Coolant leak?

[X5DINAN]

I know, I know, another coolant leak post.....lol
My truck has been running pretty good the last 3-4 weeks now.
But I have been noticing a small puddle of coolant directly under
the center part of the cover. I have a expansion tank on order and
all other components look good (hoses, rad, valley pan....). Do you guys think it's probably the water pump on it's way out. When I last checked,
there was a bit of coolant around the water pump, but not enough to
justify the leak?
This leak is usually when the car has been sitting over night and I'll notice
it the next day before I leave for work. And this mostly happens when it's
a chilly night? Maybe because the gaskets are hardening? I don't know?
I usually have to add about a cup of coolant every 2 weeks..
"Water pump" culprit??

[mrbmwx5]

It could be any thing...Expansion tank, Water pump, bleader screw,,, best is let the engine run hot then check for the leak ,,,

[X5DINAN]

Actually when the truck's running hot, there no signs what so ever.
My expansion tank has a few pin holes and there is signs of leaking,
but not enough to create a small puddle. Plus I spilled a bit of water
on the side of where the expansion tank is and the water ran down the right bottom side of the truck.
I'm really starting to think it's the water pump?

[princemoe2m]

any updates on this? i just noticed the same thing, when the X is parked over 2 hours it starts to leak like urs :@ i even ran it for a 5 min but didnt notice any leaks or drops it only happens when its parked over 2 hrs.