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Old 04-08-2004, 05:44 PM
Aaron's Avatar
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,937
1996 E300D A/C climate control issues

Hey all,

We have a W210 E-Class diesel in at the shop right now and as we're mainly a vintage MB specialist I need a little advice on a climate control issue with this car..

Problem: A/C does not blow as cold out of left center vent as it does from right center vent. Both extreme side vents are decently cool, but again, the passenger's side is cooler than the driver's side. I seem to remember something regarding replacing the monovalve with an updated part as well as a receiver drier modification with a new hose and switches. Ideas?

BTW, When in full heating mode, the temps are equalized, this only occurs in A/C mode.

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Old 04-08-2004, 06:17 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
For some reason anything that reduces cooling capacity causes the effect you describe. The most common problem is lack of refrigerant.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 04-08-2004, 10:20 PM
Registered User
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 340
AAron, please post finding re this

I have exactly the same problem with my 1997 E320. Last summer I took car to dealer and they said it needed a new evaporator - $3995, please. I decided to get a second opinion but never did. We are just now having warm enough weather to require A/C and the symptom is still there. If I had a leak in the evaporator, wouldn't the coolant have leaked out by now, leaving me in default EC mode? Doesn't the system run all the time?

I would say I get adequate cool air out of the right side of the center vent but that it is negated by the warm air coming out of the left half. Turning the left-hand thermostat down, helps but doesn't completely cure the problem. I(s the evaporator in two sections?
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Old 04-08-2004, 10:25 PM
Registered User
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 340
Corrections to my last post

Sorry, Aaron, I used double capital A's in addressing you. Also, I should have said refrigerant instead of coolant. it's been a long day.
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Old 04-09-2004, 08:32 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
If the refrigerant IS full then many times the problem is a slightly plugged drier. Check to see if there is a COOL spot on the high side(HOT) lines around the drier.

okc329, The W210 chassis evaporator job takes 14-15 hrs & list on the evap is $740 & drier is $80.

$900 in parts incl tax & 15hrs X $100@hr = $2400

Iwould do that job any DAY for $3900!!!!!!!!!!!!!!!!
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Old 04-09-2004, 12:50 PM
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Join Date: Feb 2002
Location: St. Louis, MO
Posts: 340
Thanks, M.B. Doc,

there was no way I was going to give them the money they wanted to do the job. Glad to have some reasonable estimate of the cost though.

Does it seem reasonable that I could drive the car for 7-8 months in AUTO climate control mode after the dealer diagnosed the problem as a bad evaporator and still have cooling capacity ?

I didn't like the diagnosis because they said, "We couldn't find a leak under the hood, so your evaporator is bad."

If Mercedes Benz's sliding quality doesn't take them down, then their poor dealer service departments will. Not to say that all of these are bad but the two in my town bolster no confidence in me.

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