THE MOST COMMON CAUSES FOR AN ENGINE TO OVER HEAT ARE:

COOLING SYSTEM LEAKS WHICH IS A PRIMARY CAUSE FOR ENGINE OVER HEATING.

THE WRONG COOLANT CONCENTRATION, SO BE SURE TO USE THE CORRECT COOLANT 

RECOMMENDED FOR YOUR VEHICLE. A BAD THERMOSTAT, THE THERMOSTAT CAN BE STUCK

IN THE CLOSED POSITION CAUSING THE COOLANT TO STAY IN THE ENGINE CAUSING IT TO 

OVERHEAT.

BLOCKED COOLANT PASSAGEWAYS, RUST, DIRT, AND SEDIMENT CAN BUILD UP 

WHICH CAN CAUSE THE SYSTEM TO BE UNABLE TO PROPERLY CO...