No Hot Air On Driver's Side

[sam2004]

Hi!

I would like to get some help to resolve this problem. I am using 2004 RX330. I is cold in Toronto now and I was trying to use my heater last week. I found that there is no hot air coming to drivers side. Only the passenger side is getting hot. Can somebody advice me how to fix this? several weeks ago, I heard a clicking sound (like a relay) from under the dashboard on passenger side. It stopped after couple of weeks. Thanks for the advice in advance

[maseace]

Here is some info from the repair manual. This is for an RX400h but it may be similar.

AirMixDamper.pdf

AirMixDamperControl.pdf

[sam2004]

Thanks Mason. looks like I cannot go through this procedure myself. Is it necessary to remove the dashboard to access these parts? In that case, I have to go to dealership anyway.