AC blows out the top defrost vent and floor vent...the switches back?

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Just to clarify you've made sure you have good vacuum on the HVAC line and the line to the heater control valve isn't leaking?

Thanks!!! That was it, the line behind the coil pack was pinched. A paper clip, hair dryer and a pair of pliers got it back to normal....all is good now. Cold AC thru the vent. I hope the rest of the guys with AC problems get them figured out, seems to be quite a few of them I see.