2017 x15 Coolant system pressure test. Not losing pressure after 20 minutes ??

[BrandonOlsen]

I think what was going on in my head was that I put the pressure in the system and it wouldn’t release. I was thinking when you drive and shut the truck off the pressure releases so it has to release somewhere. The difference is when driving the truck is heating up the coolant which builds pressure and shut it off it gets cold and relieves pressure. I don’t always put 2 and 2 together. I just remember watching a video that you pressurize it and wait 5 minutes to see if it drops. I just assumed after 5 minutes it would start dropping. Thanks fellas