a/c comes on for 4 secs than stops blowing!
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, a/c comes on for 4 secs than stops blowing! in Past Cadillac Vehicle Discussion; Hi. I have a 03' Deville. When i turn on the a/c, it blows for 4 secs than stops. At ...
  1. #1
    steed_1 is offline Cadillac Owners Member
    Automobile(s): 03' Deville
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    a/c comes on for 4 secs than stops blowing!

    Hi. I have a 03' Deville. When i turn on the a/c, it blows for 4 secs than stops. At first, it would kick in after a little driving. But now it doesn't. Also, when i turn it on, it makes a knocking noise in the area by my right leg.

    Can anyone help??

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: a/c comes on for 4 secs than stops blowing!

    Sounds like A/C shop work.......The short run cycle could be due to low refrigerant charge, but the knocking in the console sounds like either moisture in the system or a bad expansion valve at the evaporator (in-car coil).

    Have you read up ^^^^ (at the top of the main forum pages) on "how to pull codes" and "got codes? look here" ?? You may find something already in your car's built-in code system.

  4. #3
    Obersturmführer is offline Cadillac Owners Member
    Automobile(s): 2002 DeVille
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    Re: a/c comes on for 4 secs than stops blowing!

    I've had somewhat similar problem minus the knocking sound... Could be blower.. Some technician told me to knock lightly on the area underneath the glove compartment, which should in turn make the blower begin to work (why, I dont know).. he says if this is the case then its definately the blower motor, and when it's not operating (blowing air) AC should always be turned OFF or else could cause more damage to other cooling components, such as the compressor.

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