Chapter 3 HVAC Tools, Equipment, and Service Information 59
information. Many of the phone hotline and computerized
assistance services receive these bulletins. They are a very
good source of information to repair an unusual or fre-
quently occurring problem. Subscriptions to these bulletins
are also available through various services.
Telephone Hotlines
If all other sources of information have been exhausted,
the technicians may be able to call a telephone hotline.
Some vehicle manufacturers, part suppliers, and service
Figure 3-43. If this troubleshooting chart is followed closely, it will almost always give you the correct diagnosis. (Four Seasons)