Hello all. It's been a while since I've been on here because my truck has been pretty reliable. However, today I came back from a week long vacation to find a large puddle of coolant under it. I looked and it appears to either be coming from the bottom of the water pump or a bolt from the timing cover. I'm almost leaning toward the bolt because it's only dripping down one side of the block. I'm just wondering what others think based off this picture. Anyone know if this is one of the bolts that goes into the water jacket?

 

Need to clean things off, fill the system, then pressure test it, should be able to see where it's coming from. Should be able to rent a pressure tester from you local parts store.