Climate Control Commands - A/C Request
WARNING: This page is about a different car, the 2015 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Climate control commands are inputted through the HVAC control module and on vehicles equipped with Sony ® Sound inputs can also be commanded through voice commands or the touch screen. When the A/C is requested, the HVAC control module sends the message over the MS-CAN to the BCM. The BCM sends the A/C request through the HS-CAN to the PCM.
When an A/C request is received by the PCM, the PCM engages the A/C clutch relay when all of the following conditions are met:
- the refrigerant pressure isn't excessively high or low.
- the engine coolant temperature isn't excessively high.
- the ambient air temperature is not below approximately 2 °C (35.6 °F).
- a WOT condition is not present.
- the evaporator discharge air temperature is not below approximately 2 °C (35.6 °F).