1. Over time, the system may lose its effectiveness due to the radiator becoming clogged with rust, scale, sediment, etc. This is one of the reasons why the engine of older cars overheats more often than new ones. To restore the efficiency of the system, it must be flushed. Drain the coolant (see previous section) and remove the thermostat (see section 8). Temporarily reinstall the thermostat housing and connect the hose. Disconnect the upper hose from the radiator and cover the engine with a plastic sheet to prevent it from getting wet while flushing the system.
2. Using a garden hose, flush the radiator until clean water comes out of it. If the radiator is heavily contaminated, disconnect its lower hose and direct the flow to the lower part of the radiator (backwash). Repeat this procedure on the cylinder block. If it seems to you that even after backwashing the radiator is not sufficiently cleaned, it should be removed (see section 7) and rinse with shaking. After backwashing, you should flush the radiator again in the normal direction and only then install the thermostat and connect the system hoses.
3. In extreme cases, it may be necessary to use special descaling compounds (Holts Radflush or Holts Speedflush). When working with them, strictly follow the manufacturer's instructions.
4. Because The coolant is never completely drained; the system should be flushed every time the coolant is changed.
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