95 PA Vents blowing different temp
 

Hello Everyone, Trying to figure out what it is I need to get this going right.
I have a 95 Buick Park Avenue that when ac is on will blow cold air on the driver side and hot on the passenger side.

Last winter had an issue with it blowing hot on passenger side and cold on drivers, but I found if I turned ac all the way down and then back to heat it would then start to blow warm on both sides.

I look around online and I always see the problem being opposite on mine with ac blowing cold on passenger and hot on driver. Please any ideas or ways to trouble shoot to try and find the cause would be greatly appreciated.

Thank you for your time.