Question about 1999 GMC Suburban

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2005 suburban blower intermitantly working

My blower is either not working at all in front, or stays on even when ignition is off. Controls are not controlling air flow properly either. It has a mind of its own. Air goes high to low and back again with no influence from me. It stayed completely off for a week or so and then started again on it's own. Now it won't go off. Rear air is working perfectly. (When it does decide to blow it is cold.)

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  • Anonymous Nov 26, 2008

    I have a similar problem: front blower doesn't work at all but rear works fine.

  • Anonymous Jan 09, 2009

    I have a similar issue with the blower motor being intermittant (1998 Suburban). It is located on the passenger side behind a black cover where a passenngers right foot would be. I found my connector to be worn. I just did some adjustments to the plug the get it to have good contact all the time. As to the issue with the blower motor coming on with the key off is a whole different problem. Somehow the battery bus is feeding this when it should not. I dont have a wiring diagram available, so I cant help there.



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  • GMC Master
  • 15,575 Answers

Automatic or manual climate control ? If automatic climate control the Blower Motor Control Processor is bad .

Posted on Aug 05, 2017


5 Suggested Answers


  • 56 Answers

SOURCE: Rear heat blows cold air

one of the second heater core lines is clogged.

Posted on Jan 05, 2009



  • 6 Answers

SOURCE: 2004 Yukon Denali

This is from the A/C Module located under the dash passenger side, check wether the internal fan is working if it is, then change the Module which is a small black part with two white metal blades like... and your A/C should work again...


Posted on Mar 21, 2009

GM Elec

Bruce Bracey

  • 1000 Answers

SOURCE: air conditioning blower stays on at all times.

Per your description, I believe you may have a blower fan relay that is stuck closed.
Remove the relay from the under-hood fuse center and see if the fan stops.
If it does stop, put the relay in slowly and see if you here the relay "click" and the fan come back on.
Let me know.

Posted on May 07, 2009



  • 85223 Answers

SOURCE: Air Conditioner Problem

the most common problem here is a defective air temperature control blend door actuator, this is what moves the door that controls air flow across the heater core or the ac evaporator core, to replace this requires u remove the dash assembly.

Posted on Aug 13, 2009

Testimonial: "good"

craig noteboom

  • 144 Answers

SOURCE: the rear a/c on my 1996 gmc suburban is blowing

the problem is in the rear expansion valve. this valve is located at the rear evaporator core. i am assuming the freon level has been checked and is ok. this is a common problem with these vehicles. hope this helps!!

Posted on Sep 04, 2009

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