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My A/C for a 1998 Pontiac Bonneville will not come out of the vents inside the car. My A/C had been pulled down and freon has been added, the compressor comes on. I have the same problem with the heat it will not come out of the vents inside the car.

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  • dllb001 Mar 09, 2009

    1998 Pontiac Bonnville. My A/C will not blow out of the vents I have the same problem with the heat. I was told by a shop that the A/C unit is working fine and my blower is working fine, and the fuses have been checked.

  • dllb001 Mar 09, 2009

    1998 Pontiac Bonneville. The A/C will not blow out of the vents inside the car the A/C has been chagred and the fuses are fine, the blower works fine I was told at a shop that the A/C itself is working fine. I also have the same problem with the heat.

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9 Answers

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Either the heater control switch or the mode valve is faulty or the mode control valve is bad.

Check the link below for more details.

The air conditioning does not blow out the vents but through

Posted on Mar 16, 2009

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Try removing the blower motor and blow out any debris that may have been caught in the airway...leaves and other buildup over time will decrease or completely stop the airflow.

Posted on Mar 09, 2009

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Check all of your vacuum lines from the ac control panel and under your hood. You have lost vacuum somewhere witch controls your vents. There is one of them loose, disconnected or broken. Should be easy to trace. Good Luck!! 

Posted on Mar 09, 2009

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Hi, replacing the blower motor will fix this issue. Just to be safe, check the fuse box to see if the fuse is blown before purchasing a new fan motor. i suspect a blower motor failure.

Posted on Mar 09, 2009

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Hi!

Check for voltage at the blower motor on all settings. If no voltage, check the blower motor resistor or relay. If it has a resistor it will be right beside the blower motor, if it has a relay it will be the relay on the firewall under the hood. It will probably have a purple, orange,blue,and black wires.Please check any loose connection

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Rylee

Posted on Mar 09, 2009

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  • Shadow1989 Mar 09, 2009

    Actually, after re-reading your post, I answered assuming that you have heat or air coming out of defrost and floor.  Does your blower motor work?

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Nothing is coming out of the vents? Can you hear the blower motor working? or is it blowing? Does it sound like its blowing stronger when you turn it up? It is most likely either vacuum lines or the temperature selector itself.
Thanks,
Lee

Posted on Mar 09, 2009

  • Lee A.
    Lee A. Mar 09, 2009

    Once I have more information I can assist you further. Also please take a moment to accept and rate my solution accordingly.
    Thank you,
    Lee


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The vent which is controlled by vacuum is not working.... listen for a vacuum leak under the dash... also you will see a small vacuum cannistor near the firewall in the engine compartment... give that a few taps to free it up tho it may need replacing

Posted on Mar 09, 2009

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Does the blower blow any air out of the vents? If not you may have a blown fuse, check your manual to see which fuse powers the blower, if not blown then you may need to replace the relay or the blower itself.

Posted on Mar 09, 2009

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