Hey there. I was just wondering how exactly can I turn off the heat in my car from the valve.....the cable seems to be broken , either that or I need a new valve.....I'd just like to know how to switch it for now from under the hood.......and BTW, where is the cable that's supposed to turn it on and off, I can't see it from the outside....is it in w/ the hose or something? I know, I sound ignorant today....the summer's turning my brain into mush. TIA!