DIAGNOSIS AND TESTING

Diagnosis is more than just following a series of interrelated steps in order to find the solution to a specific condition. It is a way of looking at systems that are not functioning the way they should and finding out why. Also, it is knowing how the system should work, and whether it is working correctly. All good diagnosticians use the same basic procedure.

There are basic rules for diagnosis. If these rules are followed, the cause of the condition will usually be found the first time through the system.

Know the System

Diagnosis Charts

Visual Inspection

Testing A/C Performance
Electrical Schematic -- Air-Conditioning (ATX)
Electrical Schematic -- Air-Conditioning (MTX)

System Inspection -- Air-Conditioning

Symptom Chart -- Air-Conditioning

PINPOINT TEST RF: REFRIGERANT SYSTEM PRESSURES (Index)

PINPOINT TEST AC: AIR-CONDITIONING (Index)

Checking For Leaks