Cabin Heater Coolant Pump - vehicles equipped with Auto Start-Stop (if equipped)
WARNING: This page is about a different car, the 2020 Ford F-150. 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. The PCM sends a PWM signal to control the cabin heater coolant pump. 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 Revolutions Per Minute (RPM)
- Vehicle speed