Very Good

I would also take a serious look at the fan motors themselves...as I see you mentioned in one post that only one fan was running..this indicates a problem b/c BOTH fan should always run in together b/c they are wired in parallel...regardless of which speed is being called for ..so , check that out ..see if they both spin nice and easy by hand and that they always start together.etc.............
Low fan is critical b/c if the a/c is working hard and the low fan is not coming on to relieve the condenser , the radiator gets heated from passive heat of condenser and the results is overheat condition of coolant.. It's a passive thing , but very common and often mis-diagnosed .

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A Dalton