Hi! In Feb of '07 I purchased an '03 1 ton chev. It had over 100 000 miles, but I wasn't concerned as I've heard such great things about these motors. I've had 1 constant problem with it though. Since I've purchased it, it has always leaked coolant. I've sent it to the dealership, and then a few different mechanics. Nobody can figure out what is wrong with it. There are no external leaks and apparently the head gaskets are fine. I found 1 great diesel shop that fixed it for 2 months. But I have since moved to a new state and am dismayed to find that there are almost no shops that will work on this motor. I had the same problem at my previous residence and would be greatful if someone could suggest a good duramax diesel garage in the Phenix,AZ area. I love my truck and think I have gotten almost all the bugs out of it but have had it with this continuous problem and not being able to find a competent mechanic. Please help!