I previously reported a radiator issue. The Caddy dealer in Yokosuka advised there is a plastic drain mechanism at the lower right area of the radiator, and that the plastic piece has deteriorated, causing the leak/release of coolant. As I stated before, the coolant flows out perfectly from a small factory-hole under the radiator. The dealer recommends replacement of the radiator, $1,700.00. Really need some assistance. Otherwise I will sell this car, with 53,000 original miles. Can the plastic be replaced without replacement of the entire radiator? Any experienced advice is appreciated.