so i think i got it ruled down to the vaccum solenoid.
when i started the vaccum pump was running continiously
make a tee in line so had just the defrost/vent/floor isolated........ vaccum pump pulled it down and all controls seemed too work fine
pull off vaccum into solenoid and...
air on on defrost
i have the same kinda problem gdf250 is having the air only comes out thru the defrost. i found a broken vacuum line at the front passenger hub. fixed it and now if i move the 4x4 switch air will come thru the vents for a a minute or so and then will switch back too the...