Cooling
The Cooling category covers engine and hydraulic cooling-system components. You will find water and oil radiators, thermostats, water pumps (mechanical and electric), viscous-drive and electric fans, fan clutches and coolant hoses with clamps.
A healthy cooling system keeps the engine in its optimal temperature range (80-95 C), which affects combustion, emissions and oil life. Engine overheating leads to head warping, gasket failure and, in extreme cases, seizure. In heavy machinery hydraulic oil cooling is equally critical.
Frequently asked questions
How do I recognise a faulty thermostat?
Thermostat stuck open — the engine reaches operating temperature very slowly and cab heating is weak. Thermostat stuck closed — the engine overheats quickly and the temperature gauge enters the red zone. Both conditions require thermostat replacement.
When should the water pump be replaced?
The water pump needs replacing when coolant leaks from the shaft seal (visible stains beneath the pump), when the shaft has excessive play (felt by hand) or when bearing noise is audible. In many engines the water pump is replaced preventively together with the timing belt.
Can I use water instead of coolant?
Only in emergencies. Water contains no corrosion inhibitors, which leads to corrosion of aluminium blocks and cast-iron components. It also offers no freeze protection. Always use a glycol-demineralised-water mixture in the ratio recommended by the manufacturer (typically 50:50).