Question about 2003 GMC Envoy

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2003 Gmc envoy vortec 6 cylinder motor. where is the bleeder valve located on the motor? I yhave replaced the water pump and thermostat. Ihave tried to burp the system but am having trouble getting all the air out. I am told there is a bleeder valve on the motor.

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I dont heard about bleeder valve in the water/cooling system in this model; I am still not sure is the bleeding of the cooling system, manual says "disconnect the coolant air bleed hose at the throttle body".

Hope this helps.

Posted on Mar 31, 2011

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Posted on Jan 02, 2017

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How to change thermostat 03 envoy 6 cylinder


hey my friend the thermostat in not like others its a real pain here is exactly what you have to do if u have the 4200 vortec How to replace thermostat 4 2 envoy or trailblazer
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1 Answer

How do I replace a thermostat in a 2004, 6 cylinder, GMC Envoy? Where is the thermostat located?


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Aug 04, 2010 | 2004 GMC Envoy

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How to blead brakes on 2003 gmc envoy?


There should be a bleader valve located at each wheels brake assembly. Should be somewhere on the back side of the caliper. Have a second person inside the cab. With the vehicle turned off and the brake fluid cap removed, have the second person pump and hold the brakes. While holding release the bleader valve. Close the bleeder valve. Repeat above process until all air is out of the line. Repeat on the remaining three wheels. Make sure while doing this though you keep the brake fluid full.

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1 Answer

Does my cooling system have a air bleeder valve? I have filed my system with antifreeze, changed my water pump, thermostat and still it heats up quickly.


According to my data base it has one, but it doesn't give the location. The ones I've seen are located on the thermostat housing or on the engine close to it and they look like a brake bleeder valve.

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The thermostat on this vehicle's (the Envoy & Trailblazer are essentially the same vehicle) In-line 6 cylinder engine is on the driver's side of the engine, below & behind the alternator. It is not found in the typical location (which may be for the 8 cylinder engine), in an answer above.

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:

http://forums.trailvoy.com/showthread.php?t=54225&highlight=replace+thermostat

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1 Answer

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