Cabin Heater Coolant Pump - vehicles equipped with Auto Start-Stop (if equipped)
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 Revolutions Per Minute (RPM)
- Vehicle speed