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Pontiac Grand Prix Climate Control/AC



  • chad8chad8 Posts: 9
    2000 grand prix w/dual climate control...the drivers side blows hot air and the passenger side is good and cold. is there a damper or vacum line somewhere that i need to check or is it something else
  • geezer7geezer7 Posts: 1
    The switch that controls the fan inside the car does not work,i check the fuse,its fine.I hear the a/c compressor engaging.but,no air comes through the vents.
  • chad8chad8 Posts: 9
    i have gotten no response on this problem, but i did find out on my own that the dual climate control is operated by two seperate motors that control the dampers in this car....another thing to make sure and check if u have this problem even if u don't think u need to is to check freon because the set up on the vents on grand prix will blow cold on pssngr side and hot on driver's side if it is low.
  • msafritmsafrit Posts: 1
    I have a 98 Grand prix gt with the 3800 v6. I would like to add some compressor oil but cannot find the low pressure port. Can someone let me know where it is at. Thanks for all the help..Marty
  • wondering if you have fixed problem? did you have to replace one of the motors? I had the freon re charged so i should be good to go as far as that is concerned. thx
  • chad8chad8 Posts: 9
    i did not have to replace the motor(s) i had charged my ac about two weeks prior to this problem and thought that the motors were the problem but ended up i had a hell of a leak on the high side, i recharged the system along with a stop leak additive and so far so good....hopefully i make it through the end of the hot weather
  • I have an '03 GT with dual climate control (2 vertical levers). With the AC on, warm air comes out of the passenger side vents. When I move the passenger side lever up & down it starts blowing cold air again. Lately it takes a few tries & only lasts a couple minutes before the warm air returns. Any ideas on what's wrong?
  • 98 grand prix gt, 3800 v6, 130k miles, electronic duel climate control. I have the opposite problem as posted by chad8, a/c works fine on drivers side but hot air coming from the passenger vents. I'll be replacing the ambient air sensor mounted inside the front bumper as the readout for actual air temp is all over the place but the system tracks the readout correctly once it settles down, except for the hot air blowing on the passenger side. Last winter the climate control system/vent controls was making all sorts of hissing noises, as if adjusting itself constantly but more or less everything worked correctly (defrost settings, etc). I would appeciate any suggestions on what might be the cause of this problem. Thanks!
  • there are two motors which control the dampers on your system...I would first stick a thermometer in the vent and play around w/the temp controls and make sure it doesn't fluctuate one way or the other...if it doesn't, I would check the motor first.
  • Thanks for the reply and suggestions. By the way. replacing the ambient air temp sensor fixed the problem of erractic temperature readings. I'm really hesitent to take apart the dashboard to check/replace the passenger side air damper control motor, have read it can be a nightmare(lost retaining clips, etc)and difficult to get into the guts of the dash to get at the motor. Truth or fiction? Anyone have experience with replacing the motor? Any hints/tips would be helpfull, thanks.
  • still having problem...system is charged, replaced driverside temp sensor, visually see actuator arm moving(gears on outside of motor), and temp does change from slightly cold to hot when i adjust temp. After doing all this I noticed ambient air temp reads about 20 degrees cool compared to actual temp. gonna replace this tomorrow(had to order). Would this sensor reading wrong have anything to do with cold pass side/ warm driver side?

    kgnpeny... if you take kick panel, under steering wheel, off, and the metal steering wheel guard off, you can get a good look at actuator motor. Its a tight fit though.
  • I have a 98 GP GT with climate control. A few days ago my AC blower stopped. I turned off the car and restarted and it worked. A few days later it stopped and is dead. The climate control seems to be working (AC Compressor comes on, temp showing, all lights on and things change when I push the buttons.

    I saw a lot of discussion about the blower resistor but all are about the fan not working on certain speeds, none mention not blowing at all. Could anyone tell me if the resistor going bad could completely stop the blower in all speeds? I hope it is just the resistor and if not the blower motor. I really don't want to have to spring for a climate control assy.
  • I just replaced my blower motor. 2000 GTP with dual climate control. Im sure these dont have that resistor. The blower motor is located under the dash/ passenger side. Just take kick panel out and you will see it. It is only held in by three screws. If you got an advance auto parts by you get one from them. Theirs comes with a model that had connector with it. They dint have one for my year so I had to go to Autozone, and theirs I had to hard wire(splice). No biggie but just an extra step. This sounds like your problem. $100.00 for part. Good luck
  • I'm still driving my 89 Grand Prix. For the last few years, I have been getting weak air flow through the vents, whether the AC is on or if the heater is blowing air through the vent. I have replaced the blower motor which didn't help. All speeds of the fan are working. When I turn to the highest fan speed, the fan noise increases greatly, but the air flow out of the vents only increases slightly. I checked the intake to the blower motor and nothing is restricting any flow on that side of the motor. Is there a cabin air filter which may be clogged and if so where would that be located? Any suggestions would be appreciated as I notice a lot of questions go unanswered.
  • jebnjebn Posts: 1
    I have a 99 grand prix w/same air flow problem. Air comes out of floor, defrost, and vents. The direction of air flow does not change. let me know if you find out what it is.
  • I will post here when I find the problem. No sense in keeping good information from the group...
  • Hello,

    I've owned my 1998 Pontiac Grand Prix GT since it came off the Dealer lot in 1998. The only real problems that I've ever really had with it is basic wear and tear except for the replacement of the altenator 3x after having to replace the speakers. I have had the low coolant light come on, due to corrosion of the sensor. The only real problem I've had with my Pontiac Grand Prix GT is my Air conditioning system went out on me after 7 years of use in Florida weather and had to have a new compressor put in.

    Now for the real problem. My Air Condition is doing this absolutely weird thing of only blowing the cold air out of the passengerside vents and not the driver side. My Husband has taken the dashboard out of the car to try to find and fix the problem. Does anyone have any idea what could be causing this to happen? I'm thinking that the "flapper door" is stuck in one certain position causing it to only send the cold air to the passenger side instead of both sides, but would like to know what/if there are other possiblities that may be causing the problem.

    Any suggestions would be greatly appreciated.


    P.S. My low coolant light is still on even though everything else has been fixed.
  • make sure your ac is fully charged because low freon will also create this problem
  • Well, my husband said more than likely not low freon as the passenger side is like a meat locker. The air blows evenly and forcefully through both passenger side and driver side vents. Only the driver side is blowing "warm"/non-cooled air through the vents. The other things is there the system is only a one core system with a common evaporator. The problem has to be in the air flow doors or in that general direction as to the problem. He said he may be wrong as to what he thinks the problem is, but has checked the freon and it is fully charged. The a/c had to be fixed a couple years ago as the compressor died and the a/c system was taken apart and parts replaced by a reliable GM certified mechanic. Any other ideas however, are greatly appreciated since my husband is already working on the problem and is going through and checking the most logical areas where the problem could originate.

    Cherokee Rayne
  • I had the same problem. Short answer is it was low on freon. This will cause the problem. I had cold air pass/ warm driver. I had system recharged @ Valvoline, but they must not of done it properly. So after that I changed out...ACC unit, checked actuator, changed driver side temp sensor, changed outside temp sensor. Finally took it to my mechanic and he said he just added more freon. Blowing out freezing cold both sides!! If that is not your problem then the first thing I would check would be driver side actuator if it is an automatic dual climate control system. not sure if it is same on your car( i have a 2000) but it is fairly easy to get to. Remove kick panel under steering wheel, take steering wheel kick panel off(metal one). First time took awhile to take out, when I re checked it, took about 15 mins. Search "Morads" on ebay. He deals in used parts and has theses available.
  • FYI, the problem was a faulty passenger side actuator/motor.
  • red97red97 Posts: 1
    I have a 97 grand prix, first problem was that the fan motor quit replaced the fan motor, at first the unit worked fine now I only get an air flow (hot or cold) on fan stting 5. I have read on this forum about where the fan motor resistor is located but that appeared to be for newer gp's. Is this location (behind & left of the motor) accurate for my year as well? Sales person at part store said it would be behind the selector switch under the radio, after an hour of work found he was way wrong. Your price was accurate the resistor is only about $25.00
    Please help,
  • The heating in my 2002 Grand Prix is not working as it should. Now that fall has arrived, I've noticed that its taking much longer to heat up, and the temp is not as hot as it should be. I've also noticed that when it does heat up (warm/not hot), it sometimes reverts back to a cooler temp. I recently replaced the resistor that caused speeds 1 & 2 not to work, but that should not impact the temp. Any ideas?
  • I forgot to mention that the car has Climate Control (3 wired blower).

    The car is my son's and he is away at college. He just called and the blower is completely dead, the connector is melted. Earlier he was able to get it running by wiggling the wires and the connector made contact. He didn't tell me that he had to keep doing this though. He is frantic and hot since I am not there and have no idea what it looks like. Does anyone know if the connector is wired to the blower and can be replaced? He said that it looks like it is part of a plastic housing.
  • in my 05 GP i have the 3.8l non-sc and my heat doest get hot as it did, the temp ride a little lower than normal what do you think
  • So I thought i'd throw this out to everyone...i have an 04 GP GT and the heat decided it doesnt want to work. The blower still works and I was thinking it was the thermostat stuck wide open. Changed it since it was simple and that didnt fix the prob.

    Im guessing it's probably the heater core? Has anyone changed this or have a link to a step by step on changing this. To answer some questions ahead of time....there is no coolant leaking into floorboard, there is definitely coolant in resevoir, and heat blows just barely warm...not hot like it should.

    Thanks in advance...
  • I have a 2004 Grand Prix,,,Looking at the b/m resistor,,It looks like it is pop-riveted to the blower housing. Are they pop rivets? How is the resistor removed,,,,Thanks
  • So I have not had heat for the past 2 months. Well, i live in Pittsburgh and well its winter time here. So here is what i have learned in researching this FAN problem.

    If you have the issue of your Blower NOT working on speeds 1-4, this is probably your Blower resistor part. (a bit difficult to remove, but doable, price $25)

    If you have the issue of your Blower NOT working on any speeds 1-5, this is going to be the Blower motor resistor or the Blower motor (very easy to uninstall and reinstall, price $50-$150, pending manual or automatic climate control).

    If you have the issue of multiple things going wrong, HUD, Heated seats, Daytime running lights shutting off, rear defogger - This is most likely your Ignition Wiring ( i think the yellow and orange wires) thing that you read about on here.

    I hope this helps, or at least saves you some diagnostic towards your problem.
  • I have no heat in my grand prix. I have taken it to the mechanic twice now, they said the heater coil is fine and the first time they replaced the thermostat because they said it was broken and that should fix the problem. then a week later i took it back because the heat never came on. they then told me that i probably have a blockage in my engine coolant lines so i had my anti-freeze flushed out and then refilled. I still have no heat in my car and i am down $300. right now i am not concerned about the money that i have spent, i just want the heat in my car to work. i live in upstate new york and i am tired of wearing multiple layers in order to stay warm on my morning commute. does anybody have any advice on what i should do next. what else would be causing my heat to not work. all that is coming out is cold air so i dont think it could be the blower. i am a handy guy and i want to take a look at it myself tomorrow. any pointers on how i should approach this would be greatly appreciated... thank you..

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