Well, that's what I thought it would be something as simple as the signal not switching the valve to allow hot water in the heater core or not opening the air flow the right way, but as long as the dealer / Lexus is footing the bill for all this warranty work, I don't mind.
What I would really like is to see the difference in the parts, or at least a logical, plain English explanation but as I will be overseas for awhile, looks like my wife will be taking it in for the repairs and probably won't get details like tht from them; be interesting to see the service sheet if they give us a copy however.
Thanks for response, so many RX-350 readers looking at this and no one has even said if there heater is working properly yet, come on guys, it is a forum, share any information! :)
If this is on facebook, I would definitely like what you wrote. Thanks for your post anyway.