The AC on my Fuso FG is not that cold. A poster on another forum mentioned that a dealer told him (apparently--the poster's native language is not English) that the problem is that the heater core always gets coolant flow even when the AC is on. The system is supposed to operate by diverting air away from the core while on AC, but it doesn't really work. I'm thinking that putting a valve in the coolant line, cutting off flow to the heater core during the summer should solve the problem.
Anyone know if cutting off flow to a circuit like that would have an adverse effect on other parts of the coolant flow or the water pump? Most vehicles I'm familiar with, cut off the flow of coolant to the heater when the AC is on.

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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