t = peripheral.wrap("back")
cooldown = false

while (true)
do
    os.queueEvent("fakeEvent");
    os.pullEvent();
    if (t.getCoolantFilledPercentage() < 0.1 and cooldown = false)
    then
        t.scram()
    end

    if (t.getCoolantFilledPercentage() > 0.9 and cooldown = true)
        t.activate()
    end
end