Question about 2003 Chevrolet TrailBlazer

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Replace thermostat, Used to be the simplest job on an auto. Am I correct that I have to remove the Alternator to get to it? Meaning its down on the block itself on the drivers side. Ouch

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Yes sir, you are correct. The thermostat is behind the alternator. Be very careful any time you are working on or near the fan clutch assembly. It has hidden wires, It looks like a regular viscous fan clutch but is computer controlled and is realatively easily damaged. For your own reference - Be prepared in the near future to replace it and the air switching valve due to a check engine light.

Posted on Nov 20, 2009

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  • j_m30303 Dec 23, 2010

    not true for all. Mine is on the passenger side behind the power steering pump



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The thermostat on this vehicle's In-line 6 cylinder engine is on the driver's side of the engine, below & behind the alternator. You have to remove the alternator to gain access to the thermostat housing. You also need to disconnect the battery before you remove the alternator to avoid sparks and shorts.

Most directions outline removal of the alternator to gain easy access to the hose clamps, bolts and housing of the thermostat. I have located a site that after free registration, has detailed instructions on how to do this job, and the link below that describes an easier method with photos. Check out:

Mar 15, 2011 | 2004 GMC Envoy

1 Answer

Need steps on replacing thermostat on 2002 Envoy

Just replaced my 2005 envoy thermostat, and it might be the same. Here is what I had to do.
1. First, the thermostat was located on the driver side behind the alternator. The hose comes from the bottom of the radiator, not the top like most vehicles I have worked on.
2. You need to remove the belt by taking tension off of it. The tensioner is on the passenger side, under the steering pump. I used a socket wrench, placed in in the square hole on the tensioner, attached a pipe for leverage to the socket, and pulled until the belt was loose.
3. Next is removing the alternator. Best if you first disconnect your battery, as there is a hot line to the alternator. Disconnect the wiring harness located on the top. Remove the bracket bolts that hold the alternator. You might want to place something under the alternator to prevent it from damaging the small wheel under it as it will be heavy and free after you remove the bolts. I also removed the bracket to get full access to the hose and thermostat. There is a red wire that connects to the alternator, remove it and now the alternator can be pulled out and set to the side.
4. Once all this is out of the way, you can remove the hose to the thermostat (I assume you have drained the radiator).
5. Remove the two bolts hold the thermostat to the engine.
6 Replace the thermostat and reverse the order of the steps above.

I read that some can do this without removing the alternator or just loosening, but it is tight and makes the job a lot harder.

Hope this helps...Joe

Mar 06, 2010 | 2002 GMC Envoy

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