General information
The cooling system includes a crankshaft belt driven water pump, electrically driven radiator fan, radiator, expansion tank, heater thermostat and radiator, hoses and switches. 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 a quick warm-up of a cold engine. When the coolant reaches a certain temperature, the thermostat valve opens and the hot coolant flows through the hose to the radiator and is cooled by oncoming airflow.
Attention! When opening the expansion tank cap on a hot engine, care must be taken, as escaping vapors can cause severe burns. To do this, close the cap of the expansion tank with a thick layer of cloth and slowly unscrew the cap until a hissing sound is heard. After the hiss stops, slowly unscrew and remove the cap from the expansion tank. Do not allow coolant to come into contact with clothing or body paintwork. Otherwise, rinse the surface with plenty of water. Replace all clamps and clamps that are damaged or cut during disassembly of the cooling system with new ones during assembly. Collect the drained coolant and dispose of it.
Coolant replacement
It is necessary to replace the coolant after carrying out any work on the elements of the cooling system with draining the coolant. If during the repair the cylinder head, head gaskets, radiator or oil heat exchanger were replaced, fresh coolant must be poured into the cooling system. This is due to the fact that the anti-corrosion additive in the coolant is deposited during engine operation and creates anti-corrosion protection. In used coolant, anti-corrosion additives are less active in order to form a protective layer on newly installed parts.
Drain the coolant on a cold engine.
Remove the expansion tank cap.
Install a coolant collection pan under the engine.
Pic. 3.45. Location of plugs (1) removal of air from the cooling system
Unscrew plugs 1 (pic. 3.45) to remove air from the cooling system.
Pic. 3.46. Location of the bottom pipe (1) radiator
Loosen the clamp, remove the hose from the lower radiator pipe 1 (pic. 3.46) and drain the coolant from the radiator and hose.
If the coolant is heavily contaminated, flush the cooling system. Since the coolant cannot be completely drained from the cooling system, it is recommended to flush the cooling system each time the coolant is drained.
Pic. 3.47. Mounting on a special expansion tank 0173/2 (1) for filling coolant
Instead of the cap of the expansion tank, screw in a special container 1 (pic. 3.47) 0173/2 for filling coolant. This is necessary in order to completely fill the engine cooling system with coolant and remove air from it. In the absence of a special container, you can make it yourself.
Slowly pour BASF GLYSANTIN G33-23F or GUTIT ESSEX REVKOGEL 2000 coolant into the cooling system.
Pour coolant into the expansion tank until it flows out through the hole for the bleed plugs. Screw on caps 1 (see fig. 3.45).
For proper bleeding of the cooling system, a special container 1 (see fig. 3.47) 0173/2 to fill the coolant must be filled up to the 1 liter mark.
Start the engine and let it run at a speed of 1500-2000 min-1 until the end of the second cooling cycle (turning on/off the radiator fan), while maintaining the fluid level at 1 liter.
Stop the engine.
Remove special container 1 (see fig. 3.47) 0173/2 to fill the coolant and screw on the expansion tank cap.
Check the coolant level and top up if necessary.
On a hot engine, the coolant level should be at the mark «Max», on a cold engine - between the marks «Max» And «Min».