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3.4.1.4 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 an ambient air temperature of not less than
125 degrees Fahrenheit (F). The cooling system shall include a surge tank or a coolant recovery
reservoir of not less than 2-quart capacity. A high coolant temperature or low coolant level
alarm buzzer and a red indicator warning light shall be provided on the instrument panel. A
radiator servicing access door shall be provided on the instrument panel. A radiator servicing
access door shall be provided to allow verification of the coolant level.
3.4.1.5 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.
3.4.1.6 Governor. An engine governor shall be furnished and set to limit maximum
engine speed to maximum recommended operating speed. The governor shall also provide an
adjustable no-load speed setting which shall be maintained within 100 revolutions per minute
(rpm) of the selected setting during the compaction cycle.
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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.
3.4.1.8 Power plant heaters and fuel warmers. When specified (see 6.2), a coolant
heater, an engine oil heater, and for diesel engine driven vehicles a fuel warmer 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-prong (male), weatherproof, slave receptacle
for receiving external power and for grounding the vehicle. A three-wire connection cable,
25 five 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). The electrical insulation of the connecting cable shall
withstand normal operating stresses in low ambient air temperature (down to minus 60F)
without cracking or loss of dielectric capacity. All heater lead wires shall be installed without
interfering with vehicle
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