98 General notes Useful information when the air-conditioning system is switched on. These Operating Instructions describe all the models and standard and optional equipment of your vehicle that were available at the time of going to print. Country-specific differences are possible. Bear in mind that your vehicle may not be equipped with all the functions described. This also applies to safety-relevant systems and functions. Read the information on qualified specialist workshops ( Y page 30). Climate control General notes The heating or the air-conditioning system can only be operated with the engine running. To ensure optimal function, close the win- dows.
The air-conditioning system regulates the temperature and humidity of the cab and removes undesirable substances from the air. In air-recirculation mode, the fitted filter removes most dust particles and pollen from outside air or recirculated air. A blocked filter reduces the amount of air supplied to the cab. The interval for replacing the filter depends on environmental influences. It may be shorter than that indicated in the Service Booklet. Ventilate the vehicle for a brief period during warm weather. In order to cool the vehicle more rapidly, briefly switch climate control to air-recirculation mode.
This will speed up the cooling process and the desired interior tem- perature will be reached more quickly. Condensation may appear on the underside of the vehicle in cooling mode. ! Turn on the air-conditioning system at least once a month for approximately ten minutes. The refrigerant compressor may otherwise be damaged. H Environmental note Only switch on the air-conditioning system when necessary. Fuel consumption increases