Thanks Jeff. It looks likes on a standard E34 that its used for the heating system. I wonder if that means there are 2 aux water pumps on the BiTurbo, one for the after run and one for the heater?I plugged those two BMW part numbers into RealOEM.com and the last one pointed me at the "auxiliary water pump" which is a standard E34/E32 part. I guess Alpina uses it as an after-run pump on the BT?
Right, there´s one next to the turbos which runs over 90° watertemp for a couple of minutes after engine stop and one next to the throttle body that supports the normal waterpump during normal driving circumstances..... I wonder if that means there are 2 aux water pumps on the BiTurbo, one for the after run and one for the heater?
Yes you should hear it running after shut down.Should the warer pump run if oil temp is 82? I'm not sure if my BTs pump is working.