The following operations should be carried out regularly during the maintenance services:
Start the vehicle engine.
Switch temperature regulating switch on and set to a medium temperature.
Pull heater flap lever back fully. Warning lamp in the knob of the heater regulating switch must light up.
After about two minutes, check whether warm air flows from warm air vents equally on both sides in vehicle interior. Turn heating off. To do this, push heater flap lever forward until warning lamp goes out. As soon as the lamp has gone out, check that the blowers at the engine cooling air intake and in the heater continue to run for 120-240 seconds, to cool the heater and purge the combustion chamber.
If the heater booster is not used over a long period, (during the summer for example), gummy deposits from the fuel may form in the fuel lines. Operational defects that could be caused by this can be avoided if the heating is switched on briefly with the vehicle engine cold about once a month during the summer. If, after about two minutes, the heating does not start to operate, the fuel in the pressure line between fuel pump and heater has probably evaporated. The time taken for the fuel pump to pump fuel into the combustion chamber in this case and for the fuel to ignite is too long and the safety switch has cut in. The temperature regulating switch must be switched off. After five minutes, operate the lever on the safety switch in the engine compartment, then switch heater booster on again. If the heater booster still does not operate, there is a defect in the heating system.
Heat output, infinitely variable: 1000-3400 kcal/h
Fuel Consumption: 0.2-0.6 liter/h (0.42-1.3 US pint/h)
Nominal Voltage: 12 Volts
Current Input: 130 Watts