I have always been told that since R134a is not as efficient at cooling as R12, newer cars with R134a have larger condensors to allow the car to cool better.

My 1993 300E (3.2) came from the factory with R134a, and it has the coolest a/c I've experienced on any car I've ever owned, which inlcudes a large assortment of American and Japanese cars (and one Audi ).

I have always assumed that the condensor on my car is different than 300E's with R12.....

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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".