Question about 2004 Chevrolet TrailBlazer

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Front A/C Vents stopped working after I Changed the battery, Chev trailblazer

All the other vents work fine. Just the Front vents don't blow air. Worked fine, before I changed battery.

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  • aje1219 Oct 10, 2008

    The airflow is not switching when I hit the mode button. It's alway blowing down on my feet. Even when I have the mode switch to blow toward my head, it blows toward my feet. Hoses are connected.

  • aje1219 Oct 11, 2008

    How do I fix the directional Air Flow system. All the hoses are connected. Is it a mode Actuator I need to replace or is there a reset button I can hit.



    No matter what mode I put the A/C on it runs through the Floor vents. Not swithching with mode button.



    Is the Mode actuator behind the glove box?



    Thank you for your assistance.

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Have the vents checked. See if there's a leak or something block the air passage.

Posted on Oct 10, 2008

  • Janet Nery
    Janet Nery Oct 10, 2008

    Have the vents checked. See if there's a leak or something blocking the air passage.

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Usually it's because of a vacuum leak from a defective hose or a vacuum hose that is disconnected. Sometimes, if it has a vacuum canister, the canister is bad or the vaccum hose has fallen off or somebody forgot to reconnect the hose. Usually it is a very small hose that you will need to find, like 1/8 inch. This is caused by the vacuum from the engine intake manifold not getting into the cab. Check that vacuum line for soft spots, kinks or being disconnected. The vacuum is used to activate vacuum motors which open and close doors in the air ducts. The doors control the flow of the air to the correct vents. For instance, warm air is sent to the vents below the windshield to provide a defrost function. Cold air is often sent to the vents on the front of the dash for air conditioning. After a period of time, the diaphragms in the vaccum motors will begin to leak causing the vacuum motor not to work. But, first check for loose or leaking hoses and fittings or a defective vaccum switch

Posted on Oct 10, 2008

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Chances are a vacuum line that controls the direction of the airflow in the cabin was broken or knocked loose during the battery install.

Hope the tip helps

Posted on Oct 10, 2008

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First, check all your fuses, the dash may have it's own blower on a seperate fuse from the heating system..then, check down by the floor board , see if you notice any ducting disconnected from another piece of ducting. (this will cause you to lose air on a non-external blower system)
If that is ok, open the hood, look in the battery area for any wires NOT connected as one might have been bumped, dislodged or left unconnected when the battery was replaced.

Posted on Oct 10, 2008

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