Question about 2002 GMC Sierra

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Low air flow trough dash air vents,heater a/c fan speeds are OK.just not enough air blowing out. Thank you

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: There is no air flow

You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!

Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!

The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!

I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!

Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!

3 on the Drivers side and 2 on the Passengers side!!

But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!


Posted on Jul 22, 2008

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  • 37 Answers

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

  • 4 Answers

SOURCE: Heater on driver-side blows barely warm air other vents blow cold

the most probabale cause of this would be a disfunctional hear core if you replace your heater your heater will more than likley work the the way it's supposed to

Posted on Jan 18, 2009

  • 2920 Answers

SOURCE: 2002 GMC Yukon blows cold air from the front, rear works fine

check you antifreeze level and make sure its full

Posted on Jan 26, 2009

  • 8 Answers

SOURCE: no air, ac, heat out of in dash face vent

I changed my switch..on my dash...that controls the different settings. All settings work fine now.

Posted on Feb 03, 2009

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You may want to check on the vents for it can be closed half way. If the vents are good then the problem will surely be on the blower itself. It can be worn out that's why the blower motor blows weak. Once replaced I believe you'll be good.
Hope this helps and thank you for using FixYa! Have a good one!

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My ac only blows cold air out the driver side vents the other vents just blow air. there is no loose duck work and i dont have digital controls only one knob that works the fan speed


If the freon is low this can happen,also,there still will be a door actuator motor that controls the vents,it is in the dash,and the dash would have to be removed to replace it.If this was helpful,please rate,thank you.

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A/c suddenly stops blowing


Maybe your blower fan is faulty.
The whine you heard could be dry/seized fan motor bearings or foreign matter (such as leaves/twigs) in the fan.
If fan motor is faulty it will need to be removed for repair; but first check as below:-

1) Check fuse is ok.
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