slow coolant leak?

[gradylaw]

The coolant level in my overflow tank has dropped to 1/2 inch below the add mark over the last couple of months but I can't find any leaks. Been all over & under the truck. I smelled coolant in the cab real strong a couple of weeks ago (I'm sure it had to be me because I was driving along the coast with a sea breeze). Haven't smelled it at all since but the level keeps dropping.

I'd like to have a clue what's up before I turn the dealer loose on it.

Any ideas?









2001. 5 2500 4X4 H. O. 6spd, 15k mi. totally stock for now

 

[gradylaw]

Don't know how I wound up here! Should be on 24V. :{