Go to auto parts store, rent the radiator pump up tool, then clean the top of the tank where it's weeping, with soap and water, inside and out. Gently re crimp the aluminum I have used a socket extension. It just takes a slight tap. There is a large o-ring under it, and more clamping force generally fixes the weeping syndrome. Then fill the cooling system back up, and pump up the radiator to 18 psi and see if it's still weeping...

Total cost of repair: 2 hours of your life... No parts.

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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!