What device is used to measure air?

How is heat energy transferred through the movement of air?

What unit is used to measure heat energy in the United States?

What does a thermocouple measure?

How is heat energy transferred from the sun?

The accumulator, if equipped, is located between:

Which component squeezes the gas?

Where does the low pressure liquid become a gas?

In what state is the refrigerant when it exits the condenser?

What does a Thermal eXpansion Valve do?

Where would you expect to find a high pressure liquid within an AC system?

Both high-side and low-side pressures are low with the engine running and the selector set to the air-conditioning position. Technician A says that the system is under charged. Technician B says that the cooling fan could be inoperative. Which technician is correct?

Which component is located in the low pressure side of the refrigeration system?

A lack of cooling is being diagnosed. A technician discovers that the high pressure line is hot to the touch on both sides of the orifice tube. Technician A says that is normal operation for an orifice tube system. Technician B says that the orifice tube may be clogged. Which technician is correct?

Frost is observed on the line between the condenser and the receiver-drier. Technician A says that this is normal if the air conditioning were being operated on a hot and humid day. Technician B says that a restriction in the line or at the outlet of the condenser could be the cause. Which technician is correct?

The owner of a vehicle equipped with an orifice tube-type air conditioning system complains that the inside of the vehicle does not cool properly. The air conditioning compressor clutch rapidly cycles on and off whenever the air conditioning is on. Technician A says that the system is likely low on refrigerant. Technician B says that the most likely cause is an electrical short in the wiring to the air conditioning compressor clutch. Which technician is correct?

A customer states that the vehicle does not cool as well as it should. Technician A says that the system could be low on refrigerant charge. Technician B says that if the electric radiator cooling fan is not functioning, this can cause a lack of cooling inside the vehicle. Which technician is correct?

An automotive air conditioning system is being tested for a lack of cooling complaint. Both high and low side pressures are higher than normal. Technician A says that the system is low on charge. Technician B says that the system is overcharged. Which technician is correct?

A customer complained of a clear liquid leaking from underneath the vehicle on the passenger side after driving for a short time with the air conditioning on. The problem only occurs when the air conditioning is operating. Technician A says that the evaporator may be leaking. Technician B says that this may be normal condensed water formed on the cold evaporator coil. Which technician is correct?

Both the low and high side pressures are within normal ranges, yet the inside of the vehicle is not cooling. Technician A says that a partially clogged orifice tube could be the cause. Technician B says that too much refrigerant oil in the system could be the cause. Which technician is correct?

A technician is observing the pressure gauges when the engine is turned off and notices that the high side and low side pressures do not equalize as quickly as they should. Technician A says that the orifice tube may be clogged. Technician B says that the desiccant may be saturated with moisture. Which technician is correct.

A technician is observing the pressure gauges when the engine is turned off and notices that the high side and low side pressures do not equalize as quickly as they should. Technician A says that the orifice tube may be clogged. Technician B says that the desiccant may be saturated with moisture. Which technician is correct.

A customer states tat the carpet on the floor on the passenger side is wet and noticed this when the air conditioning was first being used in the spring during damp weather. Which is the most likely cause

An air conditioning performance test is being performed. All of the following should be done except:

Two technicians are discussing refrigerant oil. Technician A says that PAG oil comes in more than one viscosity and that using the wrong thickness could cause damage to the compressor. Technician B says that the refrigerant oil must be kept in a sealed container. Which technician is correct?

A vehicle is being checked for a lack of cooling concern about two months after another shop had replaced the compressor. Technician A says that debris from the old compressor could have clogged the orifice tube. Technician B says that the system could be low on charge due to a leak in the system. Which technician is correct?

On an older vehicle, the air flows from the heater (floor) and defroster (windshield) ducts all of the time regardless of the position of the heater/air conditioning mode control. Which is the most likely cause.

Technician A says that the air conditioning compressor should operate when the controls are set to the heat position. Technician B says the air conditioning compressor should operate when the controls are set to the defrost position. Which technician is correct?

Technician A says that the air conditioning compressor should operate when the controls are set to the heat position. Technician B says the air conditioning compressor should operate when the controls are set to the defrost position. Which technician is correct?

The air conditioning compressor clutch does not engage when the air conditioning mode is selected and the engine is running. Technician A says that the system may be low on refrigerant charge. Technician B says the low pressure switch may be electrically open. Which Technician is correct?

An air conditioning compressor is noisy whenever the clutch is engaged. Technician A says that the drive belt may be defective. Technician B says that the compressor may defective. Which technician is correct?

When leaving the compressor what state is the refrigerant in?

as refrigerant moves through the condenser it goes from _____ to ________