How to prevent engine overheating ?
Replace water pump, thermostat and radiator hoses. Have radiator cleaned at a radiator workshop. Make certain that the radiator capacity is big enough for the engine. Diesel uses 3core, petrol 2core radiators for LDV. Remove radiator cap and check for oil. Oil in the water means a cracked cylinder head. This is major structural damage to an engine. Machinist shops test head integrity via a pressure test. There must be engine coolant in the radiator. Clear water in radiator indicates poor maintenance of engine.