Whining sound after shut down

nctalkinghead · 02-14-2007, 05:28 PM

My '05 w/25k has developed a "whining" sound after I turn off the power. I know there is some sort of device that runs prior to and after I hit the power button. I've always heard that sound, but in the past couple of months is has started this "whining" sound. I'm going in Friday for my 25k oil change, etc and wondered if I might use the group's experience to help identify this problem to the technician. Many thanks in advance!

IsrAmeriPrius · 02-14-2007, 05:52 PM

<div class='quotetop'>QUOTE(nctalkinghead @ Feb 14 2007, 02:28 PM) [snapback]390473[/snapback]</div>

Quote:

My '05 w/25k has developed a "whining" sound after I turn off the power. I know there is some sort of device that runs prior to and after I hit the power button. I've always heard that sound, but in the past couple of months is has started this "whining" sound. I'm going in Friday for my 25k oil change, etc and wondered if I might use the group's experience to help identify this problem to the technician. Many thanks in advance!
[/b]

It's the coolant transfer pump. Here is one thread where the problem has previously been discussed: Screaming coolant pump, Dealer replacing 1 of my 2 coolant pumps

nctalkinghead · 02-16-2007, 04:18 PM

ISR...see my post in this thread http://priuschat.com/index.php?showtopic=1...mp;#entry391719
My service tech laid the blame for the squeal on the low ambient temps with the ABS acuator!

jayman · 02-18-2007, 07:01 PM

When you power down the car, about a minute later there will be a soft "phwoosh" sound, then a soft rattling/clicking sound. That's the brake system purging itself and the electric boost pump building pressure again.

A whining or whirring sound is usually the coolant transfer pump. One with awful bearings will make more of a groan or howl sound.

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02-14-2007, 05:28 PM	#1
nctalkinghead Join Date: May 2005 Posts: 17 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	My '05 w/25k has developed a "whining" sound after I turn off the power. I know there is some sort of device that runs prior to and after I hit the power button. I've always heard that sound, but in the past couple of months is has started this "whining" sound. I'm going in Friday for my 25k oil change, etc and wondered if I might use the group's experience to help identify this problem to the technician. Many thanks in advance!

02-16-2007, 04:18 PM	#3
nctalkinghead Join Date: May 2005 Posts: 17 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	ISR...see my post in this thread http://priuschat.com/index.php?showtopic=1...mp;#entry391719 My service tech laid the blame for the squeal on the low ambient temps with the ABS acuator!

02-18-2007, 07:01 PM	#4
jayman Senior Member Join Date: Oct 2004 Location: Winnipeg Manitoba Posts: 11,564 My Car: 2004 Prius Model: Package: B Thanks: 35 Thanked 185 Times in 168 Posts Friends: 12	When you power down the car, about a minute later there will be a soft "phwoosh" sound, then a soft rattling/clicking sound. That's the brake system purging itself and the electric boost pump building pressure again. A whining or whirring sound is usually the coolant transfer pump. One with awful bearings will make more of a groan or howl sound.