Car encyclopedia

Air Conditioning Diagnosis

When the air conditioning system is malfunctioning, it can exhibit one or more symptoms such as a lack of cold air, only cooling the front area or one side of the vehicle, and/or not blowing cold air from the panel vents. When these types of symptoms occur, it is important to have an Air Conditioning Diagnosis. 

An Air Conditioning Diagnosis involves special computer system scan tools, specialized A/C pressure testing equipment, specialized technician training, and even licensing in many states. Merely adding refrigerant to a poorly performing air conditioning system, without an Air Conditioning System Diagnosis, will do little to repair the problem and may even damage expensive A/C components.

The purpose of this article is to provide an outline for some of the essential steps involved in performing an Air Conditioning Diagnosis. This guide can be used—by you and the shop—to track the progress as the mechanics perform the test.

Air Conditioning Diagnostic Check Sheet-1

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