III-81
Experienced troubleshooters talk to the operator if they can, then personally verify the
symptoms of the problem whenever possible. They attempt quick fixes on the basis
of their knowledge of common system problems and causes when appropriate. They
know where components are located, and make repairs when they have a good idea
of what the problem is. They fix the cause or causes as well as the problem. They are
confident of their knowledge and ability.
Note: The best troubleshooters all know who to call when they get
stuck. They know someone who knows more than they do and
are not too proud to ask for help or suggestions when needed. The
key—understanding system function
The Key–Understanding System Function
Your complete understanding of AC and heater systems and how they work, plus
what can go wrong, is the key to troubleshooting and repair. We have talked about
components and system function before. Now let·s take a little different approach in
describing what happens when the air conditioner is turned on. In Figure 8-1 we have
used numbers on the illustration to track normal air conditioner function.
Troubleshooting & Service Procedures
Figure 8-1
An illustration of the typical
HVAC system. The numbers
follow the action when the
AC part of the system is
working properly (moving
heat out of the cab and into
the outside air).
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