As my Car (Corolla X 2003) done 124450km.. recently i overhaul my engine due to it overheated and my ring, piston and gasket damaged. now my car again over heating i have both tank full of coolant.. when i stop car at home then i hear some noise and vibration in engine.. some time it overflow the coolant aswell.. now mechanic is saying its normal:-! no need to worry.. today i direct car fan myself aswell due to overheating.. need suggestion