General description of the cooling system
The cooling system ensures the proper temperature in all operating modes of the engine.
The cooling system consists of a radiator and circulation system, fans, thermostat, and coolant pump.
The timing belt drives the coolant pump.
The pump circulates the cooling liquid (coolant) in the system. The coolant flows through the water jacket passages in the engine block, intake manifold, and cylinder head. When the coolant reaches the operating temperature of the thermostat, it opens. After that, the coolant is sent to the radiator, where it cools down.
The system directs a certain amount of coolant to the heater heat exchanger.
The expansion tank is connected to the radiator to compensate for the expansion of the liquid. The expansion tank ensures the required level of coolant in the engine.
The cooling system in this vehicle does not have a radiator cap or filler neck. The fluid is added through an expansion tank.
Expansion tank
The expansion tank is a clear plastic container similar to a washer reservoir.
The expansion tank is connected to the radiator with one hose and to the cooling system with the other hose. During movement, the coolant expands. A portion of the expanded coolant leaves the radiator and engine into the expansion tank. Air that has entered the radiator and engine is also forced out into the expansion tank.
After the engine is stopped, the coolant cools and contracts. The displaced liquid returns to the radiator and engine. This helps maintain the liquid level at the required level at all times and improves the cooling quality.
Ensure the fluid level is between the MIN and MAX marks on the expansion tank when the system is cold.
Checking the expansion tank cap
1. Apply pressure to the cover from 120 to 160 KPa.
2. Wait 10 seconds and check the pressure on the leak tester installed on the cap.
If the pressure recorded by the cooling system pressure tester drops below 80 kPa, replace the expansion tank cap.
The article is reprinted from the website «CHEVYMAN.RU»