2.4 engine coolant loss. There isn’t a visible leak I did a combustion gas check with the radiator to see if there were gases in the cooing system. The fluid didn’t change color so I’m pretty sure the head gasket is fine. I’ve read a lot of posts about the thermostat housing is that a good chance that is the cause for my coolant loss no coolant on the ground though. I don’t have the tool to be able to put pressure on the cooling system to help find a leak so I’m just seeing people’s opinions.