AC, Check engine light

I have a Ford Escape 2012 Runs perfectly.

But the last 3 days have been extremely warm, so I have been running the AC for the last 3 days. Today my check engine light came on, I thought it would go off after the car sat because I didn't need it Fri or Sat But it is still on. ALSO the passenger side vents blow very cold air, while the drivers side blow cool.

Last month I had to replace the rack n pinion not sure if that has anything to do with it or not. Any suggestions, would be greatly appreciated.