My 1997 eldorado overheats after driving over short distances (15-20 miles). It has a bad coolant leak which ive taken to my mechanic and yet he cant seem to find where the leak is coming from. I've replaced the radiator, the thermostat, the radiator hoses and it still leaks BADLY! I'm having to fill the resevoir with new coolant everyday before i drive it! However I cant imagine that even this bad of a leak is causing the engine to overheat. This makes me think it could be a blown head gasket. My guy I take it into has told me a few options i could do. For starters he reccomnded using blue devil head gasket sealer to possibly stop any leaks. To me this seems like a temporary fix and i dont know how much it would benefit, or last. He told me that the way the Northstar V8 engine is put together that he'd be unable to fix the head gasket. He then tells me I could possibly do an engine swap. I just really don't know what to do. I love the car, but it is extremely impractical for me to be constantly filling with coolant and overheating the car. Could someone give any helpful advice please?