I think the big expense on a/c's on MB's (i.e. 124's, 140's, 202's) is the evaporator, which is buried underneath the dash.

I've read it's about 15 hours of labor on a 124 to replace one, plus whatever the evaporator costs.

I've also read that it's better to use an aftermarket evaporator from a company called ACM, as their units are made from aluminum.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".