auxiliary water pump location 4.8L

[brassii]

I have a code for auxiliary water pump, also my car has been pumping very little heat into the cabin lately, it will blow warm air when the fan is on the 4th speed but any higher then that its like it can't heat the air fast enough I am assuming these two things are related and that this is my problem

question is where is the auxiliary water pump located? I believe I saw a guide at one point for the n62 that said it was located underneath the left side air filter box but not sure if this is correct for the X. can't seem to find any DIY relating to changing this on the e70