By "coolant" you mean Refrigerant/R-134a, correct?Passenger side is blowing warmer air than the driver side. Tried to add coolant, but it pushes back out so I assume it is full and I must have a blend door issue.
This is awful vague, and if you're stating what creek said, he was vague as well.....If refrigerant is coming out and your ac is overfull you ac will not work well....
He's right, the only way to even have a clue to what is going on with your AC system is too put a proper set of Hi/Low gauges on them and operate it on MAX comparing the hi/low pressures based off the ambient for the day....Also the cans area quick somewhat fix not a substitution for proper ac work. It should be vacuumed of all refrigerant. Then oil and 134a added back in also checked for leeks. Contrary to popular belief AC systems do loose refrig without leaks not a lot but overtime it happens. I work on a fleet of over 100 large trucks that run everyday we see it all the time they last for 4 or 5 years before enough loss has occurred to require recharge.
If I were you i would use the can it may help for awhile. When I had time or money I would take it to a local shop with a 609 certified tech and the proper equipment to test and charge your system.