Functional Check - HVAC System - Manual

Functional Check:

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 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 I/P 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.