AlB

I am halfway thru a 300 mile roadtrip last w/e and I start to notice it is getting warm in the cabin. I put my hand over the vents and don't feel air moving. The AC is in auto mode so I crank down on the temperature dials. The fan motor is humming full speed but there is no air (hot or cold) coming out of the vents. I try turning fan switch taking it to manual and the same thing. Spinning fan motor with no air. I turn system off, lower window and suck in fresh air which is more comfy than AC, but not ideal for driving at 75-80 mph. about one half hour later, I turn on AC and it works normal. A while later, stops blowing air. A while later, blowing normal. I haven't had a chance to take it in for a check up but my phone call to the service dept hints at a low refrigerant charge???

Anyone have similar issues?

Al