UAZ PATRIOT Operation Manual page 102

Fig. 9.5. Engine cooling and heating system scheme:
1 — cabin heater radiator; 2 — heater radiator connection hoses; 3 — engine;
4 — thermostat; 5 — control unit coolant temperature sensor; 6 — expansion
tank; 7 — expansion tank plug; 8 — Radiator assembly; 9 — motor fan; 10 —
discharge plug; 11 — fan; 12 — fan drive; 13 — pump; 14 — crankcase discharge
plug; 15 — additional heater motor pump
As required, check the coolant level in expansion tank 1
(Fig. 3.28), especially if an additional heater is installed. The fluid
level should be 3-4 cm above the MIN mark. Since a cooling
fluid has a high thermal expansion coefficient and its level in the
expansion tank varies significantly depending on the temperature,
check the level at the system temperature of +15-20°C.
If the cooling fluid decreases in the expansion tank within
a short period time or after moderate mileages (up to 500 km),
check the cooling system tightness and, after elimination of
leaks, add the same cooling fluid into the expansion tank.
Every three years or after every 60,000 km (depending on
which happens first) purge the cooling system and refill the
coolant.
Purge the cooling system as follows:
- fill the system with pure water, start the engine, let it work
until warmed up, shut the engine down and drain water;
- repeat the above operation.
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