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Try unplugging the battery for 5 min's to re-sync the dual climate controls. If that fails it is likely that the air temperature control blend door is sticking to in the heated air position, this is either due to the door being warped and sticking inside the duct work or the electric actuator for the door being defective, both are usually replaced.
Same problem on my 98 Regal GS; remove glove box, locate the blend door actuator, (black odd shaped box with metal "ring"). Remove the box and manually turn the blend door shaft it was attached to. If you get cold air, it's the actuator you removed. About 30-40 dollars.
its located on heater box, there are 3, what you do is watch each one as you move selector to vent ,deforost, hot cold etc, watch to see which one is no moving.should be on drivers side. hope this helps.
The actuator door on the driver's side is out of position and needs to be reset. Remove the negative battery cable for 1/2 hour to reset the computer. Start the HVAC system and you should be able to hear the door adjusting itself and cold should come out of the driver's side vent.
The controls are controlled by a vacum box under the dash on the passenger side. It is possible one of the lines came off or one is cracked. If this is not the problem then try switch in back and forth a few times so see if it can get the flap unstuck, if not you will probably have to tear the air duct apart and get it moving.
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!
The battery change and the problem, may coindental or maybe not, your air regulator door actuator is probably stripped our just worn out, the regulator is attached to the damper that controls the drivers side air over the two coils. shouldn't be to hard to locate, but will require laying on your back and removing the under dash panel. it will probably be a small rectangular shaped module mount to the duct at a damper door! i hope this helps, if you want exact instructions they can be found at alldatadiy.com for 20 bucks. Merry Christmas!