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ACT CH21

TermDefinition
accumulator acts as a reservoir for the refrigerant and also removes moisture from the refrigerant in the system
air conditioning system uses a refrigerant to absorb and remove hear from the passenger's compartment
ambient temperatures surrounding air temperature
compressor changes the low-pressure refrigerant gas in the system into a high-pressure gas
condenser functions like a radiator to cool the refrigerant
coolant a fluid circulated through the cooling stem that is engineered to absorb the heat from the engine block
cooling system manages heat produced by the engine
disiccant a chemical that absorbs moisture
electronic leak detector device used to check for escaping refrigerant. The detector will signal if refrigerant is discovered
evacuation occurs when the air conditioning system is held under a vacuum for at least thirty minutes to pull the water out.
evaporate phase change from liquid to gas
evaporator a system of tubes and fins located inside the passenger compartment. Air blowing over the evaporator is cooled. This cold air is directed into the passenger compartment
fan draws cool air through the radiator to maintain optimum engine temperature
fan clutch a device that allows the fan to slow to stop rotation at highway speeds
flow restrictor a fitting that allows a certain amount of liquid to pass through a small opening into a larger area
heating system heat from the coolant is used to warm the vehicle interior and defrost the windshield
hose clamps hoses are attached to the engine and radiator with hose clamps
hydrometer measures the specific gravity of liquids. In automotive applications it is used to measure the concentration of antifreeze.
overheat a condition where the engine temperature is above the normal operating range
ozone layer a blanket of ozone molecules in the earth's atmosphere. These molecules block some of the UV light from the sun
pressurized when an engine is running
radiator a series of finned tubes that function as a heat exchanger. as air passes over the fins
radiator cap seals the cooling system and allows pressure to build within a system when the engine is at operating temperature
radiator hoses create a pathway for coolant to flow between the engine and radiator
receiver/drier air conditioning system component that acts as a reservoir for the refrigerant. It removes moisture from the refrigerant. Also known as an accumulator.
refrigerant identifier a machine that determines whether the refrigerant is R-12
refrigerant lines metal tubes and rubber hoses that form airtight connections between air conditioning system components
Schrader valves an air conditioning system service fitting that is a different size from the service fitting on the high-pressure side. This prevents a mix-up in connectors
service fittings connection point where refrigerant is added to or removed from the air conditioning system
thermostat A device that regulates coolant flow and keeps engine operating temperature in the optimum range
water pump the heart of the cooling system. As the water pump pulley turns
condense when refrigerant releases heat and changes from a gas to a liquid
Created by: cvis
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