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reservoir of not less than two quart capacity. A high coolant temperature red indicator warning
light shall be provided on the instrument panel. Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. On diesel engine driven vehicles, the control shall include partial thermostatic
control of coolant flow through the radiator and thermostatically controlled radiator shutters, or
complete thermostatic control of all coolant flow through the radiator. Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce the fan speed
automatically when the fan is not required for engine cooling. Power plant heaters and fuel warmers. When specified (see 6.2), a coolant heater, an
engine oil heater, and a fuel warmer (diesel engine driven vehicles only) shall be provided.
Unless otherwise specified (see 6.2), a battery heater shall be provided when power plant heaters
are specified. Heaters shall operate on 110-volt alternating current (ac), and shall be wired
through a junction block to a single, three-pronged (male), weatherproof slave receptacle for
receiving external power and grounding the vehicle. A three-wire connecting cable, 25 feet long,
and of adequate line capacity to supply power for all heater units simultaneously, shall be
furnished. The connecting cable shall include a matching female connector at the vehicle end
and a standard, weatherproof, three-pronged (two power plus one ground) male connector at the
other end. Electrical apparatus shall conform to Federal Motor Carrier Safety Regulation
393.77(c)(7). Electrical insulation of connecting cable shall withstand normal operating stresses
in low ambient air temperatures (down to minus 60F) without cracking or loss of dielectric
capacity. All heater lead wires shall be installed without interfering with vehicle component
operation and without loose excess wire. Provisions for stowage of the cable shall be provided in
the vehicle cab. Heaters shall be furnished as follows:
Coolant heaters, 1500-watt minimum rating, shall be installed in the engine block or in
the lower coolant inlet hose. Engine thermostat with an operating range of 170F to
195F shall be installed
Immersion type engine oil heater, 300-watt minimum rating, with 170F to 195F
thermostat, shall be installed in oil pan through any convenient opening
Battery heater shall have a capacity adequate to maintain the battery electrolyte at a
temperature of not less than l0F during vehicle exposure in ambient air temperatures as
low as minus 60F, and shall embody a thermostat to limit the temperature of the
electrolyte to not more than 80F

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