2001 Chevy Blazer 4X4, 127,000 miles. The radiator was replaced in March and everything seemed to be fine. Lately I have had to keep topping off the radiator. I am not sure what is going on or where this stuff is going. Checked the oil - clean and clear; hasn't overheated; no water vapor present in the exhaust; no visible leaks on the ground. I did find the overflow hose was not tight and I tightened the clamp. I am preplexed. Any ideas on where it is going??? Maybe I fixed the problem by tightening the hose clamp. . . .

 

Have a pressure test run on the cooling system and it will tell you where a leak is.

 

You could also add the dye to the coolant. it will turn any leak neon and make it easier to see.