Hi, just got back from two weeks on the road camping below the Mason Dixon Line and it was hot and humid. But that's is not what you asked for.
I do not own a Ford and I do not live in CA., but I thought these two sites might be able to help you.
http://www.thedieselgarage.com/forums/ http://www.dieselbombers.com/
I am a member of them and others diesel sites and the members always seem to help.
Good luck with the truck.
Jim