I have a 2000 Plymouth Voyager 2.4l, 4 cyl. Mini van. My blower motor was replaced. Prior to this replacement, although the blower motor was going bad (which was noted by the barely blowing air, and how the motor eventually slowed to a stop), whenever it did work, air blew out of the vents. When the van was returned to me, no air or heat would blow out of the vents, despite the motor running strong. Right now, the mechanic cannot figure out why air isn't coming out of any vents. Actually it comes so subtly that it doesn'tfeel as if any thhing is coming out. You have to place your hand near the vent to feel that is even on. There's also a high pitch noise, which wasn't there before, it sounds like a vacuum's suction house is plugged up. Some air is escaping under the dash, at the same time as the upper vents, but that's also very subtle. He says that he's replaced the air door, but it still isn't blowing. Thank you in advance for your help.