Acblows cold on passengerside but warmon driverside on1999 aurora

check the air actuator door hoses your under dash vent doors are not working

Sounds like a vacuum leak.

There is a door actuator motor that is bad and the dash has to be removed to replace it.

you either have a vacumn pull off that is bad or a leak/vacumn leak going to it also you need to check the blend door inside the AC box to make sure it is not stuck/ or something lodged in it to insure the door has maximum travel range

You need check the level with a gage while its on and blowing high on the low side the ac.
either it need R134a added ore you might have leak. Best thing is check the level first and if low add the dye to see where leaks out and then top off the ac until full but you cant over fill it ore it loc up the ac pump

climate unit is bad

Try either having it recharged by a pro or I believe you can go to auto zone and by the ac recharge in a can. I f that doesn't work it could be the trinary switch.

Most probably you have a leak some where.
What you can do is have it checked proffessionally , or if you like to do it your self :
Pressure fill the AC with AIR and you can use any air pump that will fit the lines. After filling the air (up to 300, not more han that) you can get some water with soap , and put soap over the AC lines and seals and corners in the engine compartment. if any leak you will see soap bubles. If nothing shows there then you have a problem with the cooling tank , radiator inside the dash and you need to check that.

Several- The system should hold freon for years without leaking. There are pressure switches and they cut off the compressor with an undercharge and an overcharge. You need guages to measure the charge. There are testers the A/C shops have called "sniffers" which can detect a leak. If you have no leak then you need a technician to add or remove freon to get the concentration right. Or you need guages.

have your ac system tested for leaks, i recommend to vacuum
and recharged with freon with red dye.

gl G