Auxiliary Heater

Auxiliary Heater
The system consists of a fuel operated heater unit and a fuel dosing pump.

Fuel for the heater system is taken from the vehicle fuel tank, through a fuel line attached to the fuel pump module. Fuel is drawn from the fuel tank by the dosing pump to the heater unit. In the heater unit, the fuel delivered by the fuel pump is burned and the resultant heat output is used to heat the engine coolant.

An electronic control module integrated into the heater unit controls the operation of the heater unit and the dosing pump. The climate control unit controls the operation of the re-circulation flaps on initial start up.







The auxiliary heater is located behind the left hand side of the front bumper and is accessed via the radiator splash shield.

The auxiliary heater operates in two stages. The system will only ever operate if the engine is running. The ambient temperature has to be below 10 degree C (50 degree F) and the coolant temperature has to be lower than 87 degree C (189 degree F) at the start of the journey.

The first stage will operate until the coolant temperature reaches 87 degree C (189 degree F), and it will then go to the second stage until the coolant temperature reaches 90 degree C (194 degree F). At this point the system will switch off. It will switch on again if the coolant temperature drops below 79 degree C (174 degree F).

The auxiliary heater will not operate if:
- the supply voltage is below 10.25 V
- it is in 'fault lockout'