The overflow tank is still bubbling with hot coolant after making sure that the radiator was okay and the thermostat is repaired, but it continues to bubble. What is the problem?
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1Hello and welcome to mechanics.stackexchange please try to elaborate more on your question in order to be more specific.– kokobillCommented Jan 17, 2019 at 8:32
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Is the system building up pressure? Is the pressure cap sealing?– Solar MikeCommented Jan 17, 2019 at 8:32
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1That is the cylinder head gasket is bad or loosened it let's the compressed mixture into the water circuit– ChebhouCommented Jan 17, 2019 at 8:55
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1 Answer
This could be a sign of a blown head gasket. This would push combustion gases into the coolant. Find a mechanic who owns a co2-testing device and have your coolant tested for traces of co2.
