The only way I can think that the two can be related is that the cooling fan is not coming on. This will cause the compressor to cycle off because of the high pressure switch and then possibly causing enough pressure in the cooling system to blow steam through the radiator cap (which get weak or crack over time).
Otherwise the A/C problem could be because of increased clearance at compressor clutch. I believe this will require that you get as much voltage as possible to the clutch solenoid. If there is a thermal switch on your compressor, the recommended fix is to bypass it. There are relays and a lot of smoke and mirrors between the ON switch and the compressor. Check the charging voltage at the battery. If it charging at less than 14 volts look into it. I found a bad positive battery cable (factory installed) on mine that I discovered beccause the starter began to drag. I made an additional cable from 6 gauge marine cable and lugs and installed it parallel to the old cable. This fixed the starter problem and also fixed about 98% of my compressor disengaging problem. I plan to see if I can increase the size of the feed wire between the connector under the microprocessor to the compressor. This beats the $500 (wholesale) parts only bill to replace the compressor and dryer.