I have a 1996 Honda accord EX and I noticed that the reservoir tank seems to drop every couple of days. I have seen the tank empty as it sucks it back into the radiator as it needs it. I don’t see any noticeable leaks anywhere. I had a new radiator and hoses installed about a year ago. I just don’t know why it appears that I’m losing coolant somewhere in the system? I took the radiator cap off and let the engine run for awhile and the coolant is clear with no bubbles. As it is running, I don’t see any leaks as it would appear as dripping or drops under the car.