Freeze protection wires

[Ernest Ekberg]

On the early 80 coaches, there is a light blue wire that I assume was
for freeze protection for the pipes. Since this wiring is 22 years old,
on my coach, what alternative has anyone used to change these wires
out? it was 25 degrees going through the mountain pass this am, and I
would like to update my freeze protection pretty soon. Thanks, Ernie-
83pt40 in montana- if it get's too cold I'm heading south