I have a coolant leak on the passenger side. I can't tell where it is coming from. I can see a possible area right behind the T-stat housing. But I ran it hard down the highway, getting the boost up to 30 psi a few times, pulled over and checked that spot. There was no coolant puddling, spray, or any further evidence. Still got a drip from the bottom of the engine. The lower part of the engine around the water pump inlet is wet but I can't see the actual leak there, either. What do I need to pressure test the system? If it was the head gasket, would I definitly see coolant puddling around the bolt and flowwing down the side of the engine? I sure hope it is the water pump.
BTW, I had my wife try to find someone to pressure test it today. Cummins Rocky Mountain told her $350 "becasue it could take them up to 3 hrs to find the leak" Sure. Ah, go someplace esle sweetheart. For that price I can afford to start replacing parts. Still waiting for her call.

 

Ok. Screw the shops. I'm buying a pressure tester from Sears and checking it tonight. Any more tips on what to look for. I was thinking water pump, prepared to buy one and then I searched the forum. That's why I'm stressing about this. The other posts got me thinking head gasket.

 

Mine sprung a leak at the heater hose conections above the T-stat housing one time the clamps were loose.