Ok, I'm a little reluctant to ask, but

Wondering about radiator, block, heater, etc flush.
Had radiator work done, just over 2 years ago and guy gave system a really good clean.
A few months latter, did cam belt, water pump etc.
Done about 15K since cam belt, does system need flush, etc yet?
Had tested and said was good down to about minus 15.
Thanks.

its good for routine flushing if changing the coolant.
will pick up any dirt but also neutralises any acidic coolant or oil residue.

just make sure you flush it all out afterwards

Ok, about about how often?
Had two quotes, one around $60 and second $80 and I said I wanted 50/50, is that right?
We have a 1999 Oddy with about 210K on it.
Just had quite a bit of work done, so reluctant to do, unless really needed.

Personally wouldn't bother unless you feel there's a need. Yes it's good preventative maintenance but after work you had done shouldn't need it. Have a look when cold at coolant, if it's nice and clean I'd leave it if you're reluctant to spend money on it right now.
Never miss and oil change though.

OR you can do yourself real easy. Auto shop will sell you flush and coolant mix. Instructions on flush bottle. Can't say where drain is on your ode but Google it and should come up. Just do it outside where there good run off I case you spill any! I don't bother jacking car up to it, just need a wide flat container to catch stuff coming out of drain.
Also Google procedure for putting in new colant, some cars have a bleed screw to let air out.

Hi Tim and thanks for advise.
Yes it is a nice, bright clean colour and like I said, I had it test. Minus 15 sounds okay, to me.
I used to do all the work on the car.

I did over 25 years of Post Office/Telecom and that Post Office had some great training.
But, health wise, I can't even change a tire, so we have break down insurance.
Wife and I was talking about it and thinking to leave for a few months, gota few other little jobs to do, like sway bar bushes, before next WOF in 5 1/2 month and a few little things that I should be able to do, but can't.
Ian