Climate system air distribution not working
Symptom: Airflow always comes from the same vent and cannot be changed.
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Climate system air distribution not working
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9-5 M98-
LHD:
up to and including VIN 43012480
RHD:
up to and including VIN 43015355
The bushing for the air distribution damper on the driver's side can detach from the heating and ventilation unit, causing the metal shaft of the flap to come loose. If this occurs, it will no longer be possible to change the position of the damper, i.e. the airflow always comes from the same vent.
This problem may be mistaken for a fault in the air-mixing damper (heat regulation).
In the case of customer complaint the following procedure must be carried out.
Symptom description
Airflow always comes from the same vent and cannot be changed.
48 69 244 Bushing (white) (CA: 30590471)
First check if the fault is caused by the air distribution damper or the air-mixing damper (heat regulation).
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2.
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Calibrate the ACC system by holding the AUTO and OFF buttons depressed at the same time. Wait until the system has completed calibration (approx. 30 seconds).
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3.
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Set the driver and passenger side temperature to 21°C (70°F).
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4.
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Select defroster. Wait until the system has stabilised (approx. 30 seconds).
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5.
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Use your hand to check that air is flowing from the vent on top of the dashboard.
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6.
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Select panel. Check that the panel vent is open and increase fan speed. Wait until the system has stabilised (approx. 30 seconds).
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7.
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Use your hand to check that air is flowing from the panel vent.
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8.
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Repeat the check and switch off the engine.
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If the airflow can be changed, the fault may be in the air-mixing damper; see following SI:
US/CA:
854-2411
Other markets:
854-2396
If the airflow cannot be changed and continues to blow from the same vent, the fault is in the air distribution flap. Rectify the fault as follows:
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1.
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Turn the ignition switch to the ON position.
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2.
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Select defroster mode. Wait until the system has stabilised (approx. 30 seconds).
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3.
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Turn the ignition key to the OFF position. Slide the seat to its rearmost position for easier access.
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4.
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Remove the bottom of the panel on the driver's side. Check if the bushing is loose or missing. If the bushing is still in the correct position and the flange is lying against the housing then the fault can be due to the lever operation on the passenger side which is not described in this TSB.
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5.
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Remove the mixed air temperature sensor from the air vent to the front floor. On cars up to VIN 43003168 (LHD) and 43005803 (RHD), it is mounted on the side. On later cars, it is mounted in front of the air vent.
Warning
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As the air mixture temperature sensor's tip is very sharp, it can cause cuts to the fingers if it is not removed.
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6.
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If still in place, remove the old bushing. Insert a pair of flat-nose pliers through the floor vent and use it to hold the shaft in place.
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7.
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Insert a finger in the air vent and turn the flap to the defroster end position, see illustration:
LHD:
anticlockwise
RHD:
clockwise.
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8.
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Press in the metal shaft so it is forced into the lever on the passenger side.
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Note
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Take care when pressing the axle into the lever on the passenger side so that the axle is guided into its groove before the bushing on the driver's side is pressed into place. Otherwise, the lever on the passenger side may detach.
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9.
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Fit the air distribution damper bushing. The flange should rest against the housing.
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10.
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Fit the mixed air temperature sensor.
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12.
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Calibrate the ACC system by holding the AUTO and OFF buttons depressed at the same time. Wait until the system has completed calibration (approx. 30 seconds).
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13.
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Select defroster. Wait until the system has stabilised (approx. 30 seconds).
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14.
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Use your hand to check that air is flowing from the vent on top of the dashboard.
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15.
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Select panel. Check that the panel vent is open and increase fan speed. Wait until the system has stabilised (approx. 30 seconds).
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16.
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Use your hand to check that air is flowing from the panel vent.
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17.
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Select AUTO. Wait until the system has stabilised (approx. 30 seconds) and switch off the engine.
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18.
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Fit the bottom of the panel on the driver's side.
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