Mine was leaking pretty bad about 2 weeks ago. So over about a week period i was trying one thing at a time to no prevail. My valley was full of coolant and was leaking down the back of the block and down the bell housing. Ended up pulling the turbo, y bridge and just about everything else on top of the motor to figure it out. I inspected every single hose and couldnt see any leaks!! No hoses were damaged or anything. While i was there i bypassed the egr cooler and just ran a line from the t stat housing straight to the heater core. Put it all back together and what do you know...it doesnt leak anymore. I would guess that a clamp was loose somewhere and me taking it apart and resetting it must have fixed it. Kindq sucks i cant say exactly which one it was