The 609 license never expires.

The 609 License ensures that the technician knows how to repair the automotive air-conditioning systems.

Section 609 of_____ the federal law regulates air emissions from stationary and mobile sources contains all of the motor vehicle air-conditioning (MVAC) requirements and laws.

The_____ of the refrigerant system system is designed to allow easy transformation of the refrigerant from a liquid to a gas.

The amount of heat required to raise the temperature of 1 pound of water at 32*F (0*C) and at atmospheric pressure by 1*F would be:_____

When the pressure of a gas is raised, it's temperature:

Radiation describes the amount of heat it takes to move temperature up or down in degrees.

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

The air-conditioning hose connections are secure to the hose using special unions known as _____ that must be carefully assembled to avoid leaks.

Air conditioning systems absorb heat from a cab interior through a(n)

How do the late-model vehicles help maintain a cleaner and dust-free cab interior?

Moisture condensed on a cold_____ helps remove dirt and other air particulates

Which measurement of heat best describes the quantity of heat required to produce a change of state from a solid to a liquid or a liquid to a gas?

Heating is regulated by circulating engine coolant through an in-cab heat exchanger called a _____

Technician A says removing heat from an object or substance is simple, because cold always moves toward a warmer object. Technician B says all that is necessary for cooling is to provide an even warmer substance for cold to flow into. Who is correct?

Which of the following holds true for refrigeration systems?

The thermal expansion valve device lowers the pressure of the warm, high-pressure liquid refrigerant entering the ______

Which of these holds true for H-Valve thermal expansion valve (TXV) operation?

The coldest air temperature from the evaporator is when the blower is operated at its _______

The first step in the diagnostic process of the HVAC system is _______

Tech A states that the HVAC system is an easy system with a single principle involved in making the unit function properly. Tech B states that successful diagnosis and repair of the HVAC system requires a general step-by-step, strategy-based diagnosis process. Who is correct?

The best way to make sure the air-conditioning system is properly charged is to _________

If an air-conditioning system cannot be discharged for any reason and the state of charge needs to be determined, then you need to start your diagnosis by performance testing the air-conditioning system on the vehicle.

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:

If the low side of an air-conditioning system reads as a vacuum:

Because warm, moist air is passed through the cold evaporator, most of the moisture condenses on the surface of the evaporator and drips to the bottom of the air box.

If the HVAC evaporator housing drain tube becomes clogged with leaves or debris over time, the water will not be able to drain; it will stagnate and begin growing bacteria, creating an unpleasant odor.

The most accurate way to test the velocity of the air that is moving through the A/C system is with a(n):

Allowing sealant to be drawn into a(n) ______ can ruin it.

Electronic leak detectors for R-1234yf should meet:

Technicians servicing an MVAC system should do any of these EXCEPT:

Requirements for recovery/recycling/recharging equipment for R-1234yf refrigerant are set by SAE standard:

R-1234yf refrigerant has a global warming potential (GWP) of:

R-1234yf is a preferred refrigerant over R-134a because:

Technician A says that SAE standard J639 spells out details for system design, implementation, and service. Technician B says that SAE standard J639 specifies refrigerant fitting types and sizes for each refrigerant. Who is right?

Servicing MVAC systems on hybrid and electric vehicles requires:

Technician A says that anyone servicing MVAC systems for hire must be trained and certified. Technician B says that each piece of refrigerant handling equipment that is used to service motor vehicle air conditioners must be approved and certified. Who is right?

Which of these is a flammable refrigerant, unacceptable under SNAP as a substitute for CFC-12?

Empty disposable R-134a refrigerant containers should be:

Leak testing can be done by any of the following methods EXCEPT:

Which of the following types of testing requires an empty air-conditioning system?

When servicing the vacuum pump, you will need a drain pan for the old oil and new vacuum pump oil for the vacuum pump

Tech A states that when the air-conditioning machine displays an alert that it needs service, the local service department for the machine should be contacted. Tech B states that this alert is merely a precaution, and can be overlooked. Who is correct?

When using a micron gauge, if the pressure gauge falls from 1,300 to 1,000 instantly, the vehicle needs to:

The micron gauge should reach the boiling point of pressure within _____ minutes of turning on the vacuum pump

The typical electrical resistance for an automotive A/C compressor's electrical portion of the A/C clutch should be:

The air-conditioning system requires that the compression move the refrigerant at the correct velocity for the cooling of the passenger compartment to be at its peak efficiency

If an air-conditioning systems hoses are bolted together, _____ should be used to remove them

Anytime air-conditioning lines are loosened. The O-rings in the fittings must be reseated or there will be potential for leaks

In _____ testing, R-134a passing by the diode is broken down, thereby creating an electrical current charge; the internal mechanics of the diode use this charge to determine how much refrigerant has passed.

Types of electronic sniffers include all of the following EXCEPT:

Tech A states that when the sir conditioning machine displays an alert that it needs service, the local service department for the machine should be contacted. Tech B stated that this alert is merely a precaution, and can be overlooked. Who is correct?

Changing the vacuum pump oil regularly will extend the life of the vacuum pump and make it reach maximum vacuum quicker

Tech A states that when evacuating an air conditioning system, the vacuum should be maintained for approximately 10 minutes after the system reaches the boiling point pressure of water. Tech B states that the primary purpose of evacuating an air conditioning system is to remove any moisture from the system. Who is correct?

Tech A says that you should evacuate the system for no longer than 10 minutes. Tech B says that you should evacuate the A/C system for a minimum of 5 minutes. Who is correct?

The typical electrical resistance for an automotive A/C compressor's electrical portion of the A/C clutch should be:

An air conditioning compressor _____ may need service when noise is detected from the bearing as the engine is running

The process for removing the air conditioning condenser varies by _____.

Tech A says that when replacing A/C lines, the O-rings must always be replaced. Tech B says that if A/C lines use a spring lock, the spring lock must be replaced with a new one every time it is opened. Who is correct?