Last Sunday I started up my FD and after a few seconds it started buzzing and the add Coolant light was on, I popped the hood and saw a little bit of coolant on the radiator. I took off the hose above that spot and tightened it up then put some water in until it was full, about 1/2 - 1 cup water. Started the car again and it was fine, took it for a little drive, then checked all the hoses to the radiator and tightened everything up. Every day now for the first time I start it up the coolant light comes on and it buzzes and i add some coolant, just about 1/2 cup and it is fine. My temps have been staying at 88celsius which is fine, and i can start the car up and drive it around for quite a bit, but after it sits for a long time it seems the coolant light comes on again. I can't see coolant leaking out anywhere, dont smell any, none is being burned in the exhaust, there is no smoke coming from anywhere. Do I need a new radiator or something? I was planning on getting a competition radiator and FMIC in a few weeks here anyways, any other ideas on what the problem might be?