A/c ?

I have a 1997 Ram 1500 4X4 360 motor, my A/C works great except for 2 times when it just stop blowing cold air, a little time later back to cold air. My wife drive a 2002 Jeep Liberty 3.7 motor, the same thing happen to her car, any idea what's up?
Thanks
Joe

air gap too wide- see your other posting