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Dual Climate Control: Passenger Side sporadically blows hot.

Tiny
SKUNTO
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 3.1L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 89,000 MILES
I have the manual dual climate control with the two vertical sliders to control temp. I noticed a couple weeks ago that the passenger side vents would be blow hot air despite the temp setting at full cold. By moving the passenger side temp control up and down, changing the temperature, I am eventually able to get it to blow cold air again. But eventually, after a couple minutes it will go back to blowing hot.

Do I need to replace the blend door actuator, the climate control panel in the dash, or is it something else?

Advice please. Thank you in advance!
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Wednesday, August 13th, 2014 AT 12:25 PM

21 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try pulling the hvac fuse for 60 seconds with key on then reinstall. sometimes it resets the actuators if not have it scanned for codes. that way it will tell if it 's the control or the actuators.

Also here is a guide we have on the subject.

https://www.2carpros.com/articles/replace-blend-door-motor
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Wednesday, August 13th, 2014 AT 12:28 PM
Tiny
SKUNTO
  • MEMBER
  • 2 POSTS
Thanks for the response. I just pulled the 20amp HVAC fuse in the fuse box in the glove box with key on. I replaced after 1 minute with key on position/engine not running, then restarted - same problem. Did I pull the correct fuse? In the owner's manual it says there is also an HVAC fuse in the fuse panel under the hood.
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Wednesday, August 13th, 2014 AT 2:31 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
See pic
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Wednesday, August 13th, 2014 AT 4:46 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Thanks will try. Replaced actuator on pass side to no avail. I thinking this fuse pull will rest and make it work. Ill give it a try.
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Monday, June 5th, 2017 AT 2:55 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
When actuators are replaced you have to do that in order to make them work. The fuse under hood is for the blower not the control unit. If still not working have a mechanic scan for codes as it may be a control problem not the actuator. An auto parts scanner cannot do this
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Monday, June 5th, 2017 AT 3:33 PM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
Okay kewl Man. Thanks.
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Monday, June 5th, 2017 AT 4:38 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hmac300 is one of our best

Please let us know what happens.

Cheers, Ken
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Thursday, June 8th, 2017 AT 11:33 AM
Tiny
DAN THEMAN JOHNSON
  • MEMBER
  • 10 POSTS
The fuse pull worked! Brilliant. Thanks. Dan J.
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Friday, June 9th, 2017 AT 6:55 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Glad you could get it fixed. Please use 2CarPros anytime we are here to help

Cheers, Ken
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Friday, June 9th, 2017 AT 4:25 PM
Tiny
PAUL FRIEDL
  • MEMBER
  • 1 POST
  • 2002 PONTIAC GRAND PRIX
Air Conditioning problem
2002 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 93.000 miles

The passenger side blows cold air and the driver side blows warm air (not hot or cold )
I have dual climate control and both are set to cool
How do I access system to see if doors are blocked
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
TRISHAJOVI
  • MEMBER
  • 3 POSTS
I have a 99 Pontiac Grand Prix. I have the manual climate control but I have the same problem. When mine does this, I just add refrigerant to the the system. You can even buy the refrigerant that has stop leak in it. That has really helped mine. It stops blowing cold with the far left vent and moves to the right. After adding refrigerant, it blows ice cold out of all of the vents. There is a small leak somewhere in the lines, but I will just add to it until I have to replace it. I hope this helps.
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
  • MEMBER
  • 0 POST
  • 2002 PONTIAC GRAND PRIX
  • 13,500 MILES
The car has dule heat the drivers side doesn't get hot or warm the passenger side works fine everything works but the drivers side no hit or warm air out vents or the floor what could this be a heater module or what
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
There is a bad actuator which controls the air vent door. You have to remove the heater box under the dash cnetr.
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
FELISJ
  • MEMBER
  • 1 POST
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 267,000 MILES
Air Conditioning problem
2002 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 267000 miles

I have cold air flowing on the passenger side of my car and warm air on the driver's side. The air refridgerant is fine. I have read that this has to do with the air control motor on the driver's side but where is this located?
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
The blend door is located in the air ducts, the motor is a dealer only part so you will have to have them do it.
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
HANNAHBNANAH
  • MEMBER
  • 1 POST
  • 2001 PONTIAC GRAND PRIX
Air Conditioning problem
2001 Pontiac Grand Prix Front Wheel Drive Automatic

I am having problems with my heating and air. Everytime I turn my air conditioner on it will blow out cool air on the drivers side and warm air on the passengers side and even when its cool on the drivers side it doesnt stay cold it seems to change temp with how fast im going. This problem also accurs with my heat, it blows out warm air on the drivers side but cold air on the passengers side. What is causing this to happen?
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
An electronic door that opens and closes to direct air to different locations is faulty.

You will have to remove dash to get to it.
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
POSEIDON215
  • MEMBER
  • 3 POSTS
  • 1997 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 130,000 MILES
Air Conditioning problem
1997 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 130000 miles

I have recently recharged the A/C but the drivers side continues to blow HOT while the passenger side will blow cold. I have tried turning dual climate on and off and turning the heat all the way up and back to cold thinking maybe something was stuck but I have not had any luck. What can I do to fix this problem so I have cold A/C on both sides?
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
POSEIDON215
  • MEMBER
  • 3 POSTS
I have posted 2 questions back to back and still have yet for anyone to even look at them while others have pages of replies. Please look at my 2 posts about guage cluster and dual climate system
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Friday, June 9th, 2017 AT 4:27 PM (Merged)
Tiny
INTEGERA
  • MEMBER
  • 1 POST
  • 2001 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 141,000 MILES
Why does drivers side ac not get as cold as passenger side?2001 gp with dual climate control
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Friday, June 9th, 2017 AT 4:27 PM (Merged)

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