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|  MIL-T-62032H
3.4.1.5 Cooling system. The cooling system shall maintain the engine coolant at a
temperature below the boiling point with the vehicle loaded to rated GVW and operated at an
altitude of 10,000 feet above sea level or in ambient air temperature of not less than 125 degrees
Fahrenheit (F). The coolant system shall include a surge tank or a coolant recovery reservoir of
not less than two-quart capacity. On tilt cab models, a radiator servicing access door shall be
provided to allow verification of the coolant level.
3.4.1.6 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. On diesel engine driven vehicles, 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.
*
3.4.1.7 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. The fan clutch shall be
asbestos free.
*
3.4.1.8 Power plant heaters and fuel warmer. 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 beater shall be provided, when power plant heaters
are specified. Heaters shall operate on 120-volt alternating current (ac), and shall be wired
through a junction block, including a fuse or circuit breaker, to a single three-pronged (male),
weatherproof, slave receptacle for receiving external power and grounding of 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. 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 600 F)
without cracking or loss of dielectric capacity. All heated lead wires shall be installed without
interfering with vehicle component operation, and without loose excess wire. A carrier for the
connecting cable shall be mounted within the cab or engine compartment and shall provide
positive cable retention during vehicle operation. Heaters shall be furnished as follows:
(a)
A coolant heater, 1500-watt minimum rating, shall be installed in the engine block
or lower coolant inlet hose. Engine thermostat with an operating range of 170 F to
195 F shall be installed
*
(b)
An oil pan heater of the permanent external surface mount, permanent in-pan
mount, or immersion type that meets the following requirements, shall be installed:
(1) Not less than 22 watts per quart heating capacity
(2) Not more than 18 watts per square inch heating capacity
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