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ACT CH21
Term | Definition |
---|---|
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 |