Draining the coolant
1. Remove the radiator cap.
2. Place a drain pan under the radiator and open the radiator drain plug (indicated by the arrow) and drain the coolant from the radiator.
3. Once the coolant has completely drained from the radiator, slide the pan under the engine drain hole. Unscrew the plug and drain the coolant from the engine.
4. In four-cylinder engines, the drain hole is located at the rear of the cylinder block (indicated by the arrow).
5. In a six-cylinder engine, drain holes are located on both sides of the cylinder block.
6. If the coolant is rusty in color, the cooling system must be flushed.
Flushing the cooling system
1. Remove the thermostat.
2. Tighten the drain plugs. Turn the cabin temperature control knob to the HOT position to flush the heater heater along with the cooling system.
3. Disconnect the upper radiator hose and flush the radiator with clean running water or a special cleaning agent. If the radiator is heavily clogged, remove the radiator and contact specialists to flush and/or repair it.
Filling with coolant
1. Install the thermostat in place and connect the cooling system hoses.
(This material is taken from a resource: TOYOTAMAN.ru)
2. Fill the radiator and expansion tank with coolant up to the lower mark.
3. Start and warm up the engine.
4. Add fluid to the radiator. Put on the radiator cap.