Hello all I have a 2004 RX 330, my issue is with the heat on the drivers side, when I turn the heat on and set it at a temp say 75, the vehicle warms up and the fan then comes on like normal, but after that I get cool air from the drivers side only, the passenger side seems to stay warm, just curious if any one else has seen this issue Thanks

Check the coolant level. RX radiators have been prone to leaking.