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What affect does the accumulator have on the refrigerant?

Technician A says the receiver/drier is located on the low [pressure] side of the A/C system. Technician B says the accumulator is located on the low side of the system. Who is correct?

Brown dust on the AC clutch typically is an indication that the clutch may be:

 4-29 TXV SYS for test(3).jpg Refer to the figure above. Technician A says that the refrigerant at point 1 is a high pressure liquid. Technician B says  that the refrigerant at point 2 is a high pressure liquid. Who is correct?

Which of the following components is NOT part of a receiver/drier?

Technician A says that mode doors may be electrically operated. Technician B says that mode doors may be vacuum operated. Who is correct?

Tech A says that when diagnosing a problem with a fan, a digital volt-ohmmeter (DVOM) may need to be used. Tech B says that a mechanical fan with a viscous clutch cannot fail. Who is correct?

35f_gauge3.jpg What is the technician adjusting in the photo?

 4-29 TXV SYS for test(4).jpg Refer to the figure above. Technician A says that the refrigerant at point 5 is a low pressure vapor. Technician B says  that the refrigerant at point 4 is a high pressure vapor. Who is correct?

Technician A says that a bidirectional scan tool may be used to control the mode doors. Technician B says that a positive pressure is usually maintained within the passenger compartment. Who is correct?