UAZ 2001 ???-2206, Инструкция по эксплуатации

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Adjust deflection of the fan belt (Fig. 33) by turning the
alternator. Normal deflection of the belt equals 8-14 mm with
an effort of 4 kgf (39 N) applied to it.
When using water as a coolant, periodically remove from the
cooling system scale and dirt by flushing them with a fast jet of
clean water. Flush the engine separately from the radiator so that
rust, scale and sediment from the engine cooling jacket do not
clog the radiator (Fig. 34). Prior to flushing the engine, remove
the thermostat.
Drain coolant from the cooling system through two cocks. One
of them is arranged on the radiator lower reservoir, the other on
the cylinder block. When draining the coolant, remove the
radiator cap and open the cock.
When draining the coolant from the engine cooling system,
drain also the fluid from the heating system through the cock 15
(Fig. 32) located on the inlet manifold of the cab heater radiator.
Access to the cock is from the front, from below of the
automobile.
Notes.
1. On some automobiles, the engines 4178 are installed, with
feeding coolant to cylinder head completed with the pump of the
cooling system in which design the ball bearings are applied.
2 . On some automobiles, the visco coupling of the fan drive is
installed, its purpose is to reduce fuel consumption, fan noise. It also
reduces the time required for cold engine warm up and maintains the
engine efficient operating condition. Keep the outer surface of the
coupling clean.
Fig. 34. Flushing cooling system Fig. 33. Checking fan belt
tension