Make sure that the fan is rotating in the correct direction. If not you will have to reverse the wires going to the motor. Check that all of the actuaters are working, a vacuum leak or a hissing mode switch will affect the actuaters from moving correctly. The different speeds are controlled by the fan speed switch selecting the different relays and not different taps on the motor. Make sure all of the ducts are connected, a missing or badly fitted duct will allow too much air to escape and you will have less comming out the vents. This means check the seals going to the doors and the duct inside going to the vent on the door panel. David Teitelbaum vin 10757 --- In dmcnews@xxxx, Mark Noeltner <mark@xxxx> wrote: > There is a rubber boot that connects the rear of those two center vents to > the main air duct behind the dash. Have you verified that the boot is > connected properly? I had this problem after a radio install and