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1993 Eldorado, 4.9L, 200k miles
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273 Posts
Discussion Starter #1
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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Registered
1993 Eldorado, 4.9L, 200k miles
Joined
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273 Posts
Discussion Starter #2
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?
 

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Registered
did this once... 86 Deville, 86 300E, 78 R100rs
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517 Posts
Take a look at this post...

http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/71848-would-cooler-w-ac-working.html?highlight=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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