Heating, Ventilation and Air Conditioning


Function Selection and Operation Check
This check will quickly and automatically select and operate all functions of the climate control system, in the combina-
tions and sequence shown below. It may help clarify a problem, or identify one that didn’t show up when you perform
the self-diagnosis circuit check.
Turn the FAN switch to AUTO, then push in both the MODE and AUTO buttons and hold them in while you start the
engine. The control unit will then automatically run the check in eight steps, one step every five seconds.
To stop at one of those steps, push the MODE button; to continue, push it again for each step after that.
Pushing the OFF button or turning the ignition OFF, will turn off the check.
Check the temperature, volume, and source of the air flow, and compare it to what the chart shows it should be.