Procedure 1 - Ambient Temperature below 21 °C (70 °F)

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Variable compressors (if equipped) need to see a thermal load on the system in order to create normal operating pressures.

NOTE: Proper A/C system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21 °C (70 °F). Perform the following steps to achieve normal operating pressures.

1.

Drive the vehicle or run the engine until it reaches normal operating temperature.

2.

Set the Air Conditioning (A/C) system temperature to the highest possible temperature setting with the dual function disabled (if equipped). Manually set the blower on HI. If the vehicle has a fresh air/recirc button, set it to recirculation. If the vehicle has an A/C switch or compressor on switch, set it to A/C OFF.

3.

Close all the vehicle windows and doors.

4.

Allow the vehicle to idle for 5 minutes.

5.

Confirm the cabin temperature is above 24 °C (75 °F). Set the A/C switch or compressor on switch to MAX A/C ON.

6.

Allow the vehicle to idle for 5 minutes.

7.

Turn engine off and proceed to procedure 2 - ambient temperature between 21 °C (70 °F) and 38 °C (100 °F).