Notes: An exchange of the "Lüfterzarge mit Lüfter" and "Kühlmittelkühler/ausgelagerten Kühlmittelkühler" may be necessary. If on the picture panel in the main group 17 there is a "Lüfterzarge mit Lüfter" and "Kühlmittelkühler/ausgelagerten Kühlmittelkühler" designated to the oe trailer tow hitch, then this part number has to be ordered and installed as well. For vehicles with sa322, the smart opener is to be deactivated; for this purpose, remove antenna with wiring set and restrain plug . Various trim panels must be replaced, refer to epc for these. (See reference picture panel) if changing the fan, consult the plate in epc for the corresponding module and power distribution box. In some engine versions it may be necessary to exchange the heat insulation. Note: the installation instructions are not included in the retrofit kit. The installation instructions shall be printed out from the epc on that day and given to the customer. For vehicles with trailer coupling preparation [S8sla (+)].