Deleting Auxiliary Water Pump?

[e46mpwrd]

Looking at the FSW_PSW.pdf, ZUSATZWASSERPUMPE(Auxilary water pump) to nicht_aktiv looks like the only change needed. Can any one else confirm? Gonna code it tonight. Been a year without it but like everyone else, doubt they'd code it and have it not do much.

[e46mpwrd]

Looking at the FSW_PSW.pdf, ZUSATZWASSERPUMPE(Auxilary water pump) to nicht_aktiv looks like the only change needed. Can any one else confirm? Gonna code it tonight. Been a year without it but like everyone else, doubt they'd code it and have it not do much.

I can confirm myself. This is all that is needed.

[elbert]

Bumping this thread up...

Unlike non-M cars, the cooling system on ours is self-bleeding. Does deleting this aux water pump affect this at all?

[George Hill]

I'm running it as well, coded it as described in Obioban's diy on the old forum. Works fine and clears the CSL airbox. I even snipped off the extra plug. Anyone know the other endpoints of those wires by the way? I'd like to pull them ...

Edit: One wire ends pin 6 on the plug on the back of the heating controls:

The other makes its way to fuse 62 in the glovebox, but so does the water valve wire, and they're the same colors ... and it's unclear where they join based on the wiring diagram.

The other wire (water pump B+) does go to the fuse box, it is in the same fuse location as the valve. The pump terminal goes into the fuse box and has a tab that sticks up. There is a second slot above the primary and the valve terminal goes into there and clips onto the tab. To remove it you have to completely disassemble the fuse box, remove the valve and pump terminal then reinstall the valve terminal in the lower slot.

*If you just cut the terminal off in the engine bay that wire will 100% be hot, just a fyi.

[0-60motorsports]

Very interesting but I think I won’t bother since I have no one to code it for me and I don’t want to lose all my CSL coding.

[ac427]

A bit late in the day but is the purpose of the pump change just to gain a little more space for the CSL airbox?

[Altaran]

A bit late in the day but is the purpose of the pump change just to gain a little more space for the CSL airbox?

Not really necessary for space. I did it for the weight savings.

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[Cubieman]

A bit late in the day but is the purpose of the pump change just to gain a little more space for the CSL airbox?

Potentially can leave a bit more room for the dipstick, I bent mine and it rubs on that valve a bit.

[sapote]

I'm curious of why the engineers needed to add this pump to the heater system, as the non-M cars use the belt driven pump to push coolant thru the heater core and it's more than enough. Electric pump for the heater sounds like a hassle and reliability for no reason as I understand.