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Old 05-30-2003, 10:35 AM
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Join Date: Feb 2001
Location: Charlotte nc
Posts: 41
#8 fuse on 123 is hot

I am told that the compressor clutch may be pulling too many amps. The #8 fuse is too hot to touch and has melted the plastic a bit behind the feed side of #8 on the fuse box. The fuse seems to be cool enough when the compressor is not engaged. Should the fuse get hot to touch like that? Why does the fuse (16a) not pop?

All of this follows an evaporator replacement. I don't wish that job on anyone. Check out my firewall.

Thanks guys, I do not hold too much faith in this mechanic and would like a second opinion before I have the freon pulled out again.

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Old 08-04-2003, 02:39 PM
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Join Date: Jan 2002
Location: New Jersey
Posts: 4,251

Same issue here... I posted over a week ago regarding my situation where my cabin filled with smoke before the fuse popped... I was away for the last week, and so sent it to my locak independent, and he found that it was the compressor clutch is siezing up, and it causes the #8 fuse to heat up quick.

The plan of attackj from here is to get a new rebuilt compressor and clutch, and then put in a r134a retrofit with new receiver/dryer to try and get the max performance out of the retrofitted system.

Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)
1996 Dodge Ram CTD (438k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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Old 08-04-2003, 10:37 PM
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Join Date: Aug 2002
Location: NE Okla
Posts: 1,104
If the fuses or contacts are a bit corroded, the heat generation can be between the two pieces instead of in the metal of the fuse element. If things are clean the over-amp condition should cause the fuse link to blow.
1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
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Old 08-09-2003, 02:00 PM
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Join Date: Jul 2002
Posts: 1,141

I'd highly suggest with an R-4 compressor buying new and not a rebuild if you are keeping the car. New ones are only $200 at Autozone, rebuilt ones are $79 at Pep Boys. I'd only go new with an R-4.

Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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Old 08-10-2003, 01:25 AM
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Join Date: Apr 2000
Posts: 166
According to a number of posts on one of the automotive air conditioning forums, the W123's do not take to conversion to R134a very well.

Some of the knowledgeable air conditioning technicians have given up trying to extract satisfactory cooling from them with R-134a and converted back to R-12 for which they were designed.

1979 240D
165,000 miles
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