the evaporators freezing... as described.

my solution for big red was to initially redirect hotter air from the back of the cab via a 75mm tube and 12v computer fan into the passangers foot well.

that worked a bit but it would still eventually freeze. by accident when putting in a direct duct to spot cool for alex I broke one of the vents With the vent missing the airflow was enough that the aircon only froze over on the lowest fan setting.

as part of a maintenance job I had to degass and regass the air con when I degassed it was on the upper side of the charge limit so I dropped it about 15-20G from memory which put it only just on the + side of the correct charge that fixed everything.