Cadillac Repair: 1997 sts cadillac, bolt holes, combustion chambers

Question
my car is overheating and i replaced the thermostat, waterpump, and radiator cap. it still overheats when i drive down the road not when idiling. theres water coming out my overflow and theres no water in my oil. please help me

Answer
What you have is the common fault of engine coolant getting into the combustion chambers due to faulty head gaskets. There is a manufacturers service bulletin addressing this problem and the fix is to drill out the head bolt holes in the engine block and install heli-coils in the head bolt holes and install larger head bolts. My suggestion is to replace the engine with a REMANUFACTURED ENGINE which already has this head bolt modification.