I have a RWD 2017 infinti q50 3.0t premium with just a jb4. I’ve been losing coolant and having my engine temperature go up for some time now. I’ve taken it in several times and passed the pressure test and internal leak test for coolant (so hopefully not a head gasket). This has me stumped because usually if it’s not one it’s the other. I’ve also changed the cap for the coolant reservoir to see if that was the issue with no luck. Does anyone have any suggestions or had a similar experience?