Question about 1994 Chevrolet S-10 Blazer

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Smoke coming out of vent when defoster is on

I have a 99 chevy blazer when i put the defoster on smoke comes out of vents

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  • luckiechris Feb 02, 2009

    its was smoke and I think it smeels like any freeze

  • Roberta Smith
    Roberta Smith May 11, 2010

    that would be mist then.... your heater core is likely leaking and will need to be replaced.

  • Roberta Smith
    Roberta Smith May 11, 2010

    smoke or mist ... what does it smell like ?


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I believe the problem you have is a leaking heatercore, I have not done one on a Blazer- Jimmy but will get to do it soon to mine ( 1998 Jimmy )it looks to me as though you have to access this from under the dash and inside the truck. If your more of a large type, like me, you might want to concider having your local mechanic do it as working under the dash and upsidedown could be a little uncomfortable. Hope this helps. Cornbread.

Posted on Feb 03, 2009

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