side1out

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About side1out

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  • Lexus Model
    RX400H
  • Lexus Year
    2007
  1. Wife's car (RX400H) has the same issue. I don't understand how blasting the heat has a significant effect on the coolant temperature. Does a head gasket leak itself cause a car to overheat or is it due to loss of coolant? Coolant levels (radiator and overflow) are fine so how would a head gasket cause overheating in this case? By the way, the car's first issues were shaking at 40mph and a check engine light related to cylinder mis-fire. Blue Devil treatments were done but not effective.