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Where is heater control valve on a 2004 envoy

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: location of the heater control valve

There are 2 hoses going through the firewall from the engine, these are the coolant hoses to the heater core, one is 3/4" and one 5/8", the control valve should be in the larger line (3/4") which is the inlet, make sure that the valve has vacuum (heater on low), also check and see if both hoses get hot with the heater blower on low, if they do get hot your problem is not the heater control valve but the air temp control blend door actuator.

Posted on Dec 28, 2008

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SOURCE: Gmc Envoy 2004 Seat heaters

I have the same problem with my 2004 HD Sierra. I found that the "MBEC" 50 amp fuse in the under hood fuse box had blown. Replaced that and it works now. This has happened twice in 2 years.

Posted on Dec 30, 2008

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SOURCE: How do i replace a heater control valve on a 2004 gmc envoy

Removal & Installation

Blazer, Jimmy, Xtreme & Bravada
The mode actuator is located on the top left side of the HVAC module.

  1. Disconnect the negative battery cable.
  2. Remove the knee bolster.
  3. Remove the right side driver knee bolster bracket from the steering column bracket and the intermediate bracket.
  4. Disconnect the vacuum connectors from the mode actuator.
  5. Remove the actuator rod retaining clip.
  6. Remove the actuator rod from the mode door lever.
  7. Firmly pull on the mode actuator in order to remove the actuator from the HVAC module.

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Posted on Feb 17, 2012

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