Another would be a blown head gasket .. but since we had two incidents of
bad water pump as shown posted on here last week, suggest you follow that
Reasoning is that there is not sufficient waterflow to cool 'hot-spots'
in the engine and there is local 'boiling' though the overall temp might
Another possible symptom of eroded WP is low heater output... but that
cant be relied on to define the cause.
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