You have 4 relays that control the doors on your front vents. Open the glove box and depress the side to expos? the area behind it. There are 4 square damper controls there place the front A/C to vent and tap on them sometimes they get stuck mid cycle. If you believe they are bad, go to the junk yard and pull replacements. These tend to be expensive at the dealer. If this works you know where the problem lies and you can then buy new ones at the dealer. Good luck hope this helps.
SOURCE: Cool but not cold air from my ac system
It sounds simple enough that you need to recharge your A/C unit. They can stop functioning properly after winter's end especially if they were not used. You should be able to get a recharge kit from your local auto parts store. Your Suburban should use the newer R142a refrigerant.
SOURCE: Rear a/c not blowing cold, front works fine.
you may not have enough refrigerant. a low charge can cause the rear in this dual system to not work for beans. charge with a can of uv and find the leak. fix the leak. evac the system and recharge. i think you take 4 lbs, but check the accumulator sticker. you may want to just change the accum at the same time.
SOURCE: 1999 Suburban, A/C on warm air from front vents, cold air in rear
The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.
SOURCE: 2004 chevrolet suburban AC blows hot/cold at same time
You need to replace the drivers side temp actuator that is located on the left side of the HVAC box. It is retained by 3 screws and is fairly easy to replace.
SOURCE: have a 1999 GMC Suburban
There is a actuator motor not working .The actuator motor moves the temp door,it is located on the bottom of the blower box,under the dash ,in the middle,it is a flat box,with three screws holding it on,change this out and the problem will be fixed.If this was at all helpful,please rate thank you.
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