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#1
08-27-2013, 04:25 PM
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Sporadic A/C blower outage
I realize this isn't specifically a diesel issue, so maybe the moderator might move it appropriately. Or fine if it stays put here.
My E300D (1999) has an A/C blower motor that has occasionally decided to take a 1-2 day vacation. I'm not sure if it is tied to cooler or wetter weather, but it may be. In any event, the climate control fan will not be functional and then at times when I reach highway speed it will kick back on. Then it will be available for an extended period, like a week or two. Then back to misbehaving. The electronics appear to be OK, nothing amiss with the displays. Seems like a sensor or relay flaking out rather than just maybe the blower motor? Thanks, Chuck
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1982 300D, anthracite grey, 260k miles, Greasecar 1999 E300D, black, 160k miles, Greasecar 2010 Honda Insight Hybrid http://www.chuckwyatt.com http://www.wordimpressive.com 
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#2
08-27-2013, 04:34 PM
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Can you hear the flaps moving or any relays clicking? If so, it could be the brushes in the blower motor are worn out. I have had that happen to several blower motors in my 300SD.
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge Last edited by eatont9999; 08-27-2013 at 04:48 PM.
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#3
08-27-2013, 04:35 PM
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Thanks so much. Yes, I do hear some flaps moving if I switch things around to defrost or recirculate. Would love if it were a simple solution, but also realize I don't get to choose!
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1982 300D, anthracite grey, 260k miles, Greasecar 1999 E300D, black, 160k miles, Greasecar 2010 Honda Insight Hybrid http://www.chuckwyatt.com http://www.wordimpressive.com
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#4
08-27-2013, 04:37 PM
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Intermittent blower operation can be a sign that the blower's on its way out. That's how it was on my 92 300D at about the same mileage as your car.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#5
08-27-2013, 04:42 PM
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Quote:
 With my '82 300D, the blower was just behind a panel under the glove compartment... should I suppose this one is in as accessible a location, or no such luck? Thanks lots! Chuck
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1982 300D, anthracite grey, 260k miles, Greasecar 1999 E300D, black, 160k miles, Greasecar 2010 Honda Insight Hybrid http://www.chuckwyatt.com http://www.wordimpressive.com
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#6
08-27-2013, 08:06 PM
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I drove my 99 for a year with an intermittent blower motor and the two covers off the interior passenger side fan. I found that if I reached under and gave the squirrel cage fan a nudge to the left that it would engage and begin to spin. Usually. Occasionally, i'd hit a pot hole and it would start itself up.
Was bad brushes. They aren't replaceable without cracking a factory sealed fan motor. I replaced mine eventually and life was good again......
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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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