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Old 09-06-2010, 07:56 PM
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Join Date: Jul 2010
Location: Austin, TX
Posts: 13
Repeatedly Blowing No. 8 Fuse

1985 Mercedes 300 CD

Not sure if this Post should go here in Diesel, or elsewhere in Tech?

After working well all summer, today my AC began blowing hot air. I checked the fusebox legend and it said the Blower Motor and AC Compressor is No. 8 fuse (By the way, the Blower Motor continues to blow (hot) air just fine)

I checked to find No. 8 fuse (blue, 25 Amp) discolored, so I replaced it with a new fuse. In short order, that fuse blew as well.

I know to check to wires to the clutch on the AC compressor. I guess it could be a faulty, shorting, button in the Climate Control module?

Any other suggestions of places to look would be greatly appreciated

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Old 09-06-2010, 08:13 PM
zeke's Avatar
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Join Date: Sep 2007
Location: The Alamo City, TEXAS
Posts: 1,189
Could be a problem at the blower or the aux fan, but mine turned out to be rotten wires at the the terminal strip right behind the overflow coolant tank.

Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT
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Old 09-06-2010, 10:40 PM
toomany MBZ's Avatar
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Join Date: Nov 2006
Location: central Va
Posts: 7,820
If the brushes on the motor are very short, they'll draw more amperage just to work normally, thereby blowing fuses.
Good luck and let us know what you do.
83 SD

84 CD
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Old 09-07-2010, 06:33 PM
Yak Yak is offline
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Join Date: Aug 2009
Location: San Antonio, TX
Posts: 1,711
Do you have a matchbox sized box on your driver's side strut tower, aka an "aux fuse?"

If your blower motor still works with a blown fuse then it's possible you have the replacement fuse and don't need the number 8 fuse. It's a mod made on many cars. I don't have a number 8 and my A/C works.

You'd still need to figure out the cause - maybe the compressor, maybe the blower motor, maybe the wiring.

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