Originally Posted by 73Elsinore

In regard to your first question, I once had a Ford Bronco II that would do exactly that same thing. The A/C would work fine for 3-4 hours and then would gradually stop blowing air, even with blower running full speed on max. The cause turned out to be the evaporator was freezing up, i.e. the coils on the outside were getting blocked with ice and that would prevent air from blowing through the coils. The cure was to turn off the A/C for about 10 minutes to thaw out the evap and then it would work fine again for another 3-4 hours. This only happened on long road trips. The evap drain tube was wide open, so that wasn't the problem. I never had it checked out and I just lived with it since the car did it from brand new.