So when you say the A/C runs hot on the driver's side, you are talking about the air coming out of the vents? Adding water to the radiator is what is throwing me off because these are different systems so I just want to make sure I am understanding the issue.
Then I also understand that you have dual temperature zone? Meaning you can adjust the driver side and passenger side temperatures independently?
If this is the case then I suspect the air temperature actuator on that side as failed.
Images (Click to enlarge)
Friday, April 30th, 2021 AT 12:27 PM