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There should be ( 2 ) slide switches or buttons that control passenger/driver side climate control, one of the switches is not operating correctly and probably be faulty. I have a 1991 Buick Regal with the same problem, sometimes i can slide the faulty one real fast to the right and back to the left and it will work fine.
either the air duct under the dash is broken or diconnected, or you have a broken or disconnected vacume hose or line. unless you have seperate/digital controls for dr/pass air. if that is the case then you need to replace dr side control unit.
My 02 Century has dual temp controls . One for driver for passenger. Make sure you don't have the dual climate enabled and just set for heat on your side and AC on the passengers
THIS IS A GUESS. Both sides probabley have "mix" dampers that regulate temp by mixing hot and cold air to make you comfortable. Passenger side must not work properly, stepper motor? Dirty actuator? Temp sensor on passenger not working? Don't honestly know but I'm not sure a do it yourselfer could figure it out. Sounds complicated.
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