So I noticed that when the passenger temperature is set to the same as the driver side at 76, it blows out hot air. I have to set it to 71 or lower. If I set it to 72, the air will be hot. I think it might be the servomotor of the passenger side that has a problem (found the thread below about a GS with similar symptoms). I decided to plug in one of those OBD plugs I got and found the error code B1441. I'm going to ask the dealer to look at it at the next oil change (got extended warranty).

My question is does anyone know where the passenger side servomotor is located? I assume it's behind the glove box, but would you have to take out the stereo to get to it? I got a remote start behind there, so don't want the dealer to unplug stuff there -- I'll unplug it if that's the case.

https://www.clublexus.com/forums/gs-...rvomotors.html

 

have you tried a hard reset by disconnecting the battery for a few minutes and then reconnecting and seeing if it starts functioning correctly again?

 

That was one of the thing I tried, but no luck. The tool I got actually have an option to "initialize" the AC. I wonder if it's just the temperature offset somehow got messed up. But I don't want to clear the trouble code and then the dealer won't do anything because there is no code ...

I do hear gear noises when the air switch from cool to warm/hot -- though it doesn't sound broken, I don't know if I hear that before.

 

with that added information... at this point i would take it to the dealership, with the code still on there.

 

Small update: after 3 weeks of this issue, the AC magically start acting normal again for the past few days

 

that is ANNOYING!