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Pontiac G6 Heating/Cooling

howardpmhowardpm Posts: 28
edited April 2014 in Pontiac
So I'm a bit confused how the AC in the G6 works.

I turn on my car with both knobs on auto and the Air Conditioning light goes on. Now as far as I know most people aren't turning on the AC in the winter, also you tend to get worse gas mileage with this on. So I always turn it off.

Now it says in the manual the air conditioning compressor runs when the outside temperature is over at 40 degree F. Why would I want the AC on when its 40, maybe if its 80 or higher.

It also states when the air conditioning is selected or in AUTO mode, the system runs the air conditioning automatically to cool and dehumidify the air entering the vehicle, Again, if its cold outside why would anyone want the AC on it.


  • Hey all,

    I got my 2008 G6 at the end of January. Being that the weather has started to be warm, I've been using my a/c the last two-three weeks. However, the air is never cold.

    I decided to bring my car in to have it checked out last Monday. They said they couldn't find anything wrong, but they would recharged the a/c for me. When I picked up the car the morning after and turned on the a/c, it was slightly colder -- but still not cold enough.

    I have a 45 minute commute to and from work, so I've had ample amount of time to test the air conditioning out. I tried several methods -- recycled air, incoming air, flushing the hot air out of the car and then turning it on, etc. Nothing really works. When I'm using incoming air, the air is slightly colder -- but it's more of a "cool" than a "cold." And when I'm using recycled air, it's just flat out warm. I've tried everything during my 45 min commutes. Nothing improves it.

    I had a Civic sedan before this and I remember the A/C getting so cold I would have to turn it off. I wish this was the case for my G6, but it never gets cold enough. It's roughly 75 degrees outside; I can't imagine what it's going to be like once it's 90 degrees out.

    Are there issues with our G6s that I am unaware of?
  • busirisbusiris Posts: 3,490
    This should be a simple issue to either prove or disprove, and here's how...

    On a warm day (70 +F), turn on the A/C and place a thermometer immediately in front of one of the air outlets. Cold air coming out (in the neighborhood of 45 F)?

    If no, you have a problem with the compressor, condenser, evaporator or duct work. Take it to the dealer and reproduce the test in front of a service representative.

    If yes, the system is operating nominally.

    Still, I don't know why they would add Freon to the system unless it was below specs. On a 2008 model, it begs the question....why is it low?

    Makes me wonder about the quality of service that your dealer is able/willing to provide...
  • Anytime the AC light is lit on my 2008 G6 I have a really gross smell from the vents. The dealer said this is normal and I find that hard to believe, it only happens when the AC is on, when its off everything is good.
  • bvdj84bvdj84 Posts: 1,724
    Wow! How is that normal? Uh, I have an 08 G6, and I have no gross smells. Why would they not want help you out, since GM would be the one having to fund the solution for it. I would recommend you calling GMAC and filing a report, perhaps using another nearby dealer that might work with you. You would be suprised at when I went to one dealer, they were less than helpful, and then went to another dealer and they treated me so well! Somebody is not doing their job. Weird smells coming from the vents is NOT WOW! I think dealers have used every line in the book, but if you want to buy a car, well their on it, but once you buy it, drive it off the lots, its your problem...

    Anyhow, do that, Good Luck!
  • Karen_SKaren_S Posts: 5,092
    I've seen this complaint with several make/models. A lot of the times it is due to a plugged drain. The moisture builds up, mixes with bacteria, and you end up with a funky mold growing in the system. I'd take it to another dealer for a second opinion.
  • My 2007 G6 GTs have a flatulence dispersal system, aka top down. We can't help it if you don't have the good sense to keep the top down. Blaming it on the AC is a neat ploy, though. ;-)


    P.S. A girl I knew 54 years ago liked my white one a lot. She got one in granite for a wedding present, proving the car is a really, really good chick magnet. Happy days are here!
  • I am not sure if the G6 has a "cabin" air filter or not. I had the same problem a number of years ago with an Olds Silhouette minivan. After the car was 2-3 years old, I had the same problem. I looked in the owners manual, and found out there was a cabin air filter. It was inside the glove box, but that location can vary from car to car. I opened the case for the filter, and needless to say the filter was quite dirty. I went to an auto supply shop and purchase a new filter ($15). Changed the filter and presto - no more smells.

    I have now learned to check for a cabin filter on every car I own. I change them once per year, generally at the start of the air conditioning season. No more smells in any car. You would be surprised by the amount of dirt on these things after one year.

    I also have noticed that while many owners manuals show there is a cabin air filter, in almost every case or car, there is no recommendation to change it.

    Hope this may solve your problem

  • gtp2gtp2 Posts: 1
    I had this problem with an 08 Grand Prix at about 15,000 miles. It started off with everytime I turned on the air conditioning, a moist, moldy smell would emanate from the vents, until it began happenening even with outside air coming in unless the heat was on. I called the dealer and they stated I needed to replace the cabin air filter for a cost of $30 to eliminate the problem. A few days later when I took the car in for the scheduled service, a technician and service manager turned the air conditioner on full blast and stated they didn't smell anything and that the odor coming from the air conditioner was normal on every car, regardless of the fact a terrible pungent odor was coming into the cabin.

    I told them I wanted to replace the air filter regardless, and they then stated their was a $100 labor fee plus the $30 part. I told the service manager there is an obvious unusual smell coming from the air filter and if he doesn't replace the air filter for the promised cost, I would call my attorney. The service manager then told me to call whoever I wanted to. My attorney wrote them a certified letter describing the promised price and the health risks that create associated liabilities, and a week later the General Service Manager called me back and sheepishly apologized and told me they would fix whatever needed to be fixed with no cost to me.

    When I took the car in, they provided a loaner, shampooed and pressure cleaned the vent system and replaced the cabin air filter. The service manager said it happens every now and then but it's unusual for it to happen at 15,000 miles. On the service receipt it said mold was in fact present in the vent system and the cost would have slight been over $200. I suggest you have them look at your issue closer.
  • catkccatkc Posts: 10
    The first year I had my convertible I noticed the bad smell. I took some antibacteria spray and sprayed it down the vents several times and it seems to have taken care of the issue in my vehicle (2007 G6 Convertible)
  • i love my g6 except for that SMELL! I thought it was me at first!!! my girlfriend also smells it so i know it is there. I am going to the dealer I purchased from last february,altho they took 6 months to get me a new rim (noticed day after i bougt it front end shimmy also had to replace a part for one of the wings) if I do not get results from them i hope the pontiac dealer will help me. it is not very pleasant to have to smell mold soooo top downwhen i can western ny does not let that happen often
  • I have a rotten egg smell that comes from the heater being turned on.
  • maddog0324maddog0324 Posts: 55
    So your windows won't fog up.
  • I have the same smell, it smells horrible.
  • maddog0324maddog0324 Posts: 55
    I had this problem with my 2008 G6. I did some research and found that there is a feature that runs the HVAC blower for a couple of minutes after the a/c has been running and the vehicle has been turned off. The feature called "Afterblow" is available from the factory, but must be enabled at the dealer. I had it enabled in May and have not experienced the musty smell since.
  • I have a 2005 G6. I was just told that it will cost me in the neighborhood of $600.00 to repair my heating. Seriously?...the car is only 6yrs old! Why did the heating system seem to fall apart?
    The fan is working fine...high to low....floor to defrost, but no heat. Is there any recall on this problem?
  • gmcustsvcgmcustsvc Posts: 4,252

    I apologize for the problems you are experiencing. Are you currently working with a GM dealership or an independent shop? I would be happy to see if your vehicle has a recall, please email me your VIN.

    You can get my email by clicking on gmcustsvc.

    Thank you,
    Caron, GM Customer Service
  • Here is my VIN: 1G2ZG528154168365
  • Sorry to not answer the question....I was at an independent shop that had recently fixed my ball bearings for me. I trust in what they say but don't have the money to fix my heat and was looking for a free help guide so I could try to fix it myself.
  • howardpm,

    I had this problem with my 2008 G6. I did some research and found that there is a feature that runs the HVAC blower for a couple of minutes after the a/c has been running and the vehicle has then been turned off. The feature is called "Afterblow". It was installed at the factory as inactive and must be enabled at the dealer. I had it enabled on my 2008 G6 in May (cost $50) and have not experienced the musty smell since. GM had issued Technical Service Bulletin #99-01-39-004B that lists enabling Afterblow as a solution to the musty odor complaints. I hope this helps.

  • gmcustsvcgmcustsvc Posts: 4,252
    I would also recommend contacting your local dealer again for more assistance. If you are having problems finding resolution, I would recommend contacting Christina by email. She should be able to look into this further. Thank you in advance.

    Tricia, GM Customer Service.
  • msikor01msikor01 Posts: 3
    2008 Pontiac G6 GT Convertible w/3.5L
    Occaisionally, after driving the car with the AC on, and working, you make a stop for 10-15 minutes, and when you start the car, the AC will not come on for quite a while. It seems to be more prevalent on hotter days, 85+.
    Dealer has checked it out twice and cannot find the problem.
    I do know that when there is no AC, the compressor is not engaging.
  • gmcustsvcsarahgmcustsvcsarah Posts: 1,964
    I'm sorry to hear about this elusive problem with your G6's air conditioning. Has your dealership ever been able to duplicate the situation you're describing, or is the event too intermittent to be predictable?

    GM Customer Service
  • msikor01msikor01 Posts: 3
    It was replicated during one service call, however, the repair performed (system pressure check) did not correct the issue. The last time we had it in, the weather cooled off and the failure could not be duplicated. It is going in for service on 7/18. The temperature is forecast to be in the mid 90s, so that should help.
  • gmcustsvcsarahgmcustsvcsarah Posts: 1,964
    I hope that everything goes well for you tomorrow and am looking forward to hearing any updates.

    GM Customer Service
  • hi, i have same problem in my car . you find a solution for this problem?
    Please let me know, i buy car for my daughter and have same problem
  • Sorry to hear that you have the same issues, carlos42! Hopefully msikor01 will update us on what her dealership found. Were you planning on getting this looked into or not yet?
    Sarah, GM Customer Service
  • For a while I've noticed a puddle under my car, I always assumed it was the a/c no big deal. Recently it has started to get colder and I've started using my heat, everytime I turn it on for the first time like overnight, it stinks. Smells kinda like vinegar. Now when I turn the heat on it smells like its burning and I'm hearing a terrible squeak from the front passenger side of the car. Any answers?
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