99 Deville, mice in the heat vents...
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 99 Deville, mice in the heat vents... in Past Cadillac Vehicle Discussion; This car is quite the project... 70,000 miles, rust free Ontario car, Galaxy silver (?), engine is back in and ...
  1. #1
    ponyboyt is offline Cadillac Owners Enthusiast
    Automobile(s): 97, 97, RIP 98, 99 STS with Jakes studs
    Join Date
    Apr 2009
    Location
    Ontario, Canada
    Age
    38
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    704

    99 Deville, mice in the heat vents...

    This car is quite the project... 70,000 miles, rust free Ontario car, Galaxy silver (?), engine is back in and runs beautiful! (studs)

    I had no idea what other work it was going to need... pretty much replaced everything underneath. I've done a few STS's with much higher miles that did not need nearly this much work.

    Anyhow, i have a heating issue. Ive tested as many different ways to blow air as i can think of to try and narrow it down. Ive looked at the diagrams, but i dont know what door is for what, so here goes:

    Heat on max, air comes out the bottom but it is very weak. Can hardly feel any hot air blowing. If i turn it down far enough to make it switch to the upper vents, and i leave the passenger side to hot, it blows hot air out the two passenger vents and cold air out the 2 drivers side vents, air blows hard out all 4 vents. Set to defrost, again it is weak, hardly any air comes out of the dash vent, and not very hot.

    I have history codes, but dont know which are relevant? Im assuming they will be the ACM codes. I do hear clicking when the doors try to move. Not a steady click click clik click, but a click, a 2 second pause, 2 clicks, 1 second pause, a click, and so on, kind of random.

    Oh and the first time i turned it on, the dash vents blew hard and it blue little peices of dark foam all over the place...all over the seats. made me think of a mouse nest :P

    I dont have any Deville parts laying around, but i have a pair of 97 sevilles that all this stuff works in both cars. Would the parts be the same?

    Also, drivers seat heater does not work. First the relay wasnt clicking, i changed it and now it clicks, but still no heat. Passenger is fine.

    Will post codes soon as wife gets back from dropping the kids off

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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
    Join Date
    Feb 2004
    Location
    Minnesota
    Age
    63
    Posts
    9,824

    Re: 99 Deville, mice in the heat vents...

    sounds to me that the MODE DOOR actuator is stripped -

    that clicking sound is from the broken plastic gear teeth -

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