I'm new to this site so I hope I'm doing this right. I have a 2004 F350 with the 6.0. I've just started smelling antifreeze when I'm pulling my camper. I can't find the leak and it's a very small leak for the most part. I did use a quater of a gallon on a 250 mile trip, very hilly and a heavy side wind. My question is, can you add air pressure to this tye of system to check for leaks and if yes, HOW?