Coolant circulation is controlled by a thermostat. As long as the engine is cold, the coolant circulates not only in the cylinder head, but also in the engine block when the heating is on - in the heater heat exchanger. As the temperature rises, the thermostat opens a large circle of coolant circulation. The liquid is driven through the radiator by a constantly running coolant pump. The liquid flow flows through the radiator from top to bottom and is cooled in the finned tubes of the radiator by passing air. The fan behind the radiator serves to allow sufficient air flow, while additionally the air flow generated by driving passes through the radiator.
Cooling scheme for 8-cylinder engines
a. Thermostat. b. Plate for closing the small circle of the cooling system. 1. From the engine to the radiator. 2. From the radiator to the thermostat. 3. Leakage in a small circle of the cooling system. 4. Supply from the expansion tank to the radiator. 5. Line to fill (pouring). 6. Excess fluid drain hose. 7. From cylinder head and heat exchanger. 8. Heater return channel in the cylinder block on the right. 9. Body heater.
Cooling scheme for 6-cylinder engines
1. Starting automatic heater. 2. Radiator tube. 3. Thermostat. 4. Radiator. 5. Coolant pump. 6. Temperature gauge sensor. 7. Carburetor. 8. Cylinder head. 9. Cylinder block. 10. Body heater valve. 11. Body heater.
Coolant pump and thermostat housing (8 cylinder engine)
1. Thermostat housing cover. 2. O-ring. 3. Thermostat.