1993 buick park avenue ultra

Many Buick come with factory dual zone heat and air controles . . Check to see that both controlled are in heat mode

The mode door is stuck for passenger control.

i just bought a 98 park ave and i had the iossue of hot on passenger side and cold out the driv ers i was told i had to replace the control head and both accuators...... i did a trani flush and it fixe my problem

flapper doors inside duct blocked or not actuating

THE SWITCH FOR DRIVERS SIDE CLIMATE CONTROL IS BAD

assuming you have an electronic controlled (digital) dual zone system, it is most likely your heater blend door motor has failed, check and see which side is operating and buy the one you need and replace, it has 2 or 3 screws on the side, i think size is 4.5 mm or 5.5 mm and you have to take off lower plastic cover under dash and remove screws which go on horizontally... install heater door with temp swithched to the middle, move door to middle, if not you need to place new motor into plug before installing and turn temp to cold, then turn by hand the white blend door tube to match motor then install... make sure you turn off ignition when working,,,

open the glove box and make it fall down.behind the glove box there are two melel rods one on top one on the bottom. move the top one to the passager side, everytime you shut the car off you have to do this

still low on charge usually problem.

U need to replace the air temperature control blend door actuator motor, this requires removing the dash to access the motor for the blend door.

sounds like the drivers temp door actuator is not working should be located on the drivers side of the air box down by the gas pedal or center dash area