For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Remove the automatic temperature control (ATC) Controller.
2. Turn the ignition switch to ON.
3. Turn the A/C switch to ON.
4. Measure the voltage between ground and terminal A11 on the controller.

Is the voltage measured within the specified range?

11-14 V

Go to HVAC Preliminary Checks

Go to Step 2

2 | Replace the ATC controller. Did you complete the replacement? | -- | System OK | --