I did a dumb trick that will require the expertise of the TDR members to let me know how serious (or not) it was. I purchased an antifreeze checker at the parts store, you know the little ones that have a small rubber hose on the bottom and a 1/2 inch class tube with little coloured floating balls in the tube and a rubber bulb deal on top that you squeeze to get a sample of your anit freeze out of the radiator. I dropped the darn thing in the radiator and it sunk and I did not know how to get it back. Can go anywhere to cause me grief ?? 2004 Dodge 3500 Cummins HO and 48RE auto trans. I have continued to drive my truck and it seems ok so far.