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Pontiac G6 Heating/Cooling

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Comments

  • gmcustsvcgmcustsvc Posts: 4,251
    Hi jessicajane,

    We are sorry if you are experiencing a weird smell in your vehicle. I see that you are seeking answers here on the forum for this concern. If you decide to visit a dealership for this issue please let us know, as we'd like to stay involved if a repair is needed. Please keep us posted on the status of your vehicle.

    Thanks

    Amber N.
    GM Customer Care
  • i found this forum while doing a search for the same issue, horrible horrible smell when the a/c or heat comes on and for a few minnutes when you turn it off. also noticing a moisture issue, the windows always fog, so has anyone ever found a solution to this? my car also is an 08 G6. seems like this problem goes all the way back to 08

  • ray80ray80 Posts: 1,637

    @beachinit46 said:
    i found this forum while doing a search for the same issue, horrible horrible smell when the a/c or heat comes on and for a few minnutes when you turn it off. also noticing a moisture issue, the windows always fog, so has anyone ever found a solution to this? my car also is an 08 G6. seems like this problem goes all the way back to 08

    First thing I always suggest is to check cabin filter if so equipped. Many times 'stuff' growing (or decaying) on it can be source of smell. you may also find it wet, not good

  • most of the things i have managed to find on this all say the 08 G6 doesnt have a cabin air filter

  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,076

    @beachinit46 said:
    i found this forum while doing a search for the same issue, horrible horrible smell when the a/c or heat comes on and for a few minnutes when you turn it off. also noticing a moisture issue, the windows always fog, so has anyone ever found a solution to this? my car also is an 08 G6. seems like this problem goes all the way back to 08

    The moisture issue could be because the compressor is running and your are in an area warm enough to condense some moisture out of the air. After sitting that will cause fogging on the windows for a while after the car is restarted especially if it's below 50 and the AC compressor is not coming back on.

    But is the smell like rank produce left in the produce drawer too long in the refrigerator? Or is it the smell of coolant seeping from the heater core. To check, I'm going to ask you to smell the coolant in your car. If it has a pressure cap on the reservoir wait until the car has been off half an hour or so and slowly and carefully remove the cap and take a sniff of that coolant. If it's a nonpressurized reservoir with no warning label about pressure, just take the cap off.

    Is that the smell you're getting inside the car? A seep in the heater core will also give lots of moisture that wants to coat the windshield as the air blows over the warm, damp heater core. Usually people complain because the moisture on the windshield gets enough coolant vaporized to it that it smears when trying to wipe it off.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • maddog0324maddog0324 Posts: 55

    I have an '08 G6 2.4L that used to have this problem. I went to the local Buick dealership and had them enable the "after blow" feature for the HVAC system and have not had the odor issue since.

  • i have a 2006 Pontiac g6. I can't get no heat from my car. on some days I get little heat. I can;'t drive my car in the winter months. I am at my wits end. can't figure this out. please any suggestions ?
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 56,774
    What have you done/checked so far to correct the problem?

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  • checked heater core. heater blower actuator.

  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 56,774
    So the lines going to, and coming out of the heater core are hot, or just going in?

    Or are the lines only marginally "warm" to the touch?

    Have you checked the coolant level when warm?

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  • the lines going in the heater are just going in.. the lines are warm to the touch, I checked the coolant level and its fine.
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 56,774
    so both entrance and exit lines are "hot" or just slightly warm, or is one hotter than the other?

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  • one is hot and the other is warm
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 56,774
    edited January 19
    OK, well that suggests a plugged heater core or a defective heater control valve. You can I believe access this HVAC system with the proper scan tool and maybe even test-operate some of it through the tool.

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  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,076
    A plugged heat as Mr. Shiftright suggests is a strong possibility if the DexCool was contaminated with old style green antifreeze instead of Dex or Mixes with all colors. Some Gm owners had success taking off heater hose connections and back flushing gently.

    However, I'd ask if your blend door inside the HVAC box is working right? Are you able to adjust the temperature with the AC on from mild to cold with air coming out of the front vents? The motor on those doors is a common failure point and an easy replacement if you can identify which one and are agile enough to lie on the floor to take out usually 1 bolt holding it on.

    You can try engine off but key ON and see if you can hear the door operating as you change temperature from cold to hot and back,waiting in between. OR you can take off the plastic shield under the dash, probably on driver side, look up at the side of the box and with key ON change the temp settings even with the engine on. Look for a center hub rotating as it adjusts. If you don't get that, you can remove the motor and try to operate the door manually with engine on to see you can adjust the heat that way.

    Sometimes you can identify the other motors by change air direction and recirculate and seeing which ones those are.

    You'll need to get a diagram to determine just which motor is the blend door. Do you have dual controls for separate temps for passenger? And some of the labeling on motors in rockauto.com are confusing because the same motor may operate the blend door and different identical motor may operate the mode door that switches heat/AC/defrost directions for the air.


    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

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