replace a head gasket on this? My mechanic who i dont trust says I have a blown head gasket and the car has only overheated once which when checked the fluid was very hot but still inside of the radiator, and the reservoir was empty. The hose at the bottom of the reservoir popped off, (which is how I saw the fluid still in the radiator, I replaced and refilled the radiator and the reservoir. I rattached the hose and drove home with no problems. The next day I had it towed and they say its a blown head gasket 3000.00 dollars. ANy help???