The coolant pump is driven by the camshaft timing belt. The pump also tensions the toothed belt. The coolant temperature is regulated by a thermostat located in the horizontal outlet of the crankcase.
Figure 2.45. Cooling system diagram in Volkswagen SR engine models: 1 - Heater; 2 - Equalizing tank; 3 - Cooler; 4 - Fan; 5 - Thermostat housing; 6 - Coolant pump.
Figure 2.46. Cooling system diagram in Volkswagen DW engine models: 1 - Heater; 2 - Valve; 3 - Cooler; 4 - Equalizing tank; 5 - Bypass; 6 - Thermostat housing; 7 - Head.
Figure 2.47. Cooling system diagram in Volkswagen DV engine models: 1 - Heater; 2 - Valve; 3 - Cooler; 4 - Equalizing tank; 5 - Bypass diameter 6 mm; 6 - Bypass diameter 6.5 mm; 7 - Head; 8 - Thermostat housing; 9 - Oil cooler.
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