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After run pump system
Posted: Wed Feb 17, 2010 10:09 am
by CliveH
Should I be able to hear the after run pump running after a drive?
This should kick in at 130F (54C) engine temperature, so even a modest drive would get it up to that.
On the S4, you can hear it kick in almost as soon as you turn the engine off and can distinctly hear it running for 10mins or so.
RE: After run pump system
Posted: Wed Feb 17, 2010 10:23 am
by Shoppinit
I must admit, I've never heard mine, but then I always let the engine idle until the oil temperature comes down to 90° before turning off.
On my Golf it only comes on if the engine temp is significantly higher than normal when you turn off.
RE: After run pump system
Posted: Wed Feb 17, 2010 10:30 am
by Shoppinit
The electric continued coolant circulation pump -V51- is fitted underneath the intake manifold. When the engine is switched off, it prevents coolant in the turbochargers (which are still hot) from boiling.
The Motronic current supply relay -J271- is active for 15 minutes above an engine temperature of 60 C after the engine is switched off, and also powers the continued coolant circulation relay -J151- in addition to the engine control unit. The earth supply to the relay coil comes from terminal 61 of the alternator, which conducts earth only when the engine is stopped.
The object of this circuitry is that the continued coolant circulation relay -J151- operates the electric continued coolant circulation pump -V51- for at least 15 minutes only above an engine temperature of 60 C when the engine is stopped. When the engine is running circulation is handled by the mechanical coolant pump alone.
NoteThe continued coolant circulation pump runs very quietly. Avoid background noise whilst checking the pump. Call a second mechanic to check if necessary.
I'm going to be checking mine now. I thought they came on at a much higher temp.
RE: After run pump system
Posted: Wed Feb 17, 2010 10:42 am
by CliveH
Thanks for that Shoppinit. Where did you find that?
It certainly must run very quietly - I'll lift the bonnet next time.
RE: After run pump system
Posted: Wed Feb 17, 2010 10:44 am
by Shoppinit
Elsawin
Re: RE: After run pump system
Posted: Wed Feb 17, 2010 10:44 am
by CliveH
Shoppinit wrote:
I thought they came on at a much higher temp.
I was surprised too. In the S4, the stock sensor kicks in around 100C I think, so there's a mod to fit a different sensor to activate it at a lower temperature.
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:04 am
by Shoppinit
Can't find a part number for it. Does anyone know what it is?
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:10 am
by CliveH
The sensor or the pump?
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:11 am
by Shoppinit
The pump. I know they are fragile. I need one for the golf anyway
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:23 am
by CliveH
Sorry, cant help there - not on ELSAWIN/ETKA?
Which Golf do you have, btw?
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 2:11 pm
by Shoppinit
It must be on ETKA somewhere, but can't find it for the life of me.
Golf II TD
Golfs are forever.
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 2:23 pm
by CliveH
Cool, we have a MkII Golf in the family too
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:06 pm
by CliveH
Well, I had a good listen with the bonnet up, after a 30 minute drive home from work this evening. Not a peep.
Although by no means a spirited drive, the engine was certainly well above the trigger temperature specified
Next job - check with Vagcom for faulty sensors or pump.
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:08 pm
by Shoppinit
I'm pretty sure it won't throw a code if it dies. The manual specifies disconnecting it and testing the supply voltage. Need to get at it within 15 mins, though I presume.
RE: Re: RE: After run pump system
Posted: Wed Feb 17, 2010 11:11 pm
by CliveH
Thanks for the advice - sounds like a job for the weekend...
Can anyone hear theirs running/kicking in after switch off?