Greeting, My oldest girl and I were using our marine oil pump to change the oil in the truck. We found that the coolant overflow was EMPTY! wow, I mean what the $$$$, then I open the rad cap (touched and made sure it was cold first). The rad was about 1/2 to 3/4 inch low. I topped off the rad and filled the overflow to the full line. So, do I have a leak? likely where? 07 ridgeline rtl with 3x k miles on it.