I have a 2009 Ford Ranger 4.0. There is a water leak on the rear of the engine on the drivers side. I see fluid draining from one of the upper bolts looking from below. I assume the leak is above the bolt. When I fill the radiator the fluid drains until it reaches a certain level. I drove the truck to warm it up to see if it leaks, it did not. Any ideas? Thanks Steve

 

"Upper bolts.." ? Could you be a little more specific?
Maybe a PCV valve heating line (aluminum pipe wrapped around the PCV valve and the hose connections feeding it) is leaking and the coolant is just running down.

Miles on the odo? Are you the original owner? A previous hand may have kinked said aluminum pipe and caused a leak.

 

Could it be running down from your thermostat housing? I've had to change mine 3 times.