Re: Faint AC whine driving me nuts! - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Faint AC whine driving me nuts!
Posted by saabdoc [Email] (more from saabdoc) on Sun, 28 Aug 2011 20:53:30
In Reply to: Faint AC whine driving me nuts!, CKAERO, Sun, 28 Aug 2011 18:42:19
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Fan speed control units can cause a humming or whine type noise. There was some service information years ago about how to determine if its the fan speed control unit or the blower motor causing the noise.
What you do is adjust the fan speed so the noise is most noticable, then switch the ignition off. According to the information, if the noise goes away instantly when the ignition is switched off, then its a faulty fan speed control unit. If you hear the noise slowly going away after the key is turned off, then its the blower motor.
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