Joe, driving a quarter mile with the temp light on is certainly normal. I have driven further than that on overheated engines before. It sure sounds like the temp sensor pick up the overheating too late.
Lexus as a company use to be very proactive when it comes to modifications stemming from customer's complains. Now a days, with their bean counters running the company, they would rather replace a few engines than to retro fit their assembly line. This is evident in the whole Lexus line up, the GS350 had dash rattle problems since 2006 and they are rolling out 2010 GS350 with the same problems. Unfortunately, it all about money, Lexus will not fix this problem until there is enough incident and it starts to cost them more to fix than to re-tool.
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