Question about the 3.7l petrol coolant bottle. Is there supposed to be a vent hole? I thought the system relied on pressure which would mean a vent would not pressurise the bottle. The right side of the tank has been completely filling when hot the reservoir is empty and there appears to be no pressure in the top rad hose. I have pulled the coolant tank coz I noticed coolant dripping and figured there was a leak. See picture attached the nipple circled in red is not blocked.
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