exchange the cooler hose / colour

[paintinx]

good morning,

i have to exchange my "cooler hose".

up to now I ever used the red coolant colored fluid
but i have heard that i should use an other colored fluid
for the cooler hoses - when I refill the whole system.

which colour should I use - or ...
do i have to use the green colored fluid in the coolant and also
in the surge tank ...

I hope my question is clear in that poor english words ^^
and u have an advice

thx in advance, stephan

(sub built in 1979, 454 bb, th400)