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Registered
1985 300SD - 252,000 miles and counting
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23 Posts
Discussion Starter #1
The #10 fuse is blowing on my 1985 300SD. I have unplugged the CCU, monovalve, Temperature gauge, auxiliary water pump and the cabin temperature blower and it is still doing it. Any thoughts on what else might be causing it?
Thanks!
 

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Registered
1991 300 SE
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18,534 Posts
Was the A/C converted to r134a? Some MBs of this era experience an overload problem after the conversion.
 

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Registered
1985 300SD - 252,000 miles and counting
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23 Posts
Discussion Starter #3
Yes, it was converted by a previous owner. The fuse blows right after the ignition is turned on and the car isn't running.
 

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Registered
1985 300SD - 252,000 miles and counting
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23 Posts
Discussion Starter #4
Bump! I still haven't figured this out and it's getting too warm to not have working climate control!
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
Joined
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40,084 Posts
Help! Please!
Have you tried a search? If not sure how, please re visit the 'Welcome to the Forum' tutorial sticky on top of the W126 page.
I posted a list of available climate control pdf recently.
Cheers
 

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Registered
1985 300SD - 252,000 miles and counting
Joined
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23 Posts
Discussion Starter #7
Yes, I have searched using all manner of keywords for items on the #10 fuse but with no luck. I suspect it is something other than the CCU because I unplugged it and the fuse still blows.


Have you tried a search? If not sure how, please re visit the 'Welcome to the Forum' tutorial sticky on top of the W126 page.
I posted a list of available climate control pdf recently.
Cheers
 

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Registered
'86 E300 Diesel '82 300 SD '87 560 SEL
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432 Posts
Things going through fuse #10:
starter lockout/back-up light switch, rear lights, overload relief valve, intake manifold pressure switch, kickdown switch, kickdown solenoid, outside temperature gauge and sensor, electronic unit for temperature control, heater air temperature sensor, in-car temperature sensor, compressor kick-down cut-out control unit, compressor cut-out microswitch, auxiliary water pump, auxiliary fan relay, receiver-dryer switch.
Gooood luck!
 

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Registered
chevrolegs
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58 Posts
same problem here, but mine blows as soon as you start driving-was going to individually fuse everything that is powered off that circuit (no fun) but at a loss what else to do

did you find your problem (O.P.) or any further help? :crybaby2:
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
Joined
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40,084 Posts
Yes, I have searched using all manner of keywords for items on the #10 fuse but with no luck. I suspect it is something other than the CCU because I unplugged it and the fuse still blows.
# Troubleshooting
# Index of Electrical Circuits

Index of Electrical Circuits - Automatic Climate Control

The files are too big to post here. PM with email, and i'll try to attach.
 

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Registered
1984 300sd turbo
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46 Posts
To solve a problem like this you need an electrical diagram or schematic. Trace out everything that is on that fuse and unplug it. See if it blows when you turn on the key. If it does then it's a worn wire somewhere that is shorting to ground. If it doesn't then you plug thing back in one at a time and check to see if it blows after you plug it back in. It helps a lot if you have someone sitting in the car to turn the key while you plug things back in. And just to be on the safe side jack up the car so the drive wheels are off the ground. When your friend or child turns on the key your life is in their hands.
 
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