(870-2489) New fault diagnosis for noise from the fan in the climate control system
Symptom: Vibration and noise from the climate control system at certain fan speeds.
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TECHNICAL SERVICE BULLETIN
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Bulletin Nbr:
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870-2489
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Date:
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Oktober 2004
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Market:
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all
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New fault diagnosis for noise from the fan in the climate control system
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Saab 9-5 M98-M04 within Vehicle Identification Number range
LHD
: W3050001-43019165
RHD
: W3050001-43500241
Vibration and noise may arise at certain fan speeds, which is most evident when the fan runs in position 3-6. The frequency of the noise does not increase with fan speed, and the symptom may sometimes disappear completely. The cause may be an internal fault in the fan control unit. The symptom may be reminiscent of faults with the ventilation fan such as cracked fan wheels or leaves in the fan which can result in the ventilation fan being replaced instead of the fan control unit. The following fault diagnosis has been developed in order to check if it is the fan control unit which is causing the noise.
In the case of customer complaint, the following fault diagnosis must be carried out.
Symptom description
Vibration and noise from the climate control system at certain fan speeds.
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1.
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Run the fan in position 3-6.
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2.
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Press the ACC panel's OFF button.
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3.
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If the noise ceases immediately then the probable cause is an internal fault in the fan control unit. Replace the fan control unit in accordance with WIS - Body - Automatic Climate Control, ACC - Adjustment/Replacement - Ventilation fan control. At the same time, check the ventilation fan for cracks in the fan wheel or leaves in the fan.
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Warranty/Time Information
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