ChocolateMonster wrote on 01. Oct 2007 at 12:00:
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But how do you know that only 4 litres of the 7.9 actually drain out? Is this based on experience/knowledge of the capacity of the radiator?
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I am NOT saying this ... god knows how much drains out . ...!! but as long as it's more than 4 litres who cares ?? drain it flush it drain it until clear, drain for the last time .. add 4 litres of antifreeze, top up with water until full .. you now have 4 ltres of anti freeze in a 7.9 ltr system .. = nearly 50/50 !!
Headertank will empty and refill every time you drain ..so will be flushed along with the rest of the system.
Personally I run the engine with the heater on full hot for at least 30 minutes every fill, really runs the water around the system
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