I checked my fluids this morning, and I had to put a half gallon of antifreeze in the overflow bottle. I checked for leaks as best I could (thigh high cast), and could not find any signs of leaking. I do not have access to a pressure tester until Monday, so besides a pressure test what else should I be looking for? My oil looks and smells fine and the level is right on since I put half quart to much in last time it is a little high.

The truck has been sitting in the driveway since early Jan. and there is no sign of antifreeze in the driveway.best I can figure is it was low before it got parked.