UAZ PATRIOT Operation Manual page 117

Fig. 9.13. Engine cooling and heating system pattern:
1 — cabin heater radiator; 2 — engine; 3 — recirculating gases cooler (RGC);
4 — thermostat; 5 — control unit coolant temperature sensor; 6 — fan; 7 —
expansion tank; 8 — expansion tank plug; 9 — engine overheat sensor; 10 —
Cooling System radiator; 11 — air breather; 12 — drain plug; 13 — fan drive;
14 — pump; 15 — fluid & oil exchanger; 16 — crankcase drain plug
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 two years, purge cooling system and refill coolant.
Cooling system drain is performed via radiator drain orifices
(shut with plug 12 Fig. 9.13) and crankcase (shut with plug
16). To drain the coolant from heater 15, blow heater chamber
with compressed air by heater coolant drain hose preliminarily
disconnected from ORG 3. When draining, set additional heater
(when installed) switcher 5 (Fig. 3.7) to ON position.
In cases of emergency, e.g. coolant level drastic reduction,
fill cooling system with distilled water for a short use period. Do
not use salt water or alkali for softening of water as it corrodes
aluminum parts. Filter water before filling.
At first opportunity fully drain and purge cooling system.
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;
117