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Is this the fuel pump running, anticipating a start? similar to how a fuel pump would run when the key is turned in a car with a traditional ignition switch?
 

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That's the electrical system in the car, nothing to do with fuel.
 

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Could be the HVAC blower running. I've got mine set to continue to run after ignition is shut off to help prevent a stinky A/C duct system.

My Car/Settings/Climate Settings/Recirculation Timer
 

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According to the dealer, it's the car's electrical system turning on, which is what I posted earlier.

But you guys can keep postulating....;)
 

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According to the dealer, it's the car's electrical system turning on, which is what I posted earlier.

But you guys can keep postulating....;)
What DWBF1 said. However, I prefer to think of it as my S60 "purring" after a brief slumber.
 

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I noticed a similar sound as well. I figured it was electrical components... listening with a careful ear, I find it coming from the front drivers side.
 

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Could be the HVAC blower running. I've got mine set to continue to run after ignition is shut off to help prevent a stinky A/C duct system.

My Car/Settings/Climate Settings/Recirculation Timer
Volvo's of the past use to do this, which I thought was a great idea, but no longer, at least in the S60. The recirculation timer only turns off recirculation mode after a certain length of time to prevent fogging or stale air. Kind of a useless feature but I'm glad I can turn that function off.
 

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I've noticed the same sound and tried to find the source. As best I can tell, it's coming from the area of the ABS modulator.

My Land Rover made a similar noise when I opened the door or popped the hood. Again, it was the the same area as the ABS modulator.

I don't think it's the brake system priming/bleeding itself or anything, but something on the nearby firewall leading one to believe that's the case. In any event, it's probably nothing to be alarmed about.
 
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