I have an 01 D max and Im losing coolant externally just above the lower radiator hose by the rngine. It appears there is a manafold of some type which supplies coolant to the back of the engine...WTF. GM really screwed this engine up. Bring back the 6.5 and beef it up. Anyway, what is the (thing) called that distributs the coolant? I want to replace the seal so it wil stop leaking. Can any one help. tinderbox427@hotmail.com