Drain, flush and replacing coolant

[mikeylikesit]

Good Morning
I am getting ready to put 2169 to bed for the winter this weekend. First time prepping for winter storage, (unheated). I have a garage and car bag so will be all set.
In checking the coolant fluid yesterday, the hydrometer is giving me readings of about -10 celcius, which is nowhere near enough strength as we will have temps down to -30 over the winter.

I am going to need to drain the system flush and replace with a higher strength, 60/40, or 65/35 antifreeze to water ratio.

Is there a petcock on the SPF rad that I can drain from or is it just easier to drain by removing lower rad hose?

As I have the puke tank I assume (its highest point in the system), this is where to bleed air out?

Any tips/advice on this process....am I on the right track?

Thanks
Mike