Here are some ideas from the UK Ford Transit Forum web site......
Re: Manually changing the direction of the heat blower??by markspark71 » Sun Jan 20, 2013 5:19 pm
if you take off the heater direction blower knob you can put it direct on the side of the heater box and turn the direction from there, set it to what you want then replace the knob back in the dash, this will only work if its the cables that are at fault mine has a problem with the heater box the flaps dont move even whe all is disconnected
Re: Manually changing the direction of the heat blower??by markspark71 » Mon Jan 21, 2013 6:47 pm
on the side of the heater box (drivers foot well ) you will see 2 blocks a white one and a black one each has 2 cables on it the white one is the one that moves the air direction the black one does the hot - cold setting. The air direction knob can be removed from the dash and placed direct on the heater box, is this dont work remove the white plastic block with the 2 cables going to it its held on with 3 clips now place the know on the side of the heater box and try to move again if that dont work you will have to unscrew the plate on the side of the heater box and find out which of the 2 levers is stuck hope this helps