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The flaps are controlled by lever 4. If the lever is set in its upper position, air is
delivered via deflectors 13 to blow the glasses, in the lower position – to warm driv-
er’s and passengers' feet. If the lever position is changed relative to the extreme posi-
tions, the quantity of the air supplied to blow the glasses and warm the driver’s and
passengers’ feet changes correspondingly.
Interior hatch cover 7 is controlled by lever 5. If the lever is set up in its upper
position, the hatch is opened, in lower position the latch is closed.
Fig. 100. Cab Heater and Windshield Blowing Diagram:
1 – warm air supply branch pipe for windshield blowing; 2 – exterior hatch control lever; 3
– warm air distributor; 4 – warm air distributor flap control lever; 5 – interior hatch control
lever; 6 – electric motor and fan assembly; 7 – interior hatch cover; 8 – heater radiator; 9
– heater radiator water outlet pipe; 10 – water-supply pipe; 11 – cock; 12 – exterior hatch
cover; 13 – deflector
Optimum location of the heater controls is as follows: simultaneous intake of the
air from the outside through hatch adjusted by cover 12, from the cab through in-
terior hatch closed by cover 7, and supply of the heated air onto the windshields, the
driver’s and passengers’ feet by setting lever 4 in the middle position. The fan
switch is available on the dashboard.
Cock 11 mounted in the engine r.h. water pipe should be opened, when the truck
is used at negative ambient temperatures. In summer the heater should be discon-
nected from the cooling system by closing cock 11.
If water is used as a coolant at negative ambient temperatures, the heater cock
should be closed before filling in the cooling system in order not to allow cold water in
the heater radiator and to avoid its freezing.
