After having my radiator replaced, the coolant level in the radiator drops. When I top it off it dumps the coolant into the expansion tank but does not return to the radiator after the engine cools down. My expansion tank is now over full. I've also noticed a small leak under the overflow T coming off of the filler neck. Just so you know, I suspected the overflow hose or a faulty cap. I cut off a small piece of the hose and re attached and also put the original radiator cap back on to see if it helps before taking it back to the shop. Not overheating, and replaced the old radiator as preventative measure. PS. The shop installed a "MURRAY" radiator, which I was not 100% happy with. I've had issues with their products in the past.