This problem started after a mechanic replaced the heater core and the associated hoses. When the car was started for the first time after the work was finished it sounded great, but within five minutes the overflow tube popped off and the contents of the radiator shot out through it. The water was not hot. We ensured there was no problems with the connection to the fill bottle spout and the hose. Tightening the hose to it's limits will not hold it. The water will shoot out every time after about five minutes. Is it possible a hose is on the heater core so that pressure is going against itself?
It almost sounds like the water pump isnt working right
First question: why was the heater core replaced. Was it leaking water inside the car? Or was it replaced due to no heat inside the car. If it was replaced due to no heat inside the car, the shop you had taken it to shouldn't have replaced the heater core until they conducted tests of why there was no heat even if the customer insists on replacing the heater core. The reason why I'm asking is there's a possibility of the head gasket was leaking causing the poor circulation of the water to the heater core. If so, you may have replaced the heater core for no reason and most likely cost you a bunch of money. I live by this rule in our shop: DON'T JUST THROW PARTS AT THE CAR! You 'll end up spending way more money than you needed to.
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