TSB regarding thumping in the coolant system. I made a 250 mile trip Saturday and noticed when I shut it off in the driveway, that I had this issue. I know the kits are no longer available but I am capable of fabricating. I just need a diagram or Pic from someone that already has it on their truck. There is a bypass hose teeing off the lower radiator hose going up to another point on the engine. Does this tee in to the coolant temp sensor for the gauge or the ecm? I have done all the checks to eliminate the normal suspects. TIA