'94 Deville - insufficient airflow from vents

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, '94 Deville - insufficient airflow from vents in Past Cadillac Vehicle Discussion; I've had my '94 Sedan DeVille for about 6 years now...just under 195k on it. For as long as I ...
  1. #1
    Metalgod's Avatar
    Metalgod is offline Cadillac Owners Member
    Join Date
    Aug 2004

    '94 Deville - insufficient airflow from vents

    I've had my '94 Sedan DeVille for about 6 years now...just under 195k on it. For as long as I can remember, no heat ever came out of the air vents that are up around the steering column or would be blowing air on your upper body for lack of a better term. The car will warm up and I can hear the motor running and it sounds like air is blowing, but nothing comes out of the vents and barely anything comes out of the vents down by the feet (all of this is regardless of the setting whether it's from AUTO, auto-high, or high). With the heat, I'm aware that if you put it on auto, there is no airflow until the engine is sufficiently heated and that it does turn off once the set temperature is reached in the vehicle.

    Now onto the a/c. If I turn on the a/c, a very minimal amount of air flows from the upper vents (this is with the fan set to AUTO, auto-high, or just high), but the proper amount of air flows from the lower vents by the feet. Basically, I'd say there's about 3 to 4 times as much air flowing from the lower vents as the upper ones. The car will cool down in time, but it just takes longer due to the lack of airflow.

    I've always wondered about these things, but never really took the time to look into it. Any help would be appreciated and sorry for the length of this. My first guess would have been a blower motor, but that appears to be working fine so at this point I am completely confused.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: '94 Deville - insufficient airflow from vents

    Check the HVAC housing on the firewall where the blower motor is mounted. They tend to get brittle and crack over many years and heat cycles. If it is cracked all your air may be going into the engine bay.

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