Question about 1996 Chevrolet Blazer

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Heater control 98 chevy s10 blazer

I have no heat going 2 floor? blower works i do have heat going 2 vents & defrost. when i switch the control knob from vents 2 floor it blows out of the defrosters does not go 2 floor at all even in the floor&defrost position. thank u

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  • Anonymous Mar 14, 2014

    1and 2 position not working

  • Anonymous Mar 23, 2014

    Chevy c2500 only blows out defrost vents

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2 Answers

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These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

  • mikehumble Dec 15, 2008

    What did you find as your problem or was this not it?

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  • 160 Answers

Something forein has fallen in to the heater vent selector open the blower box and find out what it is mostlikly a penny or pen

Posted on Dec 13, 2008

  • Stuart Taylor
    Stuart Taylor Jan 21, 2014

    where is the blower box located

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The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


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The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

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If you have warm air coming through the defroster vents then your core is not gone. there is something blocking or bent on the heater box mechanism which directs the air flow up or down, or on the climate control knob which controls it, or in the cable which connect the two.

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i would say its in the dash unfortunately you will have to pull it out to inspect.

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