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Fogging windows why - Blazer Chevrolet Cars & Trucks

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Should always include make and model and year. BUT it sounds like you have a bad heater core. Let me know more and I can walk you through some easy tests and or replacement Cheers from Nova Scotia!

Posted on Jan 16, 2013

  • 5 more comments 
  • tlready
    tlready Jan 16, 2013

    the mechanic tells me nothing is leaking

  • tlready
    tlready Jan 16, 2013

    i have a 2009 chevrolet trailblazer LT bought in april2010

  • tlready
    tlready Jan 16, 2013

    can they test if the heater core is bad i smell something but they tell me if it isnt a sweet smell it isnt antifreeze i told them it is a nice smell and it upsets my stomach

  • jamiem1416
    jamiem1416 Jan 16, 2013

    Yes I'd say the heater core is bad, or a loose hose going to it. Check your coolant level first. Your heater core doesn't always put out a sweet smell, ha ha . You can have the truck pressure tested to pinpoint the problem. . The cooling system should hold 60 psi. Even if your fluid is not going down, the heater core can put out steam. I'd say that is your problem. Let me know if you get it pin pointed and I can walk you through the replacement. Hope this helps Cheers from Nova Scotia!

  • jamiem1416
    jamiem1416 Jan 16, 2013

    Did the mechanic do a pressure test?

  • tlready
    tlready Jan 18, 2013

    not to sure but they tell me it isn't the heater core or i would smell a sweet smell and it isn't leaking i am getting furustered with them i just bought this in april and i feel it shouldn't have passed a safty if the windows are fogging up

  • jamiem1416
    jamiem1416 Jan 18, 2013

    Get a new mechanic!!. You don't always smell a bad heater core. Seriously get a new mechanic. If a heater core is plugged or even partially pluged it can also cause the windows to fog up, as can a leaking AC unit. I would take it to another place and don't ask them, tell them you would like a pressure test, than an opinion. In that order. The only other thing that it could be is moisture getting into your car from up top somewhere, but very unlikely. Sometimes the coolant system can have let's say an air pocket. These air pockets can be in a heater core and when the pressure builds up, it can blow steam through a tiny hole or even the seams of the heater core and make the windows fog up. I've seen this twice in 28 years. Could be the case. You still haven't said what make and model your car is. That may make a difference. Especially if it's a VW. Let me know

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