View Full Version : auxiliary water pump

12-11-2007, 07:02 PM
my 2004 x5 4.4 has a humming noise that the factory guy has indicated is the auxiliary water pump for the big block 8. It's really bad, clients riding in my car are asking what is it? it only runs when I have the heat on? Any thoughts on how to solve this noise problem. the dealer said they replace the unit once at 97K miles, but it really hasn't made a difference.