What I recommend is this. Since you can't see where it is leaking, purchase a dye from the local parts store for the cooling system. Place it in the system and run the car. After the coolant level drops, using a black light, check under the hood. The dye will glow so you can see a leak.
Let me know if that helps.
Joe
Friday, February 5th, 2010 AT 1:21 PM