- The following conditions indicate that the electrical circuits are functioning correctly:
- The heater A/C control assembly (mode selector) is operating correctly when the designated outlets distribute air.
| • | 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. |
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. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Is the heater-A/C control display on? | -- | Go to Step 2 | Go to Step 6 |
2 |
Does the blower motor turn on and change speed? | -- | Go to Step 3 | |
3 |
Does the A/C compressor turn on and off properly when using the A/C system? Refer to Powertrain Control Module Controlled Air Conditioning Description | -- | Go to Step 4 | Go to Powertrain Control Module Controlled Air Conditioning (A/C) Circuit Diagnosis |
4 | Test each of the air flow modes by selecting the individual modes with the heater-A/C control. Does the air flow move through the proper vents for each mode? | -- | Go to Step 5 | |
5 | Turn the temperature control from full cold to full hot. Does the air temperature control operate properly ? | System OK | ||
6 | Observe the radio display. Is the radio display also inoperative? | -- | Go To Interior Lights Dimming Schematics in Lighting Systems | -- |
