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and on the note of the coolant flush, i've found a couple of videos, i can see that from an m135i video I have to drop it out from the water pump underneath the car.
I can also see how to bleed the system, by holding the accelerator pedal down for 10 seconds.
But this is going to sound really stupid, how do I get 4.5 litres of coolant back in to the system? Because i haven't seen a radiator cap (which is where i'd normally put it...i'm a bit old school in that way)
Other things i've seen involve the words 'vacuum system' which sounds expensive.
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