air blows fine with A/C on but not when it is off
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Thread: air blows fine with A/C on but not when it is off

  1. #1
    Greenhorn
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    Aug 2011
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    air blows fine with A/C on but not when it is off

    This just seemed to start ....noticed today that when the A/C is off, barely any air blows thru the vents. But, if the A/C is on it blows fine.

    I did check the cabin air filter and it's not that for sure.

    The A/C runs well (gets cold). I had that worked on earlier in the Spring (new compressor). Everything was fine (A/C or or A/C off) until just recently.

    Any suggestions would be appreciated.

    thanks!

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  3. #2
    Platinum Member Teeps's Avatar
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    The A/C on/off control (button) should not affect blower speed function or air delivery position.

    What year?
    Model?
    Trim level?
    Does the blower motor run at all speeds with A/C off?
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  4. #3
    Greenhorn
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    2012 Honda Civic EX

    The blower motor runs with AC off...and you can here it get louder as you move it up....but very little air comes out of the left most vent (by your left hand) and virtually zero from the vent by your right hand. Changing the controls from face, to legs etc doesn't seem to make much if any difference.

    Then...if I turn the A/C after a second or so, cold air starts cranking out the vents like I'd expect. Turn the A/C off, then the air flow dies again.

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  6. #4
    Platinum Member Teeps's Avatar
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    Quote Originally Posted by capmarvel View Post
    2012 Honda Civic EX

    The blower motor runs with AC off...and you can here it get louder as you move it up....but very little air comes out of the left most vent (by your left hand) and virtually zero from the vent by your right hand. Changing the controls from face, to legs etc doesn't seem to make much if any difference.

    Then...if I turn the A/C after a second or so, cold air starts cranking out the vents like I'd expect. Turn the A/C off, then the air flow dies again.
    At first your description sounds like the evaporator is freezing, except you say the A/C is off when the air volume stops...
    How about the passenger side vents, same as driver?
    Does the air temperature that comes out of the vents change?
    I wonder could the air be blowing out of the defrost vent along the bottom of the front windshield?

    Does your car have any aftermarket accessories or electrical modifications?
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  7. #5
    Greenhorn
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    Passenger vents do same thing. If I change the temperature dial, the temperature does change (so car gets "warm" when it's in the red head zone - just little to no warm air coming out of the driver or passenger vents). No aftermarket anything.

    And ...based on your suggestion...the air is coming out the side defrost vents by the mirror and the front defrost vent...and doesn't change no matter what button I hit (again, unless A/C is on)

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