So I have a 2005 G35 Sedan that's developed an odd interior heater issue (since last winter until now). When the heater is blowing, the driver's side blows cold (outside temperature air), but the passenger side blows hot. This doesn't appear to matter if it's in climate control mode or manual mode. I can't get warm or not air to blow on the driver's side. The only other issue is when the setting for the blower to your feet (normal heater mode), the air doesn't seem as strong as with the dash vents (normal AC mode). Not sure if the 2 items are linked. Any ideas? Thanks in advance for suggestions!

In case anyone wonders, yes the AC works just fine in both manual and climate control modes.