'83 240D.....The fuse that is connected to the blower/fan motor keeps blowing. I'll replace it, turn the heat on, fan motor operates fine for about 2 minutes, then the fuse blows again. Do you guys think it is a bad fan motor even though the motor seems to run fine? Does that particular fuse supply anything else or is it just for the fan motor?

I'm an electrical idiot and don't own any testers. Wouldn't know how to use them if I had one!

Thanks and happy holidays to everyone.

Cheers,

Bill

You must have a short circuit causing it to blow. another circuit has attached on to that one causing to much current flow. The fuse you have blows because the amount of current is to high. Unless you know how to track down short circuits which I don't think you do, take it to an automotive electrician.

Just a question..... Are you using the right amperage fuse?
White= 8 amps
Red= 16 amps
Blue=25 amps

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.

Isn't there a commen problem with #8 fuse that requires a "beefed up" fuse, but I thought it was only a problem when the AC was on, which shouldn't be an issue this time of year.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

I believe so. A white one came out which is what I put back in. The old fuse I took out was in there for 2 years since I've owned the car.

Anyone know if that is indeed the correct amp fuse?

Thanks.

Cheers,

Bill

You might have a similar problem to what I had when I bought my car. I was told that you cant run the fan higher than the second speed because it would blow the fuse. I replaced the entire fan control switch, the center one between the two heater knobs and the problem vanished. So it might be your fan switch rather than the blower motor itself.

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

Yea Peter. I was thinking the switch may be a possibility since the fan motor doesn't make any weird noises and seems to run at the correct RPM. Maybe I'll try putting my last white fuse in then run on #2 speed. If it doesn't blow then the switch is the culprit.

Thanks.

Cheers,

Bill

does it blow after you floor the gas pedal? My kick down switch circuit had a short at the transmission and it drove the climate control nuts till I found it. two fuses run the system on the '83s #8 and #14 I think. Cechk the current draw thru the fuse at all speeds and if ok, crawl under the car and have a look at the wire going to the kickdown solenoid on back of transmission. of course if you have a stick shift, just ignore me

This happens to me, only its when i use the sunroof. I haven't used it for a prolly two years because of it. Wish i had a hand cranked sunroof

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1985 CA 300D Turbo , 213K mi

First
The Service Manual calls for a 16 amp fuse (red) in spot #8.

If the fuse continues to blow then it could be a couple of things. Motor brushes can cause the blown fuse as they wear. It could also be the switch as was posted.

So start with the correct fuse first.

Consider changing all your fuses with the correct fuse and using the copper contact fuses is better.
Here are the correct fuses for your car. 1983 240D

#1-8amp
#2-8amp
#3-8amp
#4-8amp (16 with heated seats)
#5 Not used
#6-16amp
#7-8amp
#8-8amp
#9-8amp
#10-16amp(25 with heated seats)
#11-16amp
#12-8amp
#13-8amp
#14-8amps
a-16amp
b-16amp
c-16amp
d-16amp

Radio inline fuse 2 amp

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Dave,
You said that #8 [fan motor circuit] requires a 16 amp [red] fuse but your chart says a white [8] amp is what belongs in the #8 spot. Which is it?

It had a white fuse in that spot for the 2 years since I've owned it and things worked fine until recently. Would the fan motor run at the proper rpm with worn brushes? It sounds fine and runs at the right RPM.

Bobk......I've got the 4 speed so no kick down switch. Just for the record no sunroof either. I think the only thing on that fuse is the fan motor. Thats all that quits working when it blows.

Cheers,

Bill

I also beleive the #8 fuse requires a 8 amp white fuse. someone before mentioned a mod to cure the common problem of a fuse blowing. which fuse is it for and Can I get it from Phil?

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1984 300d 360,000mi(sold, I miss it!)
1984 300D
1973 450se
1995 E300
2006 E350 4matic
2016 E250

Bill do you still have the TD? swap out blower motors and see if it still blows with that one in its place.

You could also check current draw of the blower motor by hooking a meter inline and reading what it draws on each fan speed setting, but of course, you'd need a meter capable of that first.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350