Not a clue. I'd have to get some dye and put it in there and to find out. The compressor is relatively new, we had it replaced 2 years ago. So I'd hope the o-rings engine side were all replaced.

I ran my 190E and its AC is substantially better. I got 34F at the center vents with the fan on low. The 420SEL only was able to muster 58F under the same conditions.

The 190E is running ES-12A whereas the 420SEL has R12.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k