Ok, I've searched up and down on this forum to find an answer to this. I don't know; do these older MBs just not have what it takes to cool the cabin in my Texas heat? I have been having alot of problems keeping cool, especially when sitting at a stoplight for extended periods. Does the monovalve come into play with this sort of symptom? About two months ago, my mechanic added a can of freon. Oh, yeah, I guess I should say that this car has had a R-134a conversion. Is this the problem in itself? I know the car was designed for R-12. I have the availability to re-convert back to R-12, and have been wondering all along if this would be the best way to go. If I do, is a parallel flow condenser needed with R-12? I know, way too many questions in one post, but I'm tired of sweating at the stops!!

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'85 300D 190K miles
running on B100 Biodiesel since 156K, SCRATCH THAT! I can only find Biodiesel at 1 location in Houston! (not very convenient)