The O-ring seals in the AC couplings can develop leaks. The condenser can also crack and leak, which is sometimes misdiagnosed as a leaking coupling. The condenser cracks out of sight, under the radiator support, so it looks like the coupler is leaking. Leak testing with fluorescent dye will help locate the exact source of the leak.
AC Not Cold Due to Refrigerant Loss on Ford Explorer
Average mileage: 131,866 (98,000–160,600)
10 people reported this problem
2002 Ford Explorer 98,000 mi, Visitor
Just began becoming less and less cold
1994 Ford Explorer 137,000 mi, Visitor
ac wont hold freeon