2012 CT200h 120,000 jackhammer engine sound on acceleration. Dealer said needed new short block due to warping. What? No dash (dummy) lights to indicate overheating problem. Check engine light reported misfiring on two plugs. $7,000 repair. I will NEVER buy from Lexus again after being scoffed at by Lexus national on helping with repair cost. Stupid question, but should my vehicle give me some sort of idea that there was a problem with overheating, or am I just an ignorant car owner expecting too much from Lexus engineering?