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Fuel Operated Heater FOH Driveline Control 4WD Driveline Control

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Fuel Operated Heater FOH Driveline Control 4WD Driveline Control

If the vehicle includes an FOH, it will enhance heater performance and will reducethe amount of time it takes to warm the inside of the vehicle in cold conditions belowor equal to 4°C (39°F). The FOH is installed on the frame rail on the driver sideof the vehicle and uses diesel fuel to heat the engine coolant, which warms up thepassenger cabin air.

The FOH will turn on if all of the following conditions exist:

Outside air temperature is below or equal to 4°C (39°F).Fuel level is greater or equal to 12.5% of the total fuel tank volume.The engine is running.Coolant temperature is less than 75°C (167°F).
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