You are correct, the engine coolant high temp sensor is located on the cylinder head. The water high temp is located below where I was talking about. Thank you for correcting me. I never said I was perfect. Either way, both sensors are near a potential exhaust leak.Thanks a lot Ara. I believe it is due to exhaust heat escaping inside the unit because the machine is operating at nomal temp. The 240 degree sensor is actually located at the top of the unit on the back of the cylinder head. With the covers on the heat is contained inside and the fan forces it out the back to the area of the sensor.