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Coolant overflow signum 2.0t 2003


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I have a signum 2.0t 2003 recently oil cooler failed and discharged oil into cooling system,had a very good 2nd hand oil cooler installed & system flushed 3 times.

all works fine until temp gauge gets to 90c water starts to bubble and blows out of overflow oil cap clean no cream on it

any help appreciated 

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There could be a slight possibility that the head gasket could have failed as if there was high pressure in the coolant, that could have led to failure of the oil cooler...just a possibility but worth running a coolant block test (chemical changes colour if combustion gases present).

Alternatively, a more simple and cheap option may be that the coolant pressure cap has failed and not maintaining pressure in the system.

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