Fuse Popping on AC Clutch
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HT4100 4.1, 4.5, 4.9 Discussion, Fuse Popping on AC Clutch in Cadillac Engine Technical Discussion; 1993 Eldorado w/ the 4.9L engine. Haven't used the AC in 2 years since it had started popping the AC ...
  1. #1
    kdcing is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldorado, 4.9L, 200k miles
    Join Date
    Dec 2006
    Posts
    273

    Fuse Popping on AC Clutch

    1993 Eldorado w/ the 4.9L engine. Haven't used the AC in 2 years since it had started popping the
    AC fuse after turning the AC on. I think I know where to head and that is to the AC clutch power line
    to see if the AC Clutch is shorted out, or if the wiring harness to the AC clutch is shorted out.

    2 questions for the group:

    1. Where is the wire to the AC Clutch? I can see a wire coming off the compressor near the lower
    radiator hose. If I am standing on the passenger side of the engine and looking @ the compressor,
    the wire is at the 1 or 2 o'clock position relative to the AC Clutch/Compressor pulley. Is this wire I need
    to get at?

    2. If the wire in #1 above is the correct one, how do I get at it? There is so much stuff stuffed in the area
    around the compressor that I found it impossible to get at the wire. Has anyone gone into this area
    and have any tips to get my sausage fingers in there?

    By the way, if I am missing any other possible causes of the fuse popping, please let me know. Thanks.

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  3. #2
    kdcing is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldorado, 4.9L, 200k miles
    Join Date
    Dec 2006
    Posts
    273
    Thread Starter

    Re: Fuse Popping on AC Clutch

    After some additional research on the web, it appears that there is a
    diode in parallel with the AC Compressor Clutch. A bad diode will cause
    the fuse to pop.

    Has anyone replaced the diode? Is the diode a Radio Shack item or
    where can it be purchased? Also, what is the best way to get at the
    AC Clutch's diode in the cramped area around the AC Compressor?

  4. #3
    Leeb's Avatar
    Leeb is offline Cadillac Owners Enthusiast
    Automobile(s): did this once... 86 Deville, 86 300E, 78 R100rs
    Join Date
    Jun 2005
    Location
    Palm Spgs CA
    Age
    54
    Posts
    517

    Re: Fuse Popping on AC Clutch

    Take a look at this post...

    http://www.cadillacforums.com/forums...=ac+fuse+blown

    It might provide some insight...
    Simply put, get under there and disconnect the compressor from the wiring and replace the fuse. If it blows, you probably have a bad diode there if it has one.... sometimes they don't....
    If it doesn't it probably has a bad clutch coil (which was my problem). Lucky for me I had a 'spare' to use...


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