Auxilary Pump Run on..

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M69OOE
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Auxilary Pump Run on..

Post by M69OOE » Sat Oct 12, 2013 8:09 pm

Odd one this - after the car is switched off, having reached normal operating temperature, the auxiliary pump kicks in for up to 10 minutes, presumably circulating water around the engine. The fan doesn't kick in at the same time, but is working normally when the car is running.

I have replaced the pump, but the problem persists. I understand there is a relay that controls this unit, but am not sure which one it is.

Any ideas?

Martin

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jamescarruthers
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Re: Auxilary Pump Run on..

Post by jamescarruthers » Sat Oct 12, 2013 8:58 pm

Erm, I could be wrong but I think the auxiliary pump works most of the time and the fan only at a much higher temperature. So, maybe yours could be working correctly and the pump is kicking in at the lower temperature?

I hope someone is about to come along and either correct me or add some temperature figures to add to what I've just picked out of my brain but can't substantiate!
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

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M69OOE
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Joined: Thu Apr 11, 2013 10:31 pm

Re: Auxilary Pump Run on..

Post by M69OOE » Sat Oct 12, 2013 9:54 pm

Thanks James, but I'm prety sure that it shouldn't be working after the ignition is switched off :) I've never come across this problem with any other of the 480s I've had, and this is my 4th..

I say problem, but I guess it doesn't need to be, as it doesn't seem to consume much power, just makes an odd sound for about 10 minutes (or less if the bonnet is up)..

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jamescarruthers
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Re: Auxilary Pump Run on..

Post by jamescarruthers » Sat Oct 12, 2013 9:57 pm

No mate, the auxiliary pump definitely works with the ignition off. That's the whole point. You just get out if the car and go and it looks after itself to avoid hot spots in the engine.

It was probably broken in your other 480s!
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

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jamescarruthers
480 Is my middle name
Posts: 2501
Joined: Mon Jul 07, 2003 3:19 pm
Location: Cambridge

Re: Auxilary Pump Run on..

Post by jamescarruthers » Sat Oct 12, 2013 10:16 pm

Image

Image

Image

My book is just for the very early 480s (mine is 87) but the principle will be the same for all of them. The testing however, I'm not sure about. Which engine and year are you?
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

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M69OOE
480 Newbie
Posts: 27
Joined: Thu Apr 11, 2013 10:31 pm

Re: Auxilary Pump Run on..

Post by M69OOE » Sat Oct 12, 2013 10:23 pm

Thanks for the pics - very informative and helpful.

its a 1994 and 1721cc. I wonder if it is an electrical issue, as I have changed the pump (admittedly for a similarly scruffy one), with no difference to the problem.

Presuming the pump is functioning correctly from a mechanical perspective, might it be a control issue?

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glasgowjim
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Re: Auxilary Pump Run on..

Post by glasgowjim » Sat Oct 12, 2013 10:49 pm

The auxiliairy pump does switch on after the car has stopped and the ignition is turned off . That is normal. I was under the impression that this feature was discontinued after 1992 but obviously it was continued.

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jamesy12345
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Location: Durham, England

Re: Auxilary Pump Run on..

Post by jamesy12345 » Sun Oct 13, 2013 5:24 am

On my 460 the pump would run longer than the cooling fan, after the ignition was switched off. Good pics there James!
Current:
Volvo S60 '04
Renault 21 '91
Subaru Legacy '05
Mazda RX-7 '93
Renault 5 '84

Previous:
440 2 litre, 440 Turbo, 460 Turbo, 480 Turbo x2, 854 T-5R, S40 T4, V40 T4, S70 T5 & R, V70 R x2, S60 R

svenska axel
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Re: Auxilary Pump Run on..

Post by svenska axel » Tue Oct 15, 2013 12:07 pm

someone tell'd me its for cooling the injectors. they used to get heat sink on the injector rail when the car was hot and stopped, causing start troublems fuel vapour lock etc. the rail is cosy behind the engine above the exhaust manifold. the point is to disperse the heat after switch off. it was an after thought to a proble.

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jamescarruthers
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Posts: 2501
Joined: Mon Jul 07, 2003 3:19 pm
Location: Cambridge

Re: Auxilary Pump Run on..

Post by jamescarruthers » Tue Oct 15, 2013 12:09 pm

The injector cooling is separate I think (and maybe just on early turbos). I'll have a look in my book.
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

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jamesy12345
480 Veteran
Posts: 753
Joined: Tue Apr 03, 2012 5:49 am
Location: Durham, England

Re: Auxilary Pump Run on..

Post by jamesy12345 » Tue Oct 15, 2013 1:13 pm

Yes injector cooling is a different thing, only on early turbos I think.

http://www.volvo-480-europe.org/forum/v ... 11&t=33772

Some info on the operation of the aux pump....

http://www.volvo-480-europe.org/forum/v ... 0&start=20
Current:
Volvo S60 '04
Renault 21 '91
Subaru Legacy '05
Mazda RX-7 '93
Renault 5 '84

Previous:
440 2 litre, 440 Turbo, 460 Turbo, 480 Turbo x2, 854 T-5R, S40 T4, V40 T4, S70 T5 & R, V70 R x2, S60 R

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