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Old 06-11-2005, 12:29 AM
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Join Date: Jun 2005
Location: Sacramento, CA
Posts: 1
Blower will not turn on

Hello Everybody,
I'm a first time MB owner since yesterday(1983 300 SD Turbo Diesel). I can not get the blower to turn on. I removed the blower and connected it directly to a battery and it would operate. I then checked the voltage from the plug without the blower connected and I had current. I then reinstalled the blower and connections to retest and found no current at all. I donít believe I have a bad blower, but once it is fully connected there is no current. Could it be the pushbutton control panel? O' I also checked the fuses and they were good.

Thanks

JPete

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Old 06-13-2005, 01:00 AM
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smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,843
Some of these cars were retrofitted with 2 15 amp fuses outside the main fuse box. I don't remember if those fuses are for the ACC system or just the blower.

Was there axial play in the blower motor? If so it could have worn bearing causing the brushes to slide off the contact areas. It'll work if you test it with the shaft horizontal but not if it's installed with the shaft vertical.

Does the blower come on if you kick the bottom of the blower housing?

Does the blower come on if you set the switches to defrost and max blower?

Does the compressor engage in defrost?

Sixto
95 S420
87 300SDL

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