Faint hum

[Galion]

Originally Posted by jpl

I had something similar
they found it was the secondary pump, of some sort, under the dash on drive side, it came, and then it left, it was sitting on weak rubber bushing, which they replaced, now its silent.... the noise looked like it came true the vent

The e-box fan is located on the passanger side. Humming noise when a/c is on comes clearly from drivers side.
Can someone tell me what is the secondary pump?
Thanks

[Radu292002]

hi,

Wasserschlauche/Wasserventil BMW X5 E70, X5 3.0d (M57N2) ? BMW Teilekatalog

number 1 ...
it is a pump which helps the cooling and heating system
i heard about changing the pump, or only the bracket that holds it....by some X5 owners was it a solution by other the same noise!!
i also have it, i am out of warranty...and do not want to spend money on a new pump which should work properly after 2 years ...instead it makes that annoyong noise i will hang myself if i hear it again...

i want to take it out with a friend to see exactly how it looks...
bye

[Galion]

Just an update for this thread,
As stated in earlier posts, the faint hum comming from the climate control that drove me nuts for a while was the secondary pump.
Dealer replaced it at no cost, even though my car was out of warranty.

[Armand]

Ditto here. MY '10 35d. Faint hum - constant pitch and loudness when you turn on the fan. dealer replaced aux water pump. Problem fixed. Work order states:
1 64-11-9-197-085 ADDITIONAL WATER PUMP: 641030