| Description and Operation Coolant flows through the heater core constantly in the new heating system. The heating capacity is controlled by means of a mechanical air temperature valve. The temperature control and air distribution flaps are controlled by two operating cables. Air vent Heater core components 1 - Heater core housing (right-hand side) 3 - Heater core housing (left-hand side) Procedure in the event of poor ventilation of the vehicle interior and misting of the windshield, side windows and rear window. Vehicles, built to 15.01.99 (build code XC). Should a customer express concern about poor ventilation of the vehicle interior and misting of the windshield, side windows and rear window, the probable cause is insufficient forced air extraction in the area of the rear bumper. This should be rectified by installing a modified cover to the forced air extraction vents.
For additional information, refer to Heater Core Housing in this section.
Parts Required | Description | | Forced air extraction cover | NOTE:After reworking the vehicle as described, make sure that the customer is fully conversant with the operation of the temperature and air distribution controls, as described in the Owner's Manual. Procedure in the event of misting or icing-up, on the inside of the windshield, side windows and rear window. This is valid for vehicles, built from 08.98 (build code WP) and markets Denmark, Norway, Sweden and Finland. NOTE:First carry out ”Procedure in the event of poor ventilation of the vehicle interior and misting of the windshield, side windows and rear window" before proceeding this procedure. Should a customer express concern about poor interior ventilation and the windshield, side windows and rear window misting or icing-up, the probable cause in certain wether conditions, is snow and slush swirling up and lodging between the rear panel blocking the forced air extension vents. This should be resolved by cleaning the blockage and installing mudflaps. Parts Required | Description | | Rear mudflap kit - hatchback | | Rear mudflap kit - notchback | | Rear mudflap kit - estate | NOTE:Verification of the concern must be done in bad weather conditions because the snow and slush will melt when the temperature raises (e.g. in the workshop). If the forced air extraction vent is blocked, ice, snow and slush must be thoroughly cleared away. Mudflaps should be installed in front of the rear bumper to prevent a re-occurrence of the concern. Procedure in the event of whistling noises from the heater core housing. Should a customer concern about a whistling noise when the blower is set to level 3 or 4, this is probably due to manufacturing tolerances causing a gap between the components of the heater core housing. This should be rectified by applying additional sealing tape to the heater core housing to seal off the components.
For additional information, refer to Blower Motor in this section.
Parts Required | 
