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No Lexus specific but I had similar issues in another car. It turned out that the coolant was low! The readiator had enough coolant to keep the engine from getting hot but not enough to provide warmed air. Don't ask me about the plumbing of the system or anything because I don't know. I know that it happened a second time and I then put in a new radiator - no more problems. If it isn't that then you may have something wrong with the selector switch. Does anyone know what the conditioning system uses to switch from hot, to cold, to ambient? In older cars it is vacuum.

Gary

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