The level sensor just reports what's happening, it doesn't cause other problems. Most cars don't even have a level sensor.
If the engine is overheating, check for proper operation of the radiator fan and be sure the radiator isn't blocked with debris. If that is okay, have a combustion gas test performed by your mechanic. That involves drawing air from the radiator through a glass cylinder with two chambers partially filled with a special dark blue liquid. If combustion gases are leaking into the cooling system from a leaking head gasket, the liquid will turn bright yellow.
Tuesday, September 6th, 2011 AT 7:29 PM