I have a 1994 Oldsmobile 88. The AC works well but at any setting, Upper, Recirc, etc., the two vents on the passenger's side only emit luke warm air. The volume of air emitted is about the same as the driver's side which does emit cold air.

Anyone have any idea why this would be going on and what I need to do to get air flow from all 4 vents?

Thanks in advance.