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Old 07-27-2001, 02:32 PM
Registered User
Join Date: Jan 2001
Location: San Francisco
Posts: 26
Hi folks,

In my s420 1995, the MAX setting for the AC blower merely blows a negligible amount of air through the vents. My brother's C-class blows his hairpiece out of place at the MAX setting.

Are the blowers on the W140s designed not to blow hard? All vents check out ok and it blows cold air - it's just that it doesn't blow hard, so it takes a while before cooling the whole cabin. The rear vent also blows very slowly.

Is there an AC blower that I can replace mine with that blows harder?

thanks a mil.

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Old 07-27-2001, 03:28 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Remove the cover at the back of the engine comparment, pass side, in front of the windshield. There are about six big phillips screws holding it. The blower is underneath. On top of the blower is the regulator. It controls the current flow (speed) of the motor in response to the voltage signal sent by the pushbutton controller. This signal should be a 1 to 6 volt signal. They may go as high as eight volts but the one I tested last week wsa getting a little over 6v at max.

If your control voltage is right then the regulator is probably bad. (That is the very common answer to your problem). Another common problem is a air filter that is plugged.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 07-27-2001, 04:25 PM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Or you could also simply try and see if your cabin filter is old/clogged, or in need of replacement. This could restrict air flow.
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 07-27-2001, 09:46 PM
JimF's Avatar
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,924
. . .check this thread

should answer all of your questions, complete w/ picture: A/C blower's output is low . . .
Regards . . . . JimF
'94 S500 Cpe

Visit my Mercedes Web Page
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Old 07-30-2001, 09:51 PM
Registered User
Join Date: May 1999
Location: Somers, CT
Posts: 73
See the JimF thread, posted earlier.

I followed his advice and procedure and everything went
very well.

You will need a large philips screwdriver and a T-20 torx.

As a rehearsal, I removed the cover and the air filter
to make sure that I could see the part and all the
connections. THEN, I ordered the part here from
the website. I also ordered a new air filter.
The new part (blower regulator) was $238.00 and the
filter was about $38.00.

You will probably want to provide the VIN number so
that you will make sure that you get the correct part.

I figure that I saved about $500.00 for the dealer
solution of replacing the blower assembly.

Thanks JimF and the Mercedes Shop!
Ralph Burnette
1993 300SD (286k + miles)
2000 SL500
2001 ML320
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