Hi looking for some help i was out with my impreza terzo turbo last night with a friend and when I dropped him off he noticed a leak from under the engine when I checked it was coolant could this be a blown head gasket I put water in it when I got home and left it over night and there was no leaks this morning when I started it today and let it tick over I felt the radiator hoses the top one was warm and bottem one cold could it be the thermostat but it's puzzling me why the water was leaking plus when I open the water cap it was circulating fine then it started stopping and starting like tryin to spit it out av checked oil for milky colour there's none there's no oil mixing with the water and the temperature gauge sits perfect am scared to go drive it incase it may cause some damage