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i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move
International 9400 9200 9900 heat box is under the passages side seat. That where the heater core location and the ac evaporator blower. You have two control motors under there one control the bunk for hot and cold. The other control front for hot and cold. Defrost vent and front vent is in the dash. My suck on defrost and in floor will open to front vent. I have not locate yet.
Seems like the dampers are partically closed,look under steering column and see your duck work for the vent system.Follow it back to the blower box.Unhook if there, turn on ac, if you get full air, nice and cold on low and high you have blockage in your vent duct work,check the vent line that diverts air to the diffrent selected vents. Also check for vent disconnection around sterring column,and defrost vent area.
1. Set blower to HIGH 2. Set mode position to PANEL (AC vent air) 3. Open all AC outlets 4. Temp. on full cold 5. Start engine 6. Push WASH and REAR WIPER switches for 5 seconds until all panel lights are on solid System will then go through it's paces as it calibrates the climate controls 7. When calibration is complete only the REAR WIPER switch/light should be flashing. Press this switch to extinguish the light and all should work normally.