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Take battery cable off for 5 mins, then put battery cable back on. Insert your key into the ignition turn to on but don't start the vehicle wait 5 seconds turn back off repeat the key on/off three times. This initiates a re calibration of climate control equipment and actuators. It will fix your problem.
You have 1 of 2 problems. Either your freon charge is running low or the damper control valve is faulty. The second issue is more likely than the first.
Try this, Go to the battery and disconnect the positive terminal for about 20 seconds, then connect it again and turn the key to the on position. If this seems to fix the problem your damper valve is about to break. This valve is made out of cheap plastic and as it wears it tends to stick; the disconnection of the battery forces it to correct its alignment.
If the above procedure doesn't work then it may be your freon charge running low. For some reason, when the freon is low it saves all the cold air for the passenger and all you get as the driver is hot air.
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.
This is either an out of phase issue or a temperature control blend door or blend door motor actuator problem, it can also be the climate control module in the dash, 1st try disconnecting the battery for 5 min's to re-sync the climate control module, if this fails u will need to find out what blend door is the problem or if they are ok replace the automatic climate control module in the dash
I had the same problem when i was working on my 1999 Buick Regal and had to disconnect the battery. I didn't reconnect in the same way that I disconnected the battery from the terminal and noticed that the driver side had no heat or air but the passenger side did. I then disconnected the battery again and reconnected it the same way and now have heat and air on both the driver and passenger side. Hope this helps. Good Luck!
These problems are usually caused by a faulty blend door actuator which controls the position of the air mixing door, and in vehicles with more than one air zone (passenger/driver, front/rear, etc.) there will be a door/actuator for each. These electric blend door actuators are self-calibrating - there is a feedback circuit (wiper type potentiometer) that tells your HVAC control the position of the door. It is not unusual for this potentiometer to wear causing loss of signal at various positions, which then will cause erratic movements of the door (if the circuit fails to open circuit or shorting, the door will default to fully open or closed - i.e. hot or cold air only).
On most climate control systems you must have the ignition switch in the on position when you put the battery cables back on the battery. Then let the car sit for about 1 minute for reset. Put the neg cable on first then the pos cable on last .This should do it good luck