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Because the heater core cools the heated coolant from the engine by transferring its heat to the cabin air, it can also act as an auxiliary radiator for the engine. If the radiator is working improperly, the operator may turn the heat on (together with the cabin blower fan placed on full speed, and with the windows opened) in the passenger ...
A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible.A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator.
Once the coolant reaches the thermostat's activation temperature, it opens, allowing water to flow through the radiator to prevent the temperature from rising higher. Once at optimum temperature, the thermostat controls the flow of engine coolant to the radiator so that the engine continues to operate at optimum temperature.
Peterbilt Motors Company is an American truck manufacturer specializing in the production of heavy-duty and medium-duty (Classes 5–7) commercial vehicles.The namesake of company founder T. A. "Al" Peterman, it was established in 1939 from the acquisition of Fageol Truck and Motor Company, and has operated as part of PACCAR since 1958.
Indirect replacement for Model 377; first Peterbilt aerodynamic conventional with "wide-body" cab Shares cab structure with Kenworth T2000; built on Peterbilt frame, 387 has different hood, roof fairing, and interior design. Produced as day cab, mid-roof sleeper, and raised-roof sleeper. 388 : 2006-2015 on-highway (Class 8)
But the main problem that soon damaged its reputation was poor quality control at the new, purpose-built Linwood plant, and an underdeveloped design that was rushed into production within three years of planning. Quality issues included the frequent failure of gearboxes and water pumps, poor engine cooling that often resulted in motors ...
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