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Old 02-24-2002, 01:31 PM
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Join Date: Mar 2001
Posts: 66
300e Blower Motor Diagnostic Help

My daughters 300e's blower motor has stopped working. A while ago she had a similar problem but fixed it by punching the selector buttons hard repeatedly.

Now it will not respond to similar teatment. Obviously I suspect the switch, but want to make sure its nothing else first.

I checked the fuses, including the one on top off the strut, all seems OK. I am getting about 6.5v on that fuse.

On the connector (engine side of bh) I get very small voltages and they do not change based on sw position.

Is there any other things I can test to prove the problem or is it time to take the switch out ?
1990 124, 300E 2.6 (daughter)
2004 Cayenne S, Fabspeed Cat Bypass, BMC Racing Filter
2000 Lexus RX 300 (Wife)
Retired 1999 ML430
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Old 02-24-2002, 03:13 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I would start with that 6.5v fuse. Pretty healthy drop for a 12v system.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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