Lots of people complain about the AC but I don't know anyone who's done a vent air temp test at varying speeds. I was wondering about air flow over the condensor too. It's a cab over truck. Condensor is mounted horizontally behind right front bumper with a fan sucking air up thru it. Bottom of the condensor has a plastic device with slanted fins designed to direct air up thru the condensor. Those fins are about 2 inches long. I don't know how hard it would be to suck air up thru that condensor at speed.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13