Cabin Heater Coolant Pump
WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The cabin heater coolant pump is available on vehicles equipped with Auto Start-Stop feature only. The cabin heater coolant pump provides coolant to the heater core whenever the HVAC system requests heat and the vehicle is in Auto Start-Stop mode. Refer to the Owner's Literature, Unique Driving Characteristics, for full Auto Start-Stop enabling/disabling information.
The PCM sends a PWM signal to the cabin heater coolant pump based upon the:
- Auto Start-Stop mode enabled
- HVAC system temperature control setting (requesting heat)
- Ambient air temperature
- Engine coolant temperature
- Engine RPM
- Vehicle speed