Parking Heater

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Fig 1: Additional Heater And Parking Heater

Courtesy of VOLVO CARS OF NORTH AMERICA.

The start time for the heater is always programmed by selecting the desired parking function using the ring on the control stalk and entering the desired time by turning the ring and pressing the "reset" button. Direct start can also be used to start the heater.

The climate control module is activated when the engine coolant temperature (ECT) is > +20 °C. The blower fan starts and distributes the air in the passenger compartment.

Certain conditions must be met before the heater can start. These are:

Quantity of fuel >4 liters
No diagnostic trouble codes (DTCs) stored in the central electronic module that will prevent starting
Airbag not deployed.

When the conditions are met, the heater glow plug is activated for 1 minute. If the voltage has dropped below 11.5 V, the climate control module is stopped. The heater and the climate control module are stopped if the voltage falls below 11.3 V. A message indicating low battery voltage is displayed in the combined instrument panel (driver information module). These voltage values apply even if the heater is operating normally.

To minimize the risk of the fuel pump for the heater failing due to lack of use, the central electronic module sends a signal every week to the combustion preheater module to activate the pump for approximately 1 second. This takes place when the ignition is switched off.