A Vehicle Is Being Diagnosed for Poor A/C Performance

A vehicle is being diagnosed for poor A/C performance. The engine is started, and when the system is set to MAX A/C, the compressor engages normally. When the temperature control knob is moved from hot to cool, only hot air blows out of the A/C outlets. Technician A says there is a problem with the air duct system or the controls. Technician B says the system is low on refrigerant. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Correct Answer:

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