if you were smart you would get a 240D or a euro car and put the manual climate control in.

the automatic climate control is another flaw of mercedes.

Dont see why you cant do it, a lot of work though

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)