Your need to add more r134a Freon. When the levels are not sufficient to cool both sides the car default sends all the cold air to the passenger side and not the driver's side.
The duct probably fell off
my 2000 Chevy venture van the air comes hot by drivers vet and cool by passenger vents
Make sure refrigerant is fully charged. Does it have dual climate control? Perhaps passenger side sensor is not working properly
To remove the air vents on a 2004 Pontiac Grand Am GT, a person will have to pry them out with a screwdriver. Apply gentle pressure between the vent and the dash.
the dual climate control valve is bad This has happened to me in the past when the Freon was getting low. Shorty after this I found out I was completely out of Freon. IGNORE THE SECOND ANSWER. THE DUAL CLIMATE CONTROL VALVE IS BAD OR YOU SIMPLY HAVE THE DRIVERS SIDE ON HEAT.
The climate control is not operating for the passenger side. Check to insure the physical controls work, and the diverter vents are opening to let the cool air to the passenger side.
It is an infrared temperature sensor for the heater and ac system.
your driver/ passenger dual zone temperature switch is bad. buy a new one and replace it. $35 at any auto junk yard. easy fix.
The blend door actuator may not be working.
93 grand am... that's a Pontiac product. Burn it!
Antifreeze will be leaking in the floorboard on the passenger side, there will be a smell of antifreeze through the vents.
your blend door which cost about $1000-1500