Hey guys. So my buddy and his family just took a trip from Visalia, CA to Pismo Beach, CA and lost almost a gallon of coolant throughout the trip. He said that he can't see a puddle of water at all on the ground under the truck so he doesn't know if it is possibly leaking inside the motor somewhere. Have any of you had any problems with coolant leaking from your trucks and if not what do you suggest to diagnose the problem? Thanks.