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[hotel21]

Some mini facelifts have both the pump next to the header tank as well as the other one at the radiator.....

[jonathanh]

Yep I've got one.  Never worked out how it is controlled because it seems to run permenantly.  Have previously unplugged it for a while and not noticed any difference either.

I can't fathom the wiring diagram in the Haynes manual but I would have guessed that when the heater is set to full cold the pump should go off - mine doesn't

[Jimbob]

Yep I've got one.  Never worked out how it is controlled because it seems to run permenantly.  Have previously unplugged it for a while and not noticed any difference either.

I can't fathom the wiring diagram in the Haynes manual but I would have guessed that when the heater is set to full cold the pump should go off - mine doesn't

May be worth checking out with tech2, Mark may well remember but my car was configured not to have it in the ecu, but it was there.  Think that meant it was always on.  having tech2 tell the car it was there resumed normal operation.

[Marks DTM Calib]

Right, time to set things straight!

This pump is an option and plays no part in the engine cooling!

What it does is circulate water through the HEATER MATRIX as part of what is called a cold weather pack to allow the cabin to heat up faster.

It plays no part in the engine cooling at all.

There is a further pump on the nearside of the radiator, this does assist circulation when the engine is off.

Within the climate panel setup there is an option to enable or disable this cold weather pack pump (it is controlled by the climate panel) and if its fitted and disabled, it runs all the time!

So be aware of this if you change the climate panel!

[MutantCav]

Maybe thats the problem, its a tourer and doesnt have climate control...yet the pump is there...and on all the time, so flattening the battery...without climate how would you enable it so its not always on?

[Marks DTM Calib]

Maybe thats the problem, its a tourer and doesnt have climate control...yet the pump is there...and on all the time, so flattening the battery...without climate how would you enable it so its not always on?

Would need to check my diagrams, but think its to do with the temp switch.....or unplug it!

[MutantCav]

Well its already unplugged But I guess as its there it would be useful to have it running properly??

[jonathanh]

Maybe thats the problem, its a tourer and doesnt have climate control...yet the pump is there...and on all the time, so flattening the battery...without climate how would you enable it so its not always on?

Would need to check my diagrams, but think its to do with the temp switch.....or unplug it!

I would have also thought that it was driven by the micro switches on the temp switches: the circuity that controls the HBV vac solenoid BUT that doesn't seem to be the case for me.... interested in the check of your diagrams

[Kevin Wood]

Within the climate panel setup there is an option to enable or disable this cold weather pack pump (it is controlled by the climate panel) and if its fitted and disabled, it runs all the time!

So be aware of this if you change the climate panel!

Interesting. So if I were to remove it to fit an LPG Vapouriser in its' place .. climate control could (and probably should) be reconfigured?

I've never noticed mine running, except if you turn off the engine and then switch on the climate, when it runs to heat the cabin using residual heat. Not bothered about losing that functionality as long as it's not necessary to get adequate circulation through the matrix when engine is running. Once a vapouriser is in the loop as well, I wonder if that'll be an issue? :-/

Suck it and see, I guess.

Kevin

[Marks DTM Calib]

Right

According to the wiring diagrams

On pre-facelift cars with or without climate, the pump is driven directly of the switched ignition feed.

On facelift cars with climate (all of them), its driven off the climate panel.

[jonathanh]

Right

According to the wiring diagrams

On pre-facelift cars with or without climate, the pump is driven directly of the switched ignition feed.

On facelift cars with climate (all of them), its driven off the climate panel.

that agrees with what I've observed: quite why VX thinks the pump is needed to run when the heater settings are fully cold and the HBV is closed is another matter but hey  I'll put it down to a VX oddity