Functional Check - HVAC System - Automatic

1. The following conditions indicate that the electrical circuits are functioning correctly:
^ The air conditioning blower motor operates at the appropriate speed with the control (mode) in any position except OFF. Verify that the compressor clutch also engages.
^ The blower motor will not operate in any speed with the control in the OFF position.
2. The heater-A/C control assembly (mode selector) is operating correctly when the designated outlets distribute air.

Perform the following A/C Function Tests. Preliminary Checks:
^ Inspect for temperature change when the temperature knob position is changed. On dual control systems, inspect the left side and the right side outlets when the temperature control position is changed.
^ Listen for a decrease in air noise, due to the closing of the recirculation valve, when going from MAX mode to A/C mode.
^ Inspect all of the IP outlets. Verify that the following conditions exist:
- The barrel rotates.
- The vane operates.
- The barrel and vanes hold the present position in HI blower operation.