Hey Flanker, you are going to have to search for the leak. First things first, make sure it isn't mixing with the oil by just checking your oil dipstick. If that is fine then you will have to look all over for this leak. Check the reservoir for the coolant and check that it isn't leaking out of any of the hoses attached to it or even the sensor on top. Next check to see if you see any leak noticeable in the location where the water pump is located. Check the radiator and its hoses and in my case I got underneath my car and the leak was coming down the rear sides of the engine. My leak was coming out of the cross over pipe. Good luck searching.