Larry,

Do most of the older mb's (123 and 126) have pretty poor ac performance in stop and go traffic, (ie the system doesn't really blow that cold while at a traffic light).

I have found that the engine really needs to see 1500 rpms or more for the compressor to start working well.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)