1994 E-150 No rear air!

Anyone know why I can't get cold air out of the rear vents even though I get cold air out of the dash vents? Air and heat were all re-done last year. The mech. that did it doesn't seem to want to work with me! Ideas would be appreciated Thanks

Maybe the rear blower does not work. It is located at the rear driver side of the van. If you do not feel any air coming out of the rear vents, but you do feel air coming out of the front vents then that is your problem.