No matter what is slected a small amount of air will come through teh other vents not slected ? i have also tried to remove the actuator and reset it with little change ? if it is the blend door not shutting all the way how do i go about correcting the problem and is it near the actuator by the sterring wheel . thanks .
Does the actuator make any kind of clicking noise? That sometimes indicates that there is a broken gear tooth inside the actuator. Are we talking about a little air or a lot of air? Sometimes junk does get into the air box and will stop the door from repositioning correctly. You can try that. Yes, the blending door is directly connected to the actuator.
SOURCE: Emergency brake actuator for 2001 GMC Sierra 1500
they used those on the full sized trucks and suv's so you might want to try a salvage yard..
SOURCE: i have a 1989 gmc sierra 1500 4x4 pickup and when
Check to see if the air supply to the other side is blocked or disconnected under the dash
SOURCE: 2006 gmc sierra , heater actuator
CHECK WITH DEALER, THIS IS A WARRANTY ITEM. BAD FRON FACTORY ON ALL TRIL BLAZERS, ENVOYS, AND DENALIS.
SOURCE: 2004 gmc 1500 sierra heater control stuck on
Defrost is the default position. Is the control a autyomatic temperture control unit? ( you set the temp and select automatic) if it is the system is completely electronic. You push the buttons and the control still says defrost or can you select something else and the control shows it but it just keeps coming out the defrost? If the control changes and the air comes out the defrost anyway and the cheack engine light isn't on, then the problem can be blown fuses or an air door actoater not working. Does the dash emit a clicking sound? if it does with the covers off the bottom of the dash reach around touching the different pieces till you touch the idem that is clicking. this is an acutor motor, or blend door motor. they have gears in them that wear out and break the motors aren't repairable and you just replace the ofending motor. the door that is moves can be stuck. and may have to be freed up with blaster, WD40, or other rust buster till it moves easy. maybe after getting the door to move smoothly you can get the old motor to move the door wiithout having to install a new one.
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