Chrysler Repair: LH:power seats & windows, AC temp door probs., yorker landau, fuse box

Question
I own a 1999 new yorker landau mark cross.  The passenger window will not operate.  The power seat on the driver side does not work.  The air conditioning does not work.  I am told that it is an air flow problem because the compressor and  system is producing cold air but hot air is being mixed with cold.  Is there a gate that is not functioning or is this an electrical problem.Is there switch that  is not functioning.  

Answer
Hi Ken,
Taking these questions in order:
The fact that the passenger window only will not operate means that power for the system is present at the master control switch. But because neither the passenger door switch not the master switch will activate the window suggests that the problem is in the local door switch or the  motor of that window. Lift out the passenger door switch and check if 12V is present on the yellow wire when the ignition is in the run position. If it is not, then that wire from the master switch to the local door switch is broken. If there is voltage then the problem is with the switch internal electronics or the window motor. Measure the voltage between the brown and the violet wire of the switch when you request motion, both up and down. If you don't see voltage that reverses polarity then the problem is internal to the switch. If you do get reversing voltage, then the problem is with the motor inside the door. You will have to remove the inner door panel to reach it. Let me know if you need instruction for servicing the motor.
On the power seat, the situation is similar. There is power to the seats, but maybe not power to the driver seat is interrupted. I would look under the seat for a two wire "natural" color disconnect which may be disconnected. If not, then check whether you get 12v between the two wires on the incoming side of the plug (the wires are red and black) when the ignition is in the run position. If not then the wire from the fuse box to the plug is open. If present then there is a problem inside the switch or the black ground wire from the disconnect to ground point is open (check that latter issue with an ohmmeter). Because there are several motors and none work, it pretty much is limited to either the power to the natural plug or an open inside the switch.
On the AC, there is an electrically operated blend door inside the unit which decides how much cold and warm air are to be mixed to control the temperature. A motor actuator controls the door, and it is located on the underside of the unit, and is square with its own electrical plug. You could check the voltage at that plug for variation as you change the temp selector. It may alternatively be that the blend air door is mechanically binding. It may be possible to remove the actuator motor to check the shaft of the door that it moves for freedom of motion. I can xerox and postal mail you the pages from the manual that describe the system so you can see whether you want to try and service it. Just send me your mailing address. You can reimburse me for copying and postage after you get the materials. It should be about $1.50 which you can reimburse by sending me some postage stamps. Please tell me if you the automatic temp control unit (Digital readout) or the conventional control unit.
There is a self-diagnostic test which can also be run and I can email you that procedure after you tell me which unit you have.
Roland