[vabear]

You should see in the normal mode, +45 -+50 F at the center vents at idle and +40 F at 1500 RPM or greater. Also when the system is at full charge the manifold gauge should read in the 35 psi to 40 psi range. If no air from center vents i would suspect the air distribution motor is not opening the flapper valve for that vent.