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Why are my windows fogging up in my 2009 trailblazer

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Possible bad heater core. If you have a sweet smell in the vehicle, or if the carpet is damp/wet under the dash by the heater vent; you have a bad heater core that needs to be replaced. Bad or cracked window seals will cause the same problem. Check to see that you have enough air blowing from your heater vent also. Could be plugged between heater core and a/c condensor. More than likely it is your heater core.

Posted on Jan 16, 2013

  • tlready
    tlready Jan 16, 2013

    carpets is not wet and i have defrost high as soon as i turn it down windows start to fog up

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Depending on the air temp and humidity, you may be running the HVAC on recirculate when it should be on fresh.
You need fresh outside air so the ac compressor can dry it before it hits the windshield.

Posted on Jan 16, 2013

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