UAZ PICKUP - Page 133

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At the ambient air temperature minus 40 °С use the low freeze
point uid TOSOL-A40M, OG-40 Lena or OG-40 TOSOL-TC.
The cooling uid operating temperature shall be within
80–110 °С. Short-time (maximum of 5 minutes) engine run is
allowed at cooling uid temperature up to 120 °С.
When the cooling uid overheat warning lamp turns on,
you must immediately identify and eliminate the cause of
overheating.
As required, check the coolant level in expansion tank 1
(Fig. 3.40), especially if an additional heater is installed. The uid
level should be between the “min” and “max” markings. Since a
cooling uid has a high thermal expansion coefcient and its level in
the expansion tank varies signicantly depending on the temperature,
check the level at the system temperature of plus 15–20 °С.
If the cooling uid 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 uid into the expansion tank.
Every three years or after every 60,000 km (depending on which
happens rst) purge the cooling system and rell the coolant.
Purge the cooling system as follows:
– ll 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.
It is impossible to ll the system completely with the neces-
sary coolant volume without engine launch due to the existence
of air in the interior heaters and connecting hoses. Fill the system
as follows:
– set the additional heater (if installed) switch 7 (Fig. 3.11) to
the ON position;
– ll the cooling system with a coolant via an expansion tank
inlet 3–4 cm beyond the MIN mark;
– start the engine, add the cooling uid to the cooler upper tank
when its level decreases;