nshift

Hey all, I have a 2007 uplander with 85k miles. purchased used from private seller. no warranty. The AC blows pretty cold from passenger side and luke warm to cool on drivers side. its not dual climate control and is manual settings. I haven't slapped my manifold gauges on it yet but what could be the issue? low Freon? does it have 2 blend doors that control passenger and drivers side? when I switch from cold to heat both sides blow really hot. switch back to cold, passenger side pretty cold and driver side back to warm/cool at best. thanks in advance