Engine ventilation heating
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The N55 engine is equipped with a PCV heater. The engine's PCV heating system is a special-equipment option (Option 842 Cold-climate version). Under steady-state operation at temperatures below -25 °C and during extremely short trips the positive crankcase ventilation system could potentially freeze and cause engine damage. PCV heating relies on an electric auxiliary heater that dials in temperatures of roughly 80 °C.
Switch-on conditions:
- Terminal 15 on
- Ambient temperature less than 2 °C
- Time since engine start is less than 360 seconds (time can be extended based on engine-oil temperature, coolant temperature and vehicle speed).