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"Low Humming" Sound when Air-Cond on.
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<blockquote data-quote="tank34" data-source="post: 264781" data-attributes="member: 1332"><p>Hi Lee, </p><p></p><p>I will check out the ECU fan (if there is one for the E46).</p><p></p><p>Affan, the noise is a little more audible inside the cockpit, and it does pickup when you accelerate from a standstill. However, once you exceed abt 40km/h, the noise just goes away. A couple of things, when you exceed 40km/h, the louder engine noise can drown out this noise. Also, if it is fan related, the noise should not increase when I accelerate, which led me to suspect it could the alternator. However, not forgeting the noise does go away completely if I turn the airconditioner off (the engine still on and running of course).</p><p></p><p>Ken.</p></blockquote><p></p>
[QUOTE="tank34, post: 264781, member: 1332"] Hi Lee, I will check out the ECU fan (if there is one for the E46). Affan, the noise is a little more audible inside the cockpit, and it does pickup when you accelerate from a standstill. However, once you exceed abt 40km/h, the noise just goes away. A couple of things, when you exceed 40km/h, the louder engine noise can drown out this noise. Also, if it is fan related, the noise should not increase when I accelerate, which led me to suspect it could the alternator. However, not forgeting the noise does go away completely if I turn the airconditioner off (the engine still on and running of course). Ken. [/QUOTE]
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"Low Humming" Sound when Air-Cond on.
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