I was going to clean my grounds on my truck earlier and noticed a small drip of coolant coming from underneath the truck down beside the starter coming off the tranny lines. I shined a light up to see where it was coming from and there was a small wet spot upwards of where the down pipe comes. I went and looked down from top of engine to see if I could get a better look and noticed I had a set spot on the front of the motor underneath where the alternator is. I did a stealth egr delete a few months back due to a ruptured cooler and reused my blue hose. It doesnt look like the hose is leaking or atleast it doesnt look like it is leaking enough to see it so I wonder if I could have a small leak where the coolant part of the cooler goes up into the intake, maybe from the small oring on that nipple end. Anyway I dont think it is from the ruptured part of the cooler as it was plugged with pressed in plugs that have shoulders and are about 1/2" long or so plus heavily welded (was air tested as well) so Im 100% positive Im not leaking there. Plus there is no white smoke and no noticeable loss of coolant from the degas bottle. It is enough to drip though so here are a couple of pics from underneath the alternator and then one lower down on the pulleys. Anywhere else I need to be looking? Thanks.

 

Heater control valve dripping (if you have one)? Being its wet from the starter all the way around to the alt it could be coming from a few different places. Maybe some dye and a black light..

 

One factor, truck is pulled halfway into dads garage sitting on an incline front up about 3-4" higher so the rearward drip could be downhill runoff. It looks more "contained" to the area around the intake close to the alt.

 

Further inspection looks to be coming from the coolant nipple on the egr cooler. It is a small drip maybe about a minute apart but don't know how long it does it or been doing it. It may stop when engine is warmed up. Guess I should put a new oring on when I put cooler back in.