Question about 2001 Pontiac Sunfire

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Heater my windows in my car fog up. they never seem to clear. my heater, when on sounds like it gets alot of power and than slows right down, especially when i put my foot on gas or put my foot on the brake. I had a dexcool changed recently. any answers. thanks

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  • 2 more comments 
  • bmcz74 Jan 17, 2009

    THE HEAT IS HOT, WOULD THAT NOT MEAN THAT IT IS NOT THE THERMOSTAT?

  • bmcz74 Jan 17, 2009

    I HAVE THE HEATER BLOWER OUT AND THE NEW ONE I BOUGHT HAS 2 COLOURED WIRES, THE ONE I TOOK OUT HAS A PLUG. HOW DO I CONNECT THESE?

  • bmcz74 Jan 17, 2009

    I CLEANED OUT THE OLD BLOWER MOTOR. IT WAS FULL OF LEAVES. I TOOK MY CAR FOR A RIDE AND EVERYTHING WAS FINE. NO PROBLEMS, UNTIL I SWITCHED THE BUTTON FROM HEAT AT THE TOPAND FEET TO HEAT AT ANOTHER SEETING. WINDOWS FOGGED RIGHT UP. DO YOU THINK IT HAS ANYTHING TO DO WITH CONDINSATION FROM THE FLOOR?

  • bmcz74 Jan 17, 2009

    WHAT SHOULD I DO?

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  • Master
  • 1,990 Answers

You need to get the Thermostat Changed. This will stop this Problem.

Posted on Jan 17, 2009

  • 2 more comments 
  • Travis Humphries
    Travis Humphries Jan 17, 2009

    You did not say that before. You will need to check the Vents under the Dash and the Blower Motor for Problems.

  • Travis Humphries
    Travis Humphries Jan 17, 2009

    You have got the Wrong one. There are several that fit this Model Depending on Accessories.

  • Travis Humphries
    Travis Humphries Jan 17, 2009

    It should not make any Difference what setting it is on, The inside windows should not fog for Anyreason.

  • Travis Humphries
    Travis Humphries Jan 17, 2009

    The best way to Fix this is to Locate a Mechanic that has the Diagnostics Machine that will scan the Entire System and Tell him What is wrong and where. At this Point it could be any Number of Differt things. It would be Cheaper for you in the Long run to get it Scanned.

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1 Answer

My 2010 Chrysler 300 touring sedan has a problem with windows fogging up and even freezing from inside.


There is a drain for the heater plenum, it could be plugged up. Keeping water in the plenum. The drain is a rubber hose on the fire wall, on the passenger side. It just angles down. This will cause the fogged windows. You'll have to get it inside for awhile to thaw out, then blow air up in it to clear it. The other thing it could be is a leaking heater core.

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If it were a leaking heater core, the inside glass surface would have an oily film along with the fog.
It sounds like your fresh air intake is not working. You have to get fresh air from the outside to be able to get rid of the excess moisture inside the cabin. Or you have excessive moisture inside from a water leak that the system can't overcome.

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2 possibilities:
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2 - Leaking heater core inside HVAC box. Moisture from defog will smell sweet and be hard to clean off glass. Requires Dash removal and AC service to replace Heater Core. Very time consuming and Expensive A-Freeze fumes are also lethal if inhaled.

Try Solution #1 First, Least Expensive, Non-Lethal Condition.

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You kind of answered your own question,don't ya think?Run your fingers thru that fog on the window,does it feel greasy?If it is you probably have some form of coolant leak in the heater core housing.Take off the kick panel on the passenger side,put a bag or drop cloths down first!Check the foam that's used for sound dampening on that kick panel.Is it wet?Use a clean white cloth to dab at the liquid,what color is the fluid?The white rag will show you,clear it's water(leak at the windshield or housing).Green,coolant.I sure hope this helps,take care!

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Was there a smell along with it fogging up the window like antifreeze? If it did the heater core is leaking and needs to be replaced. It will be kind of a sweet smell.

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Fog on the windows is caused by moisture in the air condensing on the cold glass. You probably knew that. So the solution to your problem is to reduce the humidity in the car or warm the glass above the dewpoint. Running the AC will help because any moisture in the air will condense on the much colder evaporator coils before it gets to the windows, but as soon as you turn the AC off that moisture goes right back into the air. Fresh air from outside will help if the moisture level in the outside air is lower, which it ussually is in the winter. The only sure solution is to warm the glass.
You may want to check a service manual and see if there is an air filter somewhere in the cabin heat plenum. If so you may want to replace it. Defrosters and side vents should provide plenty of warm air to clear all windows and it sounds like your just not getting enough air flow. If you're not really into getting behind the dash and tinkering with the heater plenum, you might consider a small 12 volt heater like the ones available at auto parts stores, or you could just let the cabin warm up well before driving. There are also glass treatments that you can use to prevent fogging, I used one for years on a motorcycle helmet, These are ussually a wax and or soap base so they have to be cleaned off and reapplied periodically, but they do work well.

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