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Old 01-26-2008, 03:15 PM
Bruce Kennedy's Avatar
Glutton for punishment
Join Date: Oct 2006
Location: Cincinnati Ohio
Posts: 230
Climate Control conversion editorial coming in the near future

Last summer I transplanted the manual heat/AC system from a 1980 240 into my 85 300td. The conversion wasnt terribly difficult, just time consuming, and a good bit of that time devoted to restoring the heater/evaprator box from the 240. When Andy has the time to help me with the computer I'll post an editorial on the project for those interested.

a few mb diesels
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Old 01-26-2008, 04:11 PM
Registered User
Join Date: Sep 2001
Location: central Texas
Posts: 17,277
Cool and Hot,
We don't usually get advanced notice of these things...
Certainly seems like a worthy goal....
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Old 01-26-2008, 04:33 PM
blackestate's Avatar
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Join Date: Aug 2005
Location: Washington State
Posts: 948
oh, come on... Do not tease me.... I got 2 of those CCU's....
Done yet?
83 300SD Dark Silver Dark brown inside
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Old 01-28-2008, 10:31 AM
Bruce Kennedy's Avatar
Glutton for punishment
Join Date: Oct 2006
Location: Cincinnati Ohio
Posts: 230
climate control conversion

I dont mean to tease anyone, but if your really want to do this conversion you can go ahead and find a donor car. 1980 is the best choice because of the manual A/C control. (Earlier 123's have the manual A/C controls but the evap/ heater box flaps are not as controllable and the harness is different because they used the York compressor).Start by removing the evap/heater box and then the wiring harness for the A/C system. Thankfully this wiring harness is a separate harness from the main one. There is only a couple of wires you will have to cut, one going to the gauge panel and one to the hazard switch. Make sure you label all the wires to be sure where they go. Your next step will be to rebuild the evap/heater box. This entails a complete dissasembly of the unit to replace all of the foam seals on the flaps. I have now taken apart four units and on everyone the foam seals where totally shot. This is a good time to also replace the vaccum pods as well. Once you do this it will function as it did when new.
a few mb diesels
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Old 01-28-2008, 11:58 AM
AMH AMH is offline
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Join Date: Jun 2003
Posts: 219
Sounds like an excellent idea. When I stripped my '82 240D, the heater/ac box and controls went in the garage along with other items. Type I and III controls/ac are among the easier units to remove and repair. I could see replacing a PITA Type II unit with the Type I.

Keep us posted. It sounds like another listing to convert to a PDF file and burn to CD.


Political Correctness is NOT part of my vocabulary

'82 240D Stick
'85 300D Auto
Drove my first MB at age 16 1960 300SL W190
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