Has anyone had any issues with their truck using antifreeze? My truck is consistently losing antifreeze but it doesn't leave a puddle, and after a thorough inspection, I can't seem to find any evidence of a leak under the hood (though admitedly it isn't easy to see in the crowded 4.6 engine bay). Couple of other points of interest: I can smell antifreeze outside of the truck and through the air vents after the truck warms up. No white smoke, or any indication of a head gasket being blown. Any ideas??