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How to change thermostat 2002chev trailblazer 4cylnder

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Ivan, Trailblazer only came with the 6 or 8 cylinders. You probably have the I6 engine. I have found that removing the battery AND battery tray makes this job really easy. Must remove alternator and alternator bracket. Pretty forward from there, make sure you replace your temperature sensor also while you're in there, it's right above the thermostat.

Posted on Apr 19, 2017


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1 Answer

How to change a thermostat on a 2003 trailblazer

need to jack up and remove drivers side tire and using long extensions unbolt the thermostat housing from the lower side of engine or remove a few thing [alternator belt etc] and go through top its tight but the following link has video of both ways of doing replacement
How to replace thermostat 4 2 envoy or trailblazer

Jun 05, 2017 | Cars & Trucks

1 Answer

Where is the thermostat sensor located in a 2008 Chevy Trailblazer engine?

For the I6 engine, the actual thermostat is on the drivers side below the alternator. The coolant temp sensor is in a bad place. Approx 06' and up, they changed the location to the drivers side, wayyyy in the back. PITA to get to. 05' and older had it located right above the thermostat, was easy.

Nov 07, 2016 | 2008 Chevrolet Trailblazer

2 Answers

How much does it cost to replace it

What are you trying to replace?

Nov 26, 2015 | Cars & Trucks

1 Answer

How do i change thermostat

See picture below, thermostat is located on driver's side of engine. You will have to remove the alternator to get proper access to the thermostat.


Jul 22, 2012 | 2002 Chevrolet TrailBlazer

1 Answer

How to change a thermostat n a 2004 chevy trailblazer

Must remove the alternator and alternator bracket to access it. For the bottom bracket bolt, try using a ratcheting wrench for easier access, because there are A/C tubes there in the way. PITA job, but with patience it will go smooth. You may even replace the coolant temperature sensor while you're in there, it's 2 inches above the thermostat. You want this engine to be at a constant 210 degrees.

Feb 28, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

How to i change thermostat in 2005 trailblazer

The thermostat is located behind and slightly below the alternator on the drivers side. For the best access to the thermostat, you should unbolt and move the alternator to reach the upper bolt. The lower Thermostat bolt can be reached by taking off the front drivers side tire and reaching in with a 24" extension. The actual bolts are 10mm. Hope this helps...

Oct 03, 2009 | 2005 Chevrolet TrailBlazer

1 Answer

What do I need to do to fix my 2005 trailblazer. its reading a code po128

Change the coolant temperature sensor. If the code is still there, change the thermostat, it might be stuck open causing the engine to run cooler than it should.

Aug 29, 2009 | 2005 Chevrolet TrailBlazer

2 Answers

P0172 and P0128 Error Code 2003 Trailblazer 4WD

PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.

Jan 28, 2009 | 2003 Chevrolet TrailBlazer

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