When I turn on the air conditioning,blows out front defrost vents on 2005 Ford Excursion

When I turn on the air conditioning, the rear ac blows ice cold but the front vents only blows warm air like just the vent is on. Fuse# 27 & 110 is good.I put a new vacuum pump and front blend door and heater valve. No luck.

1 answer
Poss. restricted front evap.