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The humming sound is the fuel pump. this is normal the sound is the air compressor for the ELC (Electroinc level control) it pumps air into the rear struts the level the car out when you turn on the key.

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Q: What is that humming sound in the back off a 1998 park ave when you start your car up The sound is not loud but you can hear it and it last for about 10 sec.?
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