99 Buick Regal LS dual climate control. No heat passenger side.

Does the vehicle have dual zone climate control, where the driver side and passenger side have different control? Sounds like a blend door issue on the driver side. Why did you replace the passenger side, was it blowing hot too when AC was on?

Hi Levi, Im AL the owner of Big As Auto Repair.

Levi, If you have the same climate control, then below is a link to a repair video for your climate control. Sorry, this is the part 3 video, look a the side to find the part 2 video and watch it first.

1997 03 Buick Regal climate control display repair part 3

driver side actuator for blend door is electric servo controlled. It could be jammed or computer sending it in wrong direction. Unit is located on driver side of heater case.

Most likely it is the climate control unit. Had the same issue with my 99 Regal, replaced the climate control unit and haven't had any issues since. Might try Digital Dash Solutions on eBay, they will ship you a refurb at1/3 price of buying from a dealer if they have one available. If not, they also have a climate control repair service. I'm not certain that they fix Pontiac products, but it wouldn't hurt to ask.

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if it is dual zone climate control, then quite possible is the driver's side actuator or blend door.

It can be low on freon,or,the actuator motor foor that side blend door is bad,if so,the dash has to be removed to replace the actuator motor.

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

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!

Most likely the blend door motor is defective.