System Description
WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Component Parts
Heater pump control system components are:
- A/C auto amp.
- Heater pump relay
- Heater pump
- Intake sensor
System Operation
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 A/C auto amp.) 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.