Draining coolant OM642 - rotating valve 90deg but no coolant being released?

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Ah, got you. Eventually. Apologies.

I was a bit confused as per my earlier post I'd read that not flushing with clean water was the best option.
I guess then if 'topping off', the pre-mixed coolant is best.
But if you've done a flush with water, add half the coolant volume with concentrate, then top up with water to achieve the 1:1 ratio.
Sorry, I was being a bit thick but thank you for persevering 👍
 

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