Most likely your AC just needs service, All it needs is some freon, Seems like when it starts running low it blows hot air from right to left as it gets low.
Your average A/C unit blows heat through all vents.
Perhaps a stuck door in the HVAC system or a blockage in the ducts.
Our '98 Mystique gets water in it thru the taillight lense heat vents (hole at highest point of lense).
The blend door actuator may not be working.
Does not matter. Air will displace naturally when pushed into a room from the vent. Vents and ducting are laid out according to the plans of the unit. That is the only reason for top vents and bottom vents. If you are speaking of the intakes, the same principal applies.
my 2000 Chevy venture van the air comes hot by drivers vet and cool by passenger vents
This may be a cause... My wife's 95 contour had to have the vacuum temp settings control unit replace 2 times. If you are constantly changing settings it really blows the valves in the climate control center... Just a thought.
Chemicals from the vents feed bacteria which, in turn, produce sugar and other food for organisms.
Cose the high vents in the winter and low in the summer..
vacuum leak?
perhaps because the engine running heats coolant that cycles through the heater core and has air blowing across the aluminum to exchange the heat into the air that is forced through the vents
Make sure refrigerant is fully charged. Does it have dual climate control? Perhaps passenger side sensor is not working properly