2002 Deville - Heater/AC blower motor problems - Quick Fix
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2002 Deville - Heater/AC blower motor problems - Quick Fix in Past Cadillac Vehicle Discussion; This was a quick fix that I did to restore function to my blower motor. Just wanted to post this ...
  1. #1
    MinnesotaDeville is offline Cadillac Owners Member
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    Smile2002 Deville - Heater/AC blower motor problems - Quick Fix

    This was a quick fix that I did to restore function to my blower motor. Just wanted to post this because I noticed a lot of threads pleading for help but really no solutions. This is just one thing to check before ordering a new blower motor.

    Symptoms I was having
    - Blower motor not working, minute heat or no air blowing out the dash/defrosters/floor. ect...
    - Occasionally works turns on and off
    - Slamming the right hand side passenger door would temporarily fix the problem
    - Tapping on the blower motor metal housing with the handle of a screw driver would temporarily fix the problem
    - Wiggle the blower motor power source - Blower motor turns on and off
    - Wiggle the housing - Blower motor turns on and off

    Quick Fix - Take blower motor out from underneath the dash (passengers side - 3 screws). Took the metal housing off the bottom of the motor so you can see the brushes and the copper color metal that they come in contact with. I took a small file and filed the brushes slightly. Then I took the file and filed away the musty tarnished brass/copper or what ever the metal is. Got it nice and shiny again. The sub housing that holds the brushes, remove that from the main housing. You will need to pinch the brushes to retract the springs so you can get the sub housing back on the contact. Then put the main cover or housing 2 screws back on, plug the blower motor back in and she should start spinning. That was just my case and what I did to fix it. If you have some of the symptoms above you might want to try it. It will save you some $$$ about $250 from the stealership.. Ebay has new motors for about $50. This whole ordeal took me about 45 mins with a broken knee... Anyone is capable...

    Hope this helps as thats all I am trying to do, I know my parts terminology is not up to par... GOOD LUCK!!!

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Thanks for the post. I copied this to the Tech Tips forum and changed the title to read 2000-2005 Deville etc.

  4. #3
    polorico is offline Cadillac Owners Member
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    I hear a sound underneath my dash as well . I think its the blower motor , My heat runs hot then slows down....

    So i should do this trick to fix the problem ? great thread

  5. #4
    mike5514 is offline Cadillac Owners Enthusiast
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Thanks for the tip Im a strong believer in taking things apart (when possible) and try to repair before I buy new.Mike

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Quote Originally Posted by polorico View Post
    I hear a sound underneath my dash as well . I think its the blower motor , My heat runs hot then slows down....

    So i should do this trick to fix the problem ? great thread
    The fan speed is supposed to slow down as the cabin reaches it's requested temperature.

  7. #6
    00 Deville's Avatar
    00 Deville is offline Cadillac Owners Connoisseur
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Quote Originally Posted by MinnesotaDeville View Post
    Take blower motor out from underneath the dash (passengers side - 3 screws)... This whole ordeal took me about 45 mins with a broken knee... Anyone is capable...
    Nice fix... I see that you are one of the lucky 2002 Deville owners that has the design 2 blower assembly. What's the build date on your car?

    Design #1 ran from 2000-2002 and is a PIA to change... more than 3 screws and the assembly is too large to pull from under the dash... hence the design change.

    Design #2 ran from 2002-2005 and has a much smaller housing and simple to change (only 3 screws).

    The usual problem with the design #1 blowers is a broken wire (bare copper) that runs to one of the motors brushes.

    ----------

    Quote Originally Posted by Ranger View Post
    The fan speed is supposed to slow down as the cabin reaches it's requested temperature.
    Exactly... it does this by PWM (Pulse Width Modulation) you won't see a voltage decrease going to the motor on a meter as the motor slows down. You would see the spacing between the pulses of DC widening on an Oscilloscope in the unlikely chance that anyone on this board actually owned one.

    Now that I've said that I'll probably here from all the pencil necks that do own one.

    .

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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Not me. Ain't too many tools I don't have, but that is one of them. Wouldn't know how to use it anyway.

    BTW, I copied the upper portion of your post to the Tech Tips thread as well. I thought it was pretty relevant to anyone who reads it in the future.

  9. #8
    00 Deville's Avatar
    00 Deville is offline Cadillac Owners Connoisseur
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Quote Originally Posted by Ranger View Post
    BTW, I copied the upper portion of your post to the Tech Tips thread as well.
    I was wondering how that got over there... Nice work.

  10. #9
    saler11 is offline Cadillac Owners Member
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    I just fixed mine the easier generation with three bolts. All i need was sand paper and some wd-40. Great article for a great direction! Thanks

  11. #10
    Chuckly is offline Cadillac Owners Member
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    I'm having a similar problem on my '05 DeVille. How do you get the fan out?
    Thanks in advance!
    - Chuck

  12. #11
    Ranger's Avatar
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    Re: 2002 Cadillac Deville - Heater/AC blower motor problems - Quick Fix

    Just remove the passenger side lower insulator panel and it's right there. You could remove the knee bolster above it if you want more room, but remember, it pulls straight out NOT down.

  13. #12
    houg is offline Cadillac Owners Fanatic
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    Re: 2002 Deville - Heater/AC blower motor problems - Quick Fix

    does any one know were brushes can be bought??? i have a spare motor that just needs brushes but i cant find them any were

  14. #13
    Ranger's Avatar
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    Re: 2002 Deville - Heater/AC blower motor problems - Quick Fix

    I'd check a local starter/alternator rebuilder. Otherwise check online. Don't worry if they are oversized. They are as soft as chalk and are very easily filed to size.

  15. #14
    griff's Avatar
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    Re: 2002 Deville - Heater/AC blower motor problems - Quick Fix

    Dear Minnesota: Thanks so much for your technical advice. My 147 thousand mile 2005 DeVille AC fan quit just after a battery replacement job. I had thought that the battery job had something to do with it, but my troubleshooting led me to the carbon dust filled AC motor. Your article guided me to solving the AC fan problem and my hat's off to you. Griff

  16. #15
    Pitdog is offline Cadillac Owners Member
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    Re: 2002 Deville - Heater/AC blower motor problems - Quick Fix

    I'd also like to say thank you for your detailed post. I was able to easily fix this issue at no cost using your tip. The motor looked pristine outside and was a corrosion horrorshow inside, with rust chips and nasty sconge everywhere. I shop-vac'd all that out, ground the brushes to shape and reassembled in about an unhurried hour. The passenger door-slam is a great interim fix until you have time to service the motor correctly. My wife thought I was The Fonz when she said the blower wasn't working and I told her how to get it going, LOL.

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