Heating and Air Conditioning Final Already Graded A+

Heating and Air Conditioning Final Already Graded A+ Both high-side pressures 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 undercharged. Technician B says the cooling fan could be inoperative. Which technician is correct? A. Technician A only B. Technician B only C. Both technicians A and B D. Neither technicians A nor B ️Technician A only Technician A says that some expansion valves can be tested using a CO2 fire extinguisher to check if the cold will cause the valve to close. Technician B says that the operation of the orifice tube can be tested using a CO2 fire extinguisher to cool the orifice tube and watching for a drop in low-side pressure. Which technician is correct? A. Technician A only B. Technician B only C. Both technicians A and B D. Neither technicians A nor B ️Technician A only 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? A. Technician A only B. Technician B only C. Both technicians A and B D. Neither technicians A nor B ️Neither technicians A nor B 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? A. Technician A only B. Technician B only C. Both technicians A and B D. Neither technicians A nor B ️Technician B only The discharge air temperature is warm. The pressure gauges shown represent which most likely cause? A. Low on refrigerant B. Lack of airflow through the condenser C. Defective compressor D. Icing of the evaporator ️Low on refrigerant The airflow from the vents slow down after the vehicle has been driven for a while. The pressure gauges shown represent which most likely cause? A. Low on refrigerant B. Lack of airflow through the condenser C. Defective compressor D. Icing of the evaporator ️Icing of the evaporator The discharge air temperature is warm. The pressure gauges shown represent which most likely cause? A. Overcharged with refrigerant B. Restricted liquid line or low on refrigerant C. Lack of airflow through the condenser D. Defective compressor ️Restricted liquid line or low on refrigerant The discharge air temperature is cool with higher than normal low-side pressure along with excess high side pressure. Which represents the most likely cause? A. Low on refrigerant B. Clogged condensate drain C. Excess refrigerant in the system D. Lack of airflow through the condenser ️Excess refrigerant in the system The discharge air temperature is warm or slightly cool. The pressure gauges shown represent which most likely cause? A. Low on refrigerant B. Defective compressor C. Excess refrigerant in the system D. Lack of airflow through the condenser ️Lack of airflow through the condenser 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