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AC blows thru feet vents

Discussion in 'Heating and Air Conditioning' started by Jan, Apr 24, 2014.

  1. Jan

    Jan New Member

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    I have an 04 Expy and when I accelerate, the AC will start blowing thru the heater vents at the feet. I checked today and this does not affect the overhead rear vents, only the ones in the dash. When I stop acceleration, the air comes thru the vents like normal. Any thoughts on this?
  2. Poppy

    Poppy Well-Known Member Respected Member

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    vacuum leak
  3. Action

    Action Moderator Staff Member Respected Member

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    Second the above reply.

    There is not enough vacuum supply because of a leak some where. There should be a vacuum can with a one way check value to hold the supply during conditions of low vacuum from the engine. There is low to no vacuum upon acceleration from the engine.

    Fix the leak and the side benefit will be better fuel economy, possible lower idle speed and the engine may operate smoother.

    >>>>>>>>>>>>>>Action
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  4. KawiG5

    KawiG5 New Member

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    Am having the same issue with my '03 Windstar. Just hope I can locate the leak. Does anyone know if there's a common location for these vacuum leaks to develop?
  5. Action

    Action Moderator Staff Member Respected Member

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    It is more of a hunt and peck locations. Unless some one has kicked under the instrument panel, it is more likely an under hood vacuum leak. The conditions are much more harsh under the hood. A broken or cracked line is a common cause. After that would be a leaking vacuum motor.

    A good vacuum gauge or vacuum tester would be very helpful tool.

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  6. KawiG5

    KawiG5 New Member

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    Thank you very much. this also probably the cause of the high idle that happens every once in a while. Just hope finding and fixing the leak cures all.
  7. Action

    Action Moderator Staff Member Respected Member

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    KawiG5 likes this.
  8. Action

    Action Moderator Staff Member Respected Member

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    "Thank you very much. this also probably the cause of the high idle that happens every once in a while"

    Very likely. A vacuum leak will cause the idle speed to increase. Should throw off the engine controls as well. The engine controls will want to richen the fuel mixture because of the lean condition cause by a vacuum leak.

    >>>>>Action
  9. KawiG5

    KawiG5 New Member

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    I believe that is also the case too. You can smell a richness in the exhaust. I don't know if this is related but sometimes after the engine has been off for about 10 mins. the engine runs bad when restarted (like being flooded) and I have to press the accelerator to clear it up.
  10. Action

    Action Moderator Staff Member Respected Member

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    ^^^^ Could be..

    Is the check engine light on??

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  11. KawiG5

    KawiG5 New Member

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    Only happens after a few restarts of running crappy but not typically. Goes back out after about 3 good restarts.

    This is obviously for another thread. Don't want to hijack this thread.

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