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Old 10-01-2008, 09:31 AM
rusty_parts2001's Avatar
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Join Date: Aug 2005
Location: South Texas
Posts: 49
W 140 Air Conditioner -weak blowing, then quit

My 1995 Mercedes W 140 mercedes (S320) had been experiencing less than stellar air flow from the A/C, even on max air. I bought it new so I know what is was supposed to do, but the decline in air volume has been slowly deteriorating. It gradually got weaker and weaker although it was still cold. Yesterday, it quit blowing at all. Any ideas?

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Old 10-01-2008, 10:56 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Check the fuse link on the driver side strut tower.

If the air volume has decreased , but the fan speed has not, you want to change the cabin filters.

If the motor has decreased in speed, you want to check the brushs/bearings and regulator.

What have you checked??
A Dalton
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Old 10-01-2008, 11:49 AM
Join Date: Jan 2003
Location: Florida
Posts: 1,084
The links should help you understand, probably the regulator, if the motor spins by hand
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Old 10-01-2008, 12:35 PM
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Join Date: Oct 2005
Posts: 4,263
Early 210's use a very similar regulator (same electronics, different wiring harness) and this is a very common problem.

It usually first presents itself as a blower that works fine up to half-speed, then will blow no harder.

Apply full power to your fan motor by disconnecting the regulator and grounding the motor lead that went there. The other lead is battery voltage. If the motor runs at full speed, it is fine and the fault is almost certainly in your regulator.

There is a slight chance that the fault is in your pushbutton control module, but that chance is very, very slight.
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Old 10-01-2008, 01:27 PM
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Join Date: Sep 2004
Location: DFW / Collin County Texas
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Going through the PO's old receipts, the regulator on my W210 was replaced under warranty due to the same issue. New regulator fixed it.
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280
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Old 10-01-2008, 10:51 PM
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Join Date: Aug 2005
Location: South Texas
Posts: 49
That was an excellent DIY article at the link. At a minimum I can show it to a local tech. Small town mechanics around here tend to shy away from anything not a Ford or Chevy, so this is a big aid. At best I can tackle the job myself. Thanks.

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