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Old 06-06-2000, 08:21 AM
Registered User
Join Date: Feb 2000
Location: Columbus Ohio
Posts: 709
I have noticed that on my W140(300SD) two things about the AC..1)it does not seem to blow at a high max speed.....2)When accelerating with the AC I sometimes hear a whistling sound coming from the ducts...the air blows very cold and does not change volume when the whistling occurs...buts its an annoying sound.My 1992 300D 2.5(124) never had this whistling problem and also blew at a higher max fan speed. Took it to the dealer once for this at the last oil change and they said it didn't seem to be blowing quite fast enough but didn't really see any problem...any ideas?
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Old 06-06-2000, 12:20 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
Your blower problem is the blower resistor #140-821-83-51 almost every 140 have this problem.

MB STARS Master Guild Technician,12 years MB tech
6 years independent shop owner
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Old 06-06-2000, 09:58 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
You can order this from us and do the job in under an hour...I have heard of the dealer charging upwards of 4. Be carefull.

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
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Old 06-07-2000, 06:16 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The whistling noise is probably from vacuum leak, should not be there at any time. Take car back & have them RIDE with you when problem happens.
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