hi fellas and ladies merry christmas ihave a question on ona problem im having with my car. i have a 1999 pontiac grandam se with the 3.4 v6 my low coolant light has been coming on and i have been losing water out of the resevoir isee no visible leak the temp gets up .i have changed the thermostat radiator hoses and antifreeze. the motor starts to shake as if pressure has built up the water then starts to come out of the overflow my question is could it possibly be the water pump. when i first bught the car the dealership had put green antifreeze in the resevoir and i didnt notice until a few days later ive had the radiator rodded out and the system flushed any help would be greatly appreciated. the car has a103000 m onit and the oil and water is not mixing and it is not smoking
i also bled the system