Figure 4.23. Cooling system elements: 1 - heat exchanger; 2 - coolant outlet block with integrated thermostatic valve; 3 - cooling radiator; 4 - oil/coolant heat exchanger; 5 - water pump; 6 - expansion tank; 7 - water inlet manifold with drain bolt (for countries with cold climates, a drain tap is installed instead of a drain plug); 7a - installation with drain plug; 7b - installation with heated tap
The cooling system includes a water pump driven by an auxiliary belt from the crankshaft, a radiator fan, a radiator, an expansion tank, a thermostat, a heater core and hoses (figure 4.23). When starting a cold engine, the coolant does not enter the radiator, since the thermostat valve is closed, but circulates through the block jacket and cylinder head, then enters the pump again. This ensures rapid warm-up of a cold engine. When the coolant reaches a certain temperature, the thermostat valve opens and the hot coolant passes through the hose to the radiator and is cooled by the oncoming air flow.
Caution! Avoid contact with coolant on clothing or vehicle paintwork. Otherwise, rinse the surface with plenty of water. Collect and dispose of the drained coolant.
The water pump of the cooling system is connected to the coolant outlet block by a rigid tube, the tightness of which is ensured on the pump side by a cuff, and on the coolant block side by a snap-on fitting on the upper hose and by a sealed tip on the lower hose.
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The coolant outlet block is secured to the cylinder head on the flywheel side with 4 bolts.
The coolant does not require replacement throughout its entire service life.