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  #1  
Old 05-14-2011, 11:02 AM
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Join Date: Aug 2006
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1987 300 sdl AC blower

My blower just stopped working on my 1987 300 sdl. I did a search and could not find how to troubleshoot. How do I check the blower without removing stuff not needed? Suggestions please

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  #2  
Old 05-14-2011, 11:24 AM
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One thing I noticed is faint amount amount of air coming out of vents when car is moving. Help please. Thanks
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  #3  
Old 05-14-2011, 01:11 PM
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I have been searching threads and still not found troubleshooting blower fan for this model. Help please. Can I run a ground wire to honeycomb resister and check motor?
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  #4  
Old 05-14-2011, 05:09 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Did you check all the fuses? Not just a visual inspection, remove each fuse and check that the metal strip is intact. Better still, replace all the fuses unless you know they've been replaced in the last 10 years. Does your car have a pillbox just outside the main fusebox? If so, check that the 30A strip fuse is intact.

If the fuses are good, set the ACC to defrost and give the panel under the glove box a good upwards thump. If the blower engages, the bearings are likely shot allowing the shaft to slide away from the brushes. You can replace the bearings if you know how to source and replace such things. Or get a new motor or blower assembly. More likely, the brushes are worn. You can replace the brushes if you know how to source and replace such things. Or get a new motor or blower assembly.

My W126 days are long ago but as I recall there are 3 screws along the forward edge of the carpet lined underdash panel just below the glove box hinge, and maybe a couple more in the black plastic panel that extends to the floor. No need to separate the carpeted panel from the plastic panel. The outboard kick panel might have to come off as well. There are 3 screws holding the bottom of the blower assembly to the airbox, then a couple of wires from the blower controller (porcupine) to the motor. This is as easy as it gets for MB blower motor replacement.

The problem could be a bad component between the ACC switch panel and blower but test the motor first.

There is airflow when the car is moving because the system is designed to ventilate the cabin. There shouldn't be airflow when the ACC is set to OFF (engine running) or recirculate.

Sixto
87 300D
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  #5  
Old 05-15-2011, 02:22 PM
luke4's Avatar
benz-o-matic '86
 
Join Date: Mar 2011
Location: North San Diego County, CA
Posts: 60
sixto is right

Quote:
Originally Posted by sixto View Post

My W126 days are long ago but as I recall there are 3 screws along the forward edge of the carpet lined underdash panel just below the glove box hinge, and maybe a couple more in the black plastic panel that extends to the floor. No need to separate the carpeted panel from the plastic panel. The outboard kick panel might have to come off as well. There are 3 screws holding the bottom of the blower assembly to the airbox, then a couple of wires from the blower controller (porcupine) to the motor. This is as easy as it gets for MB blower motor replacement.

---

There is airflow when the car is moving because the system is designed to ventilate the cabin. There shouldn't be airflow when the ACC is set to OFF (engine running) or recirculate.

Sixto
87 300D
Be careful with that lower outboard kick panel. Sixto is right, it must come out before you can get the under dash panel out. There are two clips that hold it in place. I managed to break one of the metal ones pulling mine apart. I'd suggesting using one of those interior panel clip pry tools to pop the clips loose.

With my fan motor, dumb luck had it that I accidentally bridged the positive lead to the spiral wire/spring thingy with the ignition turned on. The fan jumped to life and I discovered that the culprit was a small amount of corrosion between the wire plug receiving end and the aforementioned spiral wire (that leads to the brushes). I just cleaned it and dropped some hot solder in there and viola, works fine now!

Of course this may not be your problem, but it's easy to check and fix if it is. YMMV
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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]
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  #6  
Old 05-15-2011, 09:21 PM
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Thanks for the removal help. I removed it today and tried to get some machine oil to the bearings. It is working fine for now.

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