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I assume it’s in the hope that the heater matrix is open, so it actually refills with coolant rather than becoming air locked as it won’t blow hot air if there isn’t coolant circulating in it.
Is there a procedure for refilling the coolant? I know it’s a 3 or 4 step process in my e46 as there’s several bleed points to stop there being air left in the system.
Not sure, why would that make a difference