Hello all - 1991 Cherokee XJ 4.0l Laredo. AC blows cold, but I've noticed recently after I've run the vehicle down the road for 20-25 minutes, the amount of air coming out of the vents is reduced and it "sounds" like the blower is stopped up or something. I am assuming this might be a vacuum leak? Any thoughts on where to start looking before I just dive in aimlessly?