My secondary air pump blows like crazy on a cold start but I can't feel any exhaust or anything coming out of the valve thing on the cylinder head side so I'm going to look into that further..

[strike]I tried checking out my aux water pump but haven't found it yet really..
Key on and heater all the way on hot, fans on lowest, it sounds like something is running under my intake manifold toward the firewall but I don't know if I'm just hearing the blower fan from the heater..
I tried feeling for flow in the coolant hoses running to the heater core and didn't feel anything..

Where is this aux water pump located?
I'm not exactly finding a wealth of information searching on it.. Hmmm..[/strike]

Ok I found the pump, I get a voltage to it..
4V and 12V switching back and forth every 20 seconds or so.. 20sec at 4V and 10sec at 12V kinda..

I put 12V to the pump in both directions and nothing, no spark or anything like it's an open circuit..
Darn multimeter won't read resistance anymore so I dodn't get a reading on that...

So yeah it seems like the pump is shot..
Does that 4V - 12V cadence sound right?

PIERBURG 702078370

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06 3.0 X5 auto 103k - 95 M3 - 01 RS25 - 80 931