Question about 2004 GMC Envoy

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I have a 2004 gmc envoy I need a diagram to show where the engine management & ignition is located, so that I can replace it.

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  • Freddy Sep 09, 2010

    Are asking where the engine computer is?

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The engine management system is the PCM, it is located on the driver's side of the engine, it has three large connectors. Why do you need to replace the PCM? What kind of problems are experiencing? The PCM rarely goes bad.

Posted on Oct 23, 2010

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Posted on Jan 02, 2017

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I have a 2004 gmc envoy and the security light came on what does this mean?


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Obd code P0105 comes up on my 2004 gmc envoy, need a diagram of engine to locate the map sender?


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My check engine light stays on, my instrument panel dings while driving the vehicle, the gauges drop to 0 and back up again, it switches back and forth from unknown driver to driver 1 repeatedly, abs light...


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May 10, 2011 | 2004 GMC Envoy

1 Answer

IM TRYING TO REPLACE THE THERMOSTAT ON MY 2004 ENVOY WHERE IS IT LOCATAED EXACTLY


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:

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

Mar 15, 2011 | 2004 GMC Envoy

2 Answers

Replace thermostat on 2004 gmc envoy


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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Coolant Temp Sensor


The sensor is located on the drivers side engine block...although you can see if from looking from the top of the engine, you would have to get under the vehicle and look up to replace it. Be aware that it takes a special tool to unscrew the old one and screw in the replacement.


Aug 06, 2008 | 2004 GMC Envoy

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