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Heater valve comparison | by Sabrebuilder
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Heater valve comparison

When I first installed the engine I used a two port heater valve between the engine and the Sierra heater matrix. It dawned on me one day that this was a potentially a big mistake as it means the coolant doesn't circulate through the BMW M52 cylinder head when the heater valve is closed. Whilst looking for a solution on ebay I came across a VW/Audi three port valve that was similar to the two port valve I used initially.

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Taken on August 26, 2021