I went thru this process a few months ago. At some point, MB put larger compressors and 2 cooling fans on the 124... Those cars, apparently, take the 134 changeover better. We did ours this summer, and it's not bad. Consider that we live in South Texas - "not bad" is pretty good, most places.

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)