2003 Buick Rendezvous

Engine Cooling problem
2003 Buick Rendezvous 6 cyl All Wheel Drive Automatic 120000 miles

My Buick Rendezvous is leaking what looks like bright yellow coolant out of what I am guessing is either the tranny cooler or the cooler for the air conditioner. It is the cooler in front of the radiator that it seems to be coming from and it just started after the air was recharged yesterday. The radiator fluid is not the same bright color that is leaking out and the car is not overheating. Can a stop leak product be used and how would it be used or does it need to be replaced.
June 4, 2010.

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