UAZ -374195 Operation Manual page 44

heater fan electric motors are turned on and off by switches 10 and
11 (Fig. 3.3).
Coolant temperature in the engine cooling system shall be at least
80°С to ensure normal heater operation.
Use a winter front supplied with the vehicle in case of low ambient
temperatures. The winter front is installed to the radiator grille using
screws.
Monitor coolant temperature in the engine cooling system and use
the winter front shutter to adjust it.
When draining coolant from the engine cooling system, check that
it is also drained from the heating system via plug 17 (Fig. 3.11), with
heating system valve 15 opened. This plug is accessible from beneath
the vehicle at the front.
Fig. 3.11. Engine cooling and bodyshell heating system diagram:
1 — fitting for coolant supply into the heater; 2 — electric motor w/pump; 3 — cab
heater heat exchanger; 4 — cylinder block head; 5 — throttling device heating hoses;
6 — throttling device; 7 — two-valve thermostat; 8 — radiator inlet hose; 9 — radiator
cap; 10 — coolant temperature sensor; 11 — cap; 12 — expansion tank; 13 — cab heater
radiator; 14 — "min" mark; 15 — heating system valve; 16 — pump w/impeller; 17 —
heater drain plug; 18 — connecting hose; 19 — fan; 20 — radiator; 21 — radiator drain
plug; 22 — radiator outlet hose; 23 — cylinder block; 24 — cylinder block drain cock (or
plug) (on the left engine side)
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