What can cause too high a pressure, on the high pressure side. of the air conditioning system? A. Too much refrigerant in the air conditioning system. B. Poor air flow through engine. C. Poor air flow through the evaporator. D. Too much moisture in the air conditioning system.

The correct answer is A. Too much refrigerant in the air conditioning system.<br /><br />When there is too much refrigerant in the air conditioning system, it can cause an increase in pressure on the high-pressure side. This is because the excess refrigerant leads to a higher concentration of gas molecules, resulting in increased pressure. This can be caused by overcharging the system or a refrigerant leak that is not properly addressed.<br /><br />Option B, poor air flow through the engine, is not directly related to the pressure on the high-pressure side of the air conditioning system. Option C, poor air flow through the evaporator, can affect the overall performance of the air conditioning system but does not directly cause high pressure on the high-pressure side. Option D, too much moisture in the air conditioning system, can cause issues such as ice buildup and reduced efficiency, but it does not directly lead to high pressure on the high-pressure side.