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#1
08-19-2009, 11:54 AM
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Symptoms of a bad blower regulator on a W210?
My fan will occasionaly slow down and stop on its own. If I turn the fan off for several minutes it usually comes back on when restarted. The AC system works fine as cold air trickles out the vents when the fan is acting up. Is this the dreaded bad blower regulator problem? I have seen threads on how to fix it I just am not sure of the symptoms. TIA
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 Muleears '07 E320 Bluetec 133K my DD '04 Jaguar XJ8 VDP, 34K '10 Hyundai Accent 60K Grocery Getter '02 VW Golf soon to be on the road again '97 E300 Diesel Son's DD '61 VERY tolerant wife Hampton Roads, VA USA Gone but not forgotten: '67 250S 95K '86 300SDL '87 300D Turbo, 364K! R.I.P. '98 E300 Turbodiesel, 213K '02 S420, 164K '01 Prius 138K 
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#2
08-19-2009, 12:06 PM
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The most typical symptom of a bad regulator is the inability to get higher blower speeds. If the blower stops completely it could be the blower itself or the regulator which is bad. Sometimes a bad blower can be restarted with a firm whack as it re-seats the brushes. You can determine if it is the blower or regulator by monitoring the voltage to the blower when it is acting up. If it is putting out power and the motor isn't turning then you know it is the motor and not the regulator.
FWIW, several other motors in cars with around 200K miles seem to have failed recently...that might be about the average life.
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz 
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#3
08-19-2009, 12:08 PM
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Thanks Marty. Is that voltage one of those that I can monitor with the onboard system?
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Muleears '07 E320 Bluetec 133K my DD '04 Jaguar XJ8 VDP, 34K '10 Hyundai Accent 60K Grocery Getter '02 VW Golf soon to be on the road again '97 E300 Diesel Son's DD '61 VERY tolerant wife Hampton Roads, VA USA Gone but not forgotten: '67 250S 95K '86 300SDL '87 300D Turbo, 364K! R.I.P. '98 E300 Turbodiesel, 213K '02 S420, 164K '01 Prius 138K
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#4
08-19-2009, 12:22 PM
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Its screen 10 IIRC.
Mine (blower motor) acted up as Marty outlined. I could usually fire it up buy reaching under (with panels removed) and giving the squirrel cage fan a quick nudge clockwise. Brushes go out.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#5
05-19-2011, 10:53 AM
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Quote:
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83 300TD (need rear wiper assembly dead or alive) 84 300SD Daily driver 85 300TD almost 400k miles and driven daily. 98 E300D *sold 86 300SDL *sold and made flawless 10 hour journey to new home. 
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#6
05-19-2011, 11:21 AM
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You can monitor the blower motor voltage using teh CCU while driving around. Press and hold REST for 5 secs. Use L/R AUTO buttons to toggle to the various screens.
If your blower isn't blowing, but regulator voltage is rising when set to auto, you've got bad brushes more than likely.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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