Okay. While ago, I have posted that on my 06 GS300 135k mi driver and passenger side blows different even though the temp setting is same. I have replaced Driver side Servo motor but no change. When heater setting is at 75, passenger side blows toasty, but driver side is cold.
What else do I need to look at possibilities?

 

Not trying to insult you...but the servo you replace was for the blend door and not the one that changes where the air comes out?

The next step I would take would be to back flush the heater core just to make sure you don't have a partial blockage on one side...

 

Yes. It is the very bottom servo motor on driverside just like this one on the link.

https://www.clublexus.com/forums/gs-...ml#post4784932

Back flush meaning, flush the coolant?

 

Yes...the opposite direction of the coolant flow...it might be moving through the heater core so slow that by the time it gets to the outlet side the coolant is cool.