Mark your intercooler resovaur (sp?) at the level of your coolant. Every week, come back and check and see if the level is falling at a fast rate.
Just in case you don't know where the resovaur is, here is a description where to find it. Sorry if you already know this info.
(If you stand looking in the engine from the front of your truck, the resovuar in right there on the left hand side. It has a see through whitish plastic sides and a black plastic top with a big round cap and should be filled with green coolant.)
