Help with a coolant leak

[70-k5]

So years prior my sister took our 2004 X5 4.4 to the dealership and they replaced the waterpump.

I had an issue and turned out to be the expansion tank, for $55 I ordered a new one online and installed it with three hoses and a screw, not quite the labor intensive project the dealership seemed to want to charge me for. I think the quote was $375?

So flash forward a year and I notice a spot under the X5 and the next day it is bigger, then it is really big and running down the street.... I deduce that it is not oil but the coolant collecting what grime is under there and initially presenting like an oil leak however once significant coolant leakage ensues the puddle clears up. Unfortunately the puddle is also getting bigger....

It will not leak while running. The expansion tank is dry. When the car is turned off it will start leaking from somwhere... It seems that the coolant is leaking onto the ground instead of being returned to the expansion tank.

I took the front cover off last night and thought I could see it coming from a weep hole way up on the front of the motor, it was impossible to see any source of leaking from the front. I'm an old school push rod V8 kind of guy, I know how to fix things I just don't know what things are on the 4.4 motor.

Any ideas or experience to offer?

Also, the pump at the front of the motor close to the ground on the passenger side, is this the power steering pump? OR does it have to do with the transmission?