The cooling system operates under the action of a water pump and a thermostat. Frost-resistant coolant must be used in both winter and summer. Before the start of the cold season, check the frost resistance of the coolant. The system has a valve to maintain an increased pressure of 1.20 to 1.35 bar in the cooling system and, consequently, increase the boiling point of the coolant to 120°C.
In order to avoid collapse of the coolant hoses during cooling, another valve is provided in the radiator, which opens at a pressure of 0.06 to 0.10 bar and passes air into the cooling system from the outside.
The coolant flows through the radiator from top to bottom and is cooled by the air flow. It is taken by a water pump from the lower radiator tank and fed to the cylinder head.
The cylinder head is designed so that the coolant is channeled directly to the valve seats for intensive cooling. From here, the coolant is supplied to the crankcase jacket and then it is again on the front side of the cylinder head and through the open thermostat through the hose is supplied to the upper radiator tank, where circulation begins again. At coolant temperatures below 92°C, the thermostat remains closed, and then the coolant is sucked in by the water pump directly from the cylinder head and is fed longer into the channels of the cooling system.
This results in fast and uniform heating of the engine. At a temperature of 92°C the thermostat opens, and at 107°C it is already fully open (engine 1.3 l 103°C).
Cooling system volume
- Engines 1.0-L - 6.1 L
- Engines 1.2-L - 5.9 L
- ONS 1.2- / 1.3-l engines / manual gearbox - 6.3 p
- Engines 1.3-liter / automatic transmission - 7.1 liters
- Engines 1.6L/Manual - 7.9L
- Engines 1.6L/automatic transmission - 7.6L
- Engines 1.8-liter / manual transmission, diesel - 7.6 liters
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