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1

The easy thing to try is bleeding the system (as a comment suggested) in particular when the cap is off the radiator try to squeeze the upper radiator hose and you should see the level move up at the opening. Sometimes you'll see a bubble and the level will drop a bit. Other parts of the system can also have bubbles (like the cabin heater) after changing the ...


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The first thing that comes to my mind is that water pump is not circulating the coolant efficiently, which is causing localised boiling of the coolant and hence the overflowing. Revving the engine may increase circulation sufficiently to improve cooling. The other thing I thought of is that the coolant reservoir cap is not holding pressure, but presumably ...


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There are a few of possibilities - The coolant is boiling due to a lack of coolant circulation The bubbling is exhaust gas due to a faulty cylinder head gasket The expansion tank cap is not holding the correct pressure A mechanic should be able to use an exhaust gas analyser to detect exhaust gasses in the expansion tank. This will tell you if it is the ...


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