Hey guys. Just got my compressor and most of the rest of the A/C system replaced. Fired it up and wouldn't you know it now it only blows to the floorboards. I saw Shoebox's site for checking the vacuum lines. I pulled the vacuum line from the check valve to the inside of the cab and got good suction there. I can't see any visible problem with that line but the switch doesn't appear to be doing anything. If I unplug the multi colored line plug I don't get suction from the black line... leading me to believe it's either pinched or broken somewhere in between but I can't see much of it... Anyone had this particular problem, or have any suggestions?

Jonota

 

Check the vacuum line that goes from the check valve to the vacuum tank that is under the battery/radiator overflow tank.Mine was broken about 12 inches forward of the check valve.those plastic lines get brittle with age,heat etc.

 

Found the problem, the line to the selector switch was pinched by the heater core cover. All fixed now!