heater not working

2010 GMC ACADIA
50,000 MILES • 6 CYL • FWD • AUTOMATIC
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DANLENIUS
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My wife's Acadia is having problems with the heating system. First, it was blowing cold air on the passenger side and the heat was working on drivers side. I actually bought a new blend door auxiliary, but realized that controlled which vents would be used, so I didn't put that new one in. Well, now she said that it's not blowing warm air at all and I believe she said that the control for the vents wasn't working. So, before I tear it apart and not even know what I'm looking for, I want to see if anyone has a idea of what could be causing this and what I should be checking?
Oct 13, 2015 at 11:51 PM
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HMAC300
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try pulling fuse for hvac inside car first with key on. leave it out for 60 seconds then reinstall it may reset the actuators. if that doesn't work see if actuators are getting power, it may be a bad actuator if no power then get it scanned for codes by a pro. it may be the control head
Oct 14, 2015 at 7:20 AM
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DANLENIUS
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Thanks a lot! I will try those options and let you know how it went.
Oct 14, 2015 at 10:36 AM
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DANLENIUS
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Well, I'm actually sitting in her car right now. I tried resetting it and now I'm not sure what exactly was wrong when my wife told me, but now the heat works only on the drivers side and is blowing out of the floor and defrost vents. The passenger side only blows cold air. Also, it won't change to different vent selection. It only blows out of the defrost and floor vents on both sides, but the temp only works on drivers side.
I know that the actuator on the passenger side, controlled the vent selection, but does it have anything to do with the temp for the passenger side? I don't think it does, but I really don't know. If not, what controls the temp for the passenger side? Could there be something wrong or disconnected behind the actual temp control console? I was going to take it apart, but then I thought I'm gonna ask you first to see if there's even a chance of that happening.
Oct 14, 2015 at 7:07 PM
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HMAC300
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from your explanation it sounds like it is not an actuator. there are two shown in pic one arrow is for right side heat and two arrow is for direction or mode.try the reset one more time turn key on pull hvac fuse inside truck and leave it for 60 seconds. It can take for another minute for the actuators to reset so don't turn key off. If it continues what it is doing then take to a local pro and have it scanned for codes because it may be a control head or one of the doors have broken.
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Oct 15, 2015 at 6:04 AM
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GERLMIKE
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I have auto climate control. With separate heat setting for driver and passenger. I get heat o the driver side, but only cold air on the passenger side. Could this be aproblem with the heater door blender actuator?
Feb 23, 2019 at 5:59 PM (Merged)
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HMAC300
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the actuator, needs to be checked for sticking not operating.
Feb 23, 2019 at 5:59 PM (Merged)
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GERLMIKE
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Thanks, because I am taking it in to the dealer tomorrow for what I expect to be a $300.00 Bill. If it does not need to be replaced, maybe it wont cost so much. I will let you know what happens.
Feb 23, 2019 at 5:59 PM (Merged)
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HMAC300
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it should still be under warranty if you bought the extended warranty
Feb 23, 2019 at 5:59 PM (Merged)
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GERLMIKE
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I don't believe in paying money for an extended warranty. I take pride in maintaining my cars. And I drive very easy on the vehicle. As a matter of fact, the last car I had, I went 97,000 miles on my original front breaks. For what they wanted for an extended warranty, I just put the money in the bank, and it is there when I need it.
Feb 23, 2019 at 5:59 PM (Merged)
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GERLMIKE
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Just came back from the dealer. Actuator was checked for sticking. It had to be replaced. Total cost: parts and labor was 266.00
Feb 23, 2019 at 5:59 PM (Merged)
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HMAC300
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well that's good yu got away cheaper than you thought actually i forgot to tell you to complain to gm and they may have split the cost with you. due to not being that far out of warranty.
Feb 23, 2019 at 5:59 PM (Merged)
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DANCER 1984
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I have a 2002 gmc safari van and the heater is blowing cold air, the blower motor is working but no heat. I changed the thermosat, the van comes up to temperature but still no heat. heater core fine, is there a bleeder valve somewhere that is should be looking for?
Feb 23, 2019 at 5:59 PM (Merged)
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RASMATAZ
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Check the air blend door if its in the heat position
Feb 23, 2019 at 5:59 PM (Merged)
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SHANE GRANT
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My wife's car has heat from the passenger side vents but not the drivers side or in the back. Any suggestions to try?
Nov 13, 2019 at 11:56 AM (Merged)
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HMAC300
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pull HVAC fuse inside car with key on it may reset actuator to work on your side other wise have it scanned for codes by a mechanic.
Nov 13, 2019 at 11:56 AM (Merged)
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JERRYSTEWART
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The heater in our Acadia works great in the front. The rear blows cold. We have checked and rechecked all from and rear controls. No improvement. How does the rear heater get its heat, same as the front or a different delivery system?

Thanks,
Jerry
Nov 13, 2019 at 11:56 AM (Merged)
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KHLOW2008
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The rear temperature blend door actuator sounds like it has gone out here is a guide to walk you through the steps of changing it while give the location for your car below.

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Nov 13, 2019 at 11:56 AM (Merged)
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ZANYJB
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Ihad to replace the actuator cost me $78.00 all set
Nov 13, 2019 at 11:56 AM (Merged)