Question about 1999 GMC Suburban
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.)
Automatic or manual climate control ? If automatic climate control the Blower Motor Control Processor is bad .
Posted on Aug 05, 2017
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
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
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
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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