Fuel Operated Heater (FOH) Van Models Only
If the vehicle includes an FOH, it will enhance heater performance and will
reduce the amount of time it takes to warm the inside of the vehicle in cold conditions
below or equal to 39°F (4°C). The FOH is installed on the frame rail on the
driver side of the vehicle and uses diesel fuel to heat the engine coolant, which
warms up the passenger cabin air.
The FOH will turn on if all of the following conditions exist:
| • | Outside air temperature is below or equal to 39° F (4°C). |
| • | Fuel level is greater or equal to 12.5 percent of the total
fuel tank volume. |
| • | Coolant temperature is less than 167° F (75°C). |
