[6pack] TR6 cooling hoses

[Bob]

Hello Lists,
Spring is here. I'll be changing all the cooling hoses on my six.
I'll pull the thermostat and leave radiator cap off for draining.
Will coolent drain so heater will not drain into car?
No leaks/problems just trying to improve reliability for stop and go driving
in hot weather.
I already have green hoses and clips set.
Any and all thoughts/suggestions appreciated.
Regards,
Bob