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Discussion Starter · #1 ·
My 535i ( smaller version of the 540i v8) has losing loolant when turn on the hearter or aircon. it does not lost any coolant if i switch off the aircon/heater. I found there are a bit of coolant on the right hand side edge of the engine oil sum -near the power steering pump. but i can not identify where it is coming from!? there is no coolant on the back of the engine/ pipes. it seams all pipes are dry? the car does not lose coolant at all if i keep the heater /aircon off. where it could be?
 
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