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#1
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Melting fuses again
This summer when I got my A/C going, my aux. fan fuse kept melting. It was not "blowing the fuse", but rather melting the plastic that supports the metal fuse. At the advice of the forum I pulled all the fuses cleaned all the contacts and applied dilectric paste to all the fuse tips. Problem solved.
Today my wife comes home and says that the A/C is not working and it is dead? So, I pop open the fuse box to find that the fuse for the A/C compressor and the blower fan is melted. The fuse is not blown but the plastic is melted (different fuse, but same problem as before). So, I cleaned the contacts again, applied the paste and put it back together. Everything works as before, but that one 25A fuse (#8) gets damn hot. With the car running and the A/C running, fuse #8 gets warm with the fan on low, hot with the fan in Auto. and damn hot with the fan on high. I reached over and felt the blower resistor and it was cool to the touch. Not even warm. Plus the fan runs strong and makes no weird noises. But there is obviously some resistance somewhere? Any ideas? I need to know where to get those ceramic fuses too...
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AJ 1985 300D (SOLD) |
#2
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MB has a workaround for this. It is well known, and they relocate the fuse outside of the fuse box, on the front fender. I think then with a heavier wire, they apply a strip fuse of higher rating.
I had a nice smoke event once when I busted my fuse due to the blower...
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
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It might be time for a new blower motor or cleaning/lubing the old current hog.
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#4
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Quote:
That is interesting about relocating the fuse. I would like to know more about that, as I do have a 126 aux. fan as well (much larger than the 123 fan). Maybe I should relocate both of those fuses? I just hate to mess with the original wiring harness.
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AJ 1985 300D (SOLD) |
#5
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I think it screws into the leads from inside the fusebox, just bypassing that fuse and its old plastic holder.
Doesnt seem like much of a job or that much of a bypass, but solves the problem where it exists... I think you can find info on it through the search. IIRC, there is even a DIY somewhere.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
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Quote:
Quote:
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AJ 1985 300D (SOLD) |
#8
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i have had cheapo plastic fuses melt before to, in fact many members have. Replace the plastic fuses for ceramic ones from the dealer.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#9
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Just install this device and your problem is solved:
http://www.performanceproducts4benz.com/product.asp?pf_id=P54-280&dept_id=5632 The p/n is: 54-280. |
#10
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yep, that's the one.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
#11
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part number 126 540 30 13 http://catalog.peachparts.com/item.wws?sku=W0133-1619012&itempk=85830&mfr=OES%20Genuine&weight=0.10 BTW - IMHO, I would not install this 30 amp fuse link on a pre-'85 w123 with a blower that requires a 16 amp fuse. Fires can possibly happen. .
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1983 123.133 California - GreaseCar Veg System |
#12
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Thanks for that link. The last time I called Phil and asked about this product, he stated that Fastlane has nothing like it. Therefore, I have been recommending the PP equivalent since that conversation (about two years ago). |
#13
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Quote:
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AJ 1985 300D (SOLD) |
#14
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Quote:
.
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1983 123.133 California - GreaseCar Veg System |
#15
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Blower Circuit Wiring (Wire Size,AWG or Metric)
Other than the Pre-Disposable Environmentally Friendly Self-Degrading Wiring
Harnesses Mercedes required of their supplier in the middle '90s...Most wiring is of good quality...BUT...of too small a gauge for the load (Amperage). The Blower Fan Circuit Wiring is especially Plagued with this problem. (Too Small a Wire Gauge RAISES the inherent RESISTANCE in the Circuit!) The "Outside the Fuse Box" 30 Amp Aluminum Fuse is a "Work Around". As the Blower Fan ages it requires more and more Power to do it's job. (Lack of Bearing Surface Lube,Bruch wear,Etc.,Etc.) What may have well been acceptable Wire sizing with a Fresh New Blower is often overcome later by the above. 'Fuses? these are what you want.
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'84 300SD sold 124.128 Last edited by compress ignite; 12-01-2009 at 08:28 PM. |
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