System Operation
WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
The heater pump improves heater performance specifically at idle conditions. It is designed to operate in either of the following 2 situations:
- Front blower motor set to maximum speed and temperature control dial (driver or passenger) set to full hot 32°C (90°F) or
- Engine coolant temperature (signal via CAN communication) minus heater core outlet temperature (intake sensor input to front air control) is greater than 20°C (68°F). If the difference is less than 16°C (61°F), the heater pump will not operate unless the conditions in item No. 1 above are met.