how hot is it where you are? does your fan clutch work well? does your a/c work? are you climbing any hills? any long grade climbs?
you're in canada... I think you'll be fine with the 79 rad for a few days... it'd be better still if you put an air trans cooler on there, and unhooked the cooler...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!