My driver side wont heat. passenger side is fine. Where can I find the driver side servo? 2004 lexus is 300 base model

 

The mode and air servo are on the Passenger side of the console. Behind the radio. There is no servo that does driver or passenger side flow. If there is no flow. You may have the vent at that area turned off or blocked. The mode servo only sends air to the windscreen, floor, and vents.