Quote:
Originally Posted by Cookeh
eBay for the Behr matrix, or [ur
Its not essential to drain your coolant but it is advisable. It's not a hard thing to do either, just undo the drain bolt with a suitable drain pan beneath it and the expansion tank off. Don't necessarily even need to jack the car up.
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when you say undo the drain bolt, do you mean under the radiator or the engine block?
As I understand it, if I don't drain the system the danger is that trapped air could blow the new matrix off, but isn't that always a risk as when I re-fill with new coolant I would still have pockets of air?