I took mine in to a local shop and he said it couldn't be low freon because they both share the same condenser. He thought it was the passenger side 'blend' door that controlled the blend of outside vrs. inside air. Anyhow, something like that, he checked the system for pressure, which he said wouldn't make a difference, and it was low. So he added Ice 32 (or something like that) AC additive and then filled the system back up to spec pressure. I forget the amount, but it was a big deal and he said there had to be a leak so he added dye. Anyhow, the passenger side then blew as cold as the driver. I never had any problems with my '03!!!