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What tools are you using to pressure test the truck. I found a coolant lead today appears to be coming from the o ring in between the lower elbow and pump.
I haven't had to test mine but I believe that there is a tool specifically for the job. Don't apply too much pressure, I think caps are like 16 lbs but I might be wrong. You may be able to borrow that tool from one of your auto parts stores that loans tools out.
