Just to recap, do what Vstech and others have said, clean the condenser and radiator if necessary with commercial coil cleaners. Made an 8 or so degree vent temp reduction for me. So far in the late spring.

__________________
1985 300D-189k The 'UD', Ivory and Pinkamino
1979 300D-211k Dark Gray, Parchment
A 1980 Harley-~166k and
A 1994 Ford diesel pickup-349k and
A 1990 gasser Volvo wagon-145k