So I have a 2017 Chevy 2500. With the L5P duramax and 49k miles. I have been losing coolant periodically. So I add it here and there when the overflow tank gets low and I get a “low coolant message”. I notice a small puddle of coolant under the truck more towards the passenger side. So I then popped the hood and noticed my coolant overflow tank was under pressure when I starting unscrewing it. The next day I did all the at home tests for a blown head gasket… but everything seemed okay. The upper rad hose wasn’t as hard as a tennis ball. And I have no coolant in oil and vise versa….so the next day I decided to unscrew the coolant cap so no pressure could build. I drove the truck to operating temp and parked. The next morning I noticed another puddle under my truck.. but there was no pressure on the coolant system to force it out of the overflow…. So any suggestions are appreciated.