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?

Question

Quizplus · Accepted Answer

The issue described points to a problem with the air duct system or the controls, as indicated by Technician A. The compressor engaging normally but only hot air blowing out suggests that the system can cool but is not directing the cooled air properly, rather than a lack of refrigerant.

A Vehicle Is Being Diagnosed for Poor A/C Performance