Operation - Fuel Heater 1
WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The fuel heater is used to prevent diesel fuel from waxing during cold weather operation.
When the fuel temperature is below 32° F (0° C), the temperature sensor allows current to flow to the heater element warming the fuel. When the fuel temperature is above 64° F (18° C), the sensor stops current flow to the heater element.
Battery voltage to operate the fuel heater element is supplied from the ignition switch and through a relay the PDC. The fuel heater element and "relay in PDC" are not computer controlled. The heater element operates on 12 volts, 300 watts at 0° F (-18° C).