Oregon Skid Steer

This is a dodge 2000 extended work van. At first, the a/c only quit blowing when you were trying to accelerate quickly. Now it won’t blow when you are accelerating slightly or even cruising at a constant speed. It only starts to blow when you start to decelerate . Then it works perfectly.

Any thoughts?

The van has about 170,000 miles and many of those miles have been hauling a trailer and a mini-excavator, mid-sized.