The 609 license never expires.

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In 1902, Michael Faraday invented and patented the first electric air-conditioner.

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Automotive air-conditioning is federally regulated by ________.

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_______ made it possible for air-conditioning systems to be used by consumers with no apparent harm, unlike the ammonia systems.

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Which of these heating/cooling systems was the first to be free of apparent harm to passengers?

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Tech A says that the EPA regulates automotive air-conditioning systems. Tech B says that EPA tests air-conditioning systems every 5 years. Who is correct?

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The heat required to change the water at its maximum temperature from a liquid to a gas is called:

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By adding a small amount of pressure to automotive refrigerant, the boiling point of the refrigerant will rise.

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The refrigerant in the A/C system must have a boiling point ______ freezing to manipulate its boiling and condensing points by changing pressure.

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_______ currents from the heated air in the passenger compartment flow over an evaporator core of refrigerant, causing a conduction of heat through the metal coils of the evaporator.

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The changing of state in liquids and gases, referred to as ________, is the basis of air-conditioning.

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________ is the process of transferring heat through matter by the movement of heat energy through solids from one particle to another.

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What is the temperature at which water boils?

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The circulatory movement that occurs in a gas or fluid with areas of differing temperatures due to the variation of the density and the action of gravity is called:

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In the automotive refrigerant system, low-pressure liquid leaves the metering device and travels into the ______ in the passenger compartment.

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Tech A says that the engine thermostat controls the flow of coolant through the heater system. Tech B says that the heater core can have engine coolant or refrigerant flowing through it, depending on whether heat or cool is commanded. Who is correct?

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What is a common coolant mixture ratio of coolant to water in the average vehicle?

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Air doors are controlled by any of these methods, EXCEPT:

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The defrost time of passenger vehicles has decreased considerably because of the air-conditioner being switched on during the defrost cycle.

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Raising the pressure of water 1 psi (7 kPa) raises the boiling point of water approximately _____°F.

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The highest blower motor fan speed uses how many resistors to achieve full blower fan speed?

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Name the part?

Normally, ______ of an electrical circuit is done by controlling "on" time compared to "off" time on the ground side of the circuit.

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When the air-conditioner is allowed to operate during the defrost cycle, the air is dried from the moisture removal occurring as air passes over the compressor before passing over the heater core.

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At what mileage increment should in-cabin air filters usually be replaced?

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Reversing the refrigerant flow through the air-conditioning system would turn your condenser core into an evaporator and provide ample heat for the passenger compartment.

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The automotive air-conditioning cycle starts with the ______.

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The oil in the automotive air-conditioning compressor is just as important as oil in an automotive engine.

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The air-conditioner is an open loop system.

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What type of compressor uses two interwoven scrolls?

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If refrigerant leaks out of the A/C system, the low-pressure switch opens to protect the system from:

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The purpose of the A/C compressor is to:

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The automotive air-conditioning system and the automotive cooling system do not share any hoses or pipes.

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The air-conditioning compressor clutch electrical winding typically has a resistance value of ________ ohms on a 12-volt DC air-conditioning compressor.

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If the resistance of the clutch windings do not match the manufacturer's specifications, the ________ should be replaced.

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Both POE and PAG oils absorb moisture.

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High pressures and low pressures can cause severe damage to air-conditioning system components.

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The A/C compressor clutch is engaged and disengaged by using:

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Compression of automotive refrigerant also raises its temperature, and hot high-pressure gas is created in the ________.

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Barrier-type air-conditioning hose is constructed with a nylon inner core to prevent moisture _______ (movement into the system) and permeation of refrigerant from the air-conditioning system.

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Technician A says that the evaporator is on the high side of the system. Technician B says that the condenser transfers heat to the atmosphere. Who is correct?

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Automotive air-conditioning service and repair technicians need to have a special license called the ________.

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The heat required to change the water at its maximum temperature from a liquid to a gas is called:

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Heat always transfers from hot objects to cold objects.

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When the compressor switches on, the suction from the compressor removes refrigerant vapor from the evaporator and _______ its pressure.

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The thermal cycle switch is a ________, temperature-controlled switch that controls the compressor clutch.

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What is the term used to describe the process of making an HVAC system perform to its maximum ability and comparing that to specifications?

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The ________ allows you to measure temperatures without opening either the cooling system or A/C system.

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Two technicians are discussing a repair on an A/C compressor clutch. Technician A says that special tools will be needed to remove and replace the compressor clutch. Technician B says that you must adjust the air gap on the clutch to ensure proper operation. Who is correct?

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After the _______ process, the air-conditioning machine will deposit any oil removed during the process into a graduated container on the machine.

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If the gauges of an air-conditioning system read low pressure on the high side, high pressure on the low side, or about equal pressures, it usually means that:

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Name the tool?

Name this part?

Name this part?

A(n) ________ of the system is carried out to verify the customer concern on an HVAC system.

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Technician A says that one advantage of an air conditioner is that the system removes water from the air. Technician B says that air conditioners are needed to remove moisture from the inside of the windshield to meet the mandated defrost time. Who is correct?

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The Clean Air Act (CAA) ________.

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The first use of air heated from ______ to warm the passenger compartment dates from the late 1920's.

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Technician A says that the technician is responsible for using properly certified equipment when servicing mobile vehicle A/C systems. Technician B says that the current fine for not complying with the EPA 609 is $37,500 per day per incident. Who is correct?

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