A blown head gasket will often not show with a cooling system pressure test. You need to test coolant and oil for traces of cross contamination. Exhaust gas can also be analyze. If the vehicle has a factory warranty left, take it to a Jeep dealer.My mechanic pressure tested Jeep. No leaks. Not leaking into engine. I find that it only dissipates after long rides. Not around town. It's a mystery?
The loss of coolant only occurs when I take a long drive. Then it's down about half a cup. If this continues tomorrow going to leave it at the dealership and try to get it lemon lawed. Still under dealer warranty.A blown head gasket will often not show with a cooling system pressure test. You need to test coolant and oil for traces of cross contamination. If the vehicle has a factory warranty left, take it to a Jeep dealer.