Thank you for this very useful post. If I have to go back again with low coolant, I will have the mechanic flush it out and bring your instructions with me. But coolant has held for 1 week, so am hoping the air pockets are gone.
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Having the same problems with my 2005 lexus rx300. Heater blows cold air no matter what. It has spurts where it blows hot air but only for a few seconds. I checked the fuses and they seem fine because they aren't busted or anything. Contemplating its the motors but unsure and wondering how much it would cost.
All of the Lexus models use the same servos. I tried to fix mine in my RX300. But the problem came back. So I eneded up just changing both.
Back in 2011 my problem was resolved by replacing a leaking radiator. Lately I have been hearing a clicking sound while driving, puzzled as nothing seemed off until the past couple of weeks. Very brief minute of heat even when set on HIGH and then turns to cold air. Checked out your above link to Servos and I see you mention a clicking sound... How confident should I be that it's the servos and any chance they can just be adjusted or should they be replaced (or just one of them and if so - which one)? Thanks