What would cause the truck to lose power and the engine die while driving and not be able to start it again ?
The truck has 115,000 miles on it. Fluid levels were okay (per the owner , my grandfather that has owned the truck since 97). I Drove the truck about 40 miles. (the check engine light was on previously) The speed was 70 mph. The truck seemed to me slowing down, I coasted off of the highway, the engine was smoking. Turned the ignition off. The radiator was not hot. The smoke was coming from the engine. I coulld see a small amount of oil around the head gasket, it didn't look new. After opening the radiator ,I was able to add 1gallon of water. The temp guage didn't indicate that it ran hot.The truck never started up again. It will try but not crank up. The mechanic says the heads need to be replaced. does this sound right?