Coolant Flush advice needed

[gumby6371]

hi all,
I'll be changing my suspect oil cooler in the next few days and obviously will need to flush the contaminated coolant. Had a look in the Haynes and it's pretty straight forward but it does mention a radiator flush and an engine flush.
My plan is to drain the system via the radiator drain tap, refill and bleed, run it for 24 hours with a cleaning agent then drain, refill and bleed again.
I'll run the hose through the radiator each time, will this be enough to remove all the oil or do I need to do the 'engine flush' as well?

To be honest I don't remember seeing the coolant drain plug under the engine mentioned in the Haynes, but then again I've never actually looked for it!

[martint]

Mate the 2nd drain ug is at bottom of radiator facing in towards engine. Wee plastic 90 degree screw thing. Or 180 it kinda turns on a simple thread release . Other one is above it on top o radiator. Just let some empty out & put same amount back in. No need for flushing unless it's really bad. Then bleed it with the 2 bleed valves.