Quote:
Originally Posted by Alpine
....... trapped air could blow the new matrix off,
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No, that's nonsense, as you say there will always be some air in it after a drain-down. These systems bleed fairly easily after a drain-down.
To drain the system I'd recommend leaving the drain bolt well alone (on the bottom of the rad) as it can snap off and possibly trash the radiator. Best way IMHO is to loosen the bottom hose clip and drain it from there. This clip is often rusty and it's not unheard of for it to rust all the way through and let go, so a good opportunity to inspect it and either oil the threads or replace it if it's at all suspect.