Draining the coolant should be done on a cold engine.
Remove the expansion tank cap.
Place a coolant collection pan under the engine.
Figure 3.45. Location of the plugs (1) for removing air from the cooling system
Unscrew the plugs 1 (see figure 3.45) to remove air from the cooling system.
Figure 3.46. Location of the lower radiator hose (1)
Loosen the clamp and remove the hose from the lower radiator hose 1 (see figure 3.46), drain the coolant from the radiator and hose.
Figure 3.93. Location of the coolant drain plug (1) from the cylinder block
Remove drain plug 1 (figure 3.93) and drain the coolant from the cylinder block.
After draining the coolant, screw the drain plug back in.
Figure 3.47. Installation of a special container 0173/2 (1) on the expansion tank for filling the coolant
Instead of the expansion tank cap, screw in a special container 1 (see figure 3.47) 0173/2 for filling the coolant. This is necessary in order to completely fill the engine cooling system with coolant and remove air from it. If you don't have 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 air bleed plug hole. Screw on the plugs 1 (see figure 3.45).
For proper bleeding of the cooling system, a special container 1 (see figure 3.47) 0173/2 for filling the coolant must be filled to the 1 l mark.
Start the engine and let it run at 1500–2000 rpm until the second cooling cycle is complete (turning the radiator fan on and off), while maintaining the liquid level at the 1 liter mark.
Stop the engine.
Remove special container 1 (see figure 3.47) 0173/2 to fill the coolant and screw on the expansion tank cap.
Check the coolant level and top it up if necessary.
On a hot engine, the coolant level should be at the "Max" mark; on a cold engine, between the "Max" and "Min" marks.