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#4068414 - 06/23/20 08:24 AM Checkout this noise after shutdown
ChrisM_NY Offline
Over the Hill

Registered: 03/01/12
Posts: 1672
Loc: Saratoga, New York
Checkout this vic on reddit - I'm really curious what the hell is this, it sounds like it almost speeds up at one point

https://www.reddit.com/r/CrownVictoria/comments/hdg6rq/does_this_sound_mean_death/
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#4068420 - 06/23/20 09:39 AM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 1212
Loc: Cleveland, OH
I'm gonna guess water pump impeller is loose and spinning after shutdown.
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1988 CVLX Formal Roof (Love Boat) POTM July 2019 53K
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1988 CVLX (Destroyer) 1998-2001 driven to death 202K
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#4068422 - 06/23/20 09:43 AM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
Prospect62 Offline
CVN 10 Year
Member

Registered: 01/15/10
Posts: 208
Loc: Central New York
That's the weirdest thing I've ever heard.

I agree, maybe the water pump? Maybe the electric fan hitting on something as it slows to a stop?

Is this your car?
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2008 CVPI Ex-Nevada Highway Patrol Unit 08-271

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#4068444 - 06/23/20 05:59 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
Psxmoe Offline

Climber

Registered: 05/20/16
Posts: 526
Loc: AZ
Wow that's just bizarre.
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2006 CVPI SAP 76,000 Miles, 520 Hours, BH1976 HD Light Harness, 3.27 Trac-Lok, BF Goodrich g-force COMP-2 235/55R17
Pima County, Arizona

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#4068452 - 06/23/20 07:22 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7084
Loc: MA
If the water pump cavity is full of coolant (as it should be), there's no way the impeller would spin that long on its own inertia.

Likewise, I can't imagine the fan actually speeding up as it slows to a stop.

This is one for the books...
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#4068466 - 06/23/20 08:14 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
ChrisM_NY Offline
Over the Hill

Registered: 03/01/12
Posts: 1672
Loc: Saratoga, New York
Thats what Im saying, this is crazy as hell, ive heard plenty of beat out 4.6s sounds like crap but this is nuts, a commenter said maybe its full of crud and its dieseling, with maybe a leaky injector? thats why I posted here maybe someone would have an idea, this is nuts, maybe some wierd electrical drain and the fan motor is getting some juice before turning off?

If anybodys got any idea, post them on reddit or here and I'll forward them to this guy
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#4068468 - 06/23/20 08:29 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
metro21 Offline
Over the Hill

Registered: 03/13/09
Posts: 1008
Loc: CA
That alternator seemed to spin a little oddly when it stopped.
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#4068474 - 06/23/20 09:08 PM Re: Checkout this noise after shutdown [Re: RF_Overlord]
bluejay_32 Offline
Poobah

Registered: 08/28/16
Posts: 7266
Loc: wny
Originally Posted By RF_Overlord
If the water pump cavity is full of coolant (as it should be), there's no way the impeller would spin that long on its own inertia.

Likewise, I can't imagine the fan actually speeding up as it slows to a stop.

This is one for the books...

There's no guarantee there's any coolant in it.

Without actually being there in person, I couldn't say, but it sounds like it's coming from the alternator or the water pump. I'd pull the belt first and see if it went away, then I'd be puling out the big screwdriver to listen.


Edited by bluejay_32 (06/23/20 09:09 PM)
Edit Reason: apostrophe
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Originally Posted By IPreferDIY
Sounds like time-wasting gossip to me.

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#4068488 - 06/23/20 10:30 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3100
Loc: Pennsylvania
The alternator is one of the 200 amp with one way clutch. It may be going but often those give a quick squeal at startup/shutdown & sometimes shifts. This almost sounds like something has play that shouldn't. So it is able to "slap around" as the components slow down. Do you have any issues with your temp or ac being erratic at all? I would say buy or rent one of those automotive stethoscopes. Then you can see which component or if a pulley/bearing is bad.
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#4068578 - 06/24/20 05:58 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
BigMerc96 Online   confused

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19695
Loc: I can see Detroit from here!
I was going to say alternator decoupler pulley, but you can see the alternator internals appear to stop long before the noise does. Next suspect would be a broken fan, I've seen fans with broken blades and they often maky a racket on spin-up or spin-down. I just can't see the water pump impeller having enough inertia to carry on for that long.
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2006 Audi A6 ~132k miles, stock.
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#4068612 - 06/25/20 06:12 AM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
2011LX Offline
Over the Hill

Registered: 08/31/13
Posts: 1296
Loc: Oak Creek, WI
Sounds like the rad fan, to me.
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#4068938 - 06/27/20 09:00 PM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
Johnson Offline
n00b

Registered: 04/08/11
Posts: 22
Loc: North Cackalacky
I would take the drive belt off, start the car, then shut off. If noise is gone, that would eliminate water pump, and alternator. If noise is still there, I suspect fan shroud is contacting something. I agree with above poster, I don't see how water pump impeller broken or not could continue to spin for that long or be that loud.

Take the belt off and see what happens. Easy cheap free

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#4069060 - 06/29/20 08:38 AM Re: Checkout this noise after shutdown [Re: ChrisM_NY]
GM_Guy Offline
Posting Addict

Registered: 12/17/00
Posts: 18357
Loc: London, Ontario Canada
First thing that popped into my mind hearing that is an a/c compressor clanking. Does your a/c work?

Alex.
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