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The control unit for the AC on my ZH Fairlaine has stopped switching from floor/vent/screen etc. I think I heard the vacuum controlled flap drop just prior. Since then AC is blowing around behind dash but not going to any of the vents. Anyone got any clues and or experience?

While I'm here anyone else have a Sportsman? I've had mine a few years now but haven't come across any others yet.
 

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Sounds like the ducting has come loose. I'm a yank, don't know much about under your dash or when your car was made.
 

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Ok; in escalating order of difficulty to fix, the problem will be one of the following:

a) the vacuum source tube for the air controls has come off the inlet manifold;
b) the vacuum hose has come off the blend door (the flap that control the air mix) vacuum motor;
c) the blend door control shaft (the one between the blend door and vacuum motor has broken);
d) the vacuum motor that moves the door has failed; or
d) the shaft that the blend door swings on has broken.
 
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