MIL-T-14382W
reservoir of not less than two quart capacity. A high coolant temperature red indicator warning light shall be provided on the instrument panel.
3.4.1.5 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.
3.4.1.6 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.
3.4.1.7 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 60°F) 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:
(a) 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 170°F to
195°F shall be installed
(b) Immersion type engine oil heater, 300-watt minimum rating, with 170°F to 195°F
thermostat, shall be installed in oil pan through any convenient opening
(c) Battery heater shall have a capacity adequate to maintain the battery electrolyte at a
temperature of not less than l0°F during vehicle exposure in ambient air temperatures as low as minus 60°F, and shall embody a thermostat to limit the temperature of the electrolyte to not more than 80°F
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