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alan, you may have a broken blend door arm. this happened to my 90 and the air would not come out the dash or just so-so at times.
you need a good shop manual to remove the HVAC unit from the car to replace the blend door. the part that breaks is the top of the arm on the upper part of the blend door.
these doors were only available at the dealer and they weren't that expensive.
if i remember right, if you can get the dash apart far enough,you can just see the top of the arm to see if its broken. the approximate location for viewing is just to the left of the radio area and back on top the HVAC housing.
i also did one of these in an 89 new yorker, exactly the same problem as the 90 imperial. i even used my 90 service manual to do the repair.
if you find this to be the problem, i could email you the chrysler part number for the blend door assembly.
frank
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