
3,408 POSTS

Verify cooling system is full. If low on coolant then pressure test the system to check for leaks. If any leaks then repair and recheck. Verify fan is working properly. If all is okay then replace the thermostat.

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Friday, August 2nd, 2019 AT 4:05 PM (Merged)