The cable that pulls the heat flapper open broke off, is there a tech article on how to replace those, may as well do both, if one broke the other is probably not far behind.
Ian Stott
Moncton
Canada
It is a one piece wire that runs to both flapper boxes. There is 3 different cables though. One for the -6, and early and(75-76) late ones for the -4. Order new cable according to year. With that said, I believe one or more is NLA.
The replacement is pretty easy to replace once you have a new cable. Once the heater handle is removed ( tewo bolts) and pulled out of the tunnel, the wire will follow. If the current cable broke between the firewall and the flapper, you can easily add a piece.
The cable seems to be nothing more than just a steel wire. I would think the steel wire that can be purchased in spools at a local home improvement/hardware store would work.
Take out a length of the wire, straighten it and bend in half then fish it through the tunnel. Since the originals had the barrel at the end to connect to the flapper, I just got the ends from another cable and wire clamped them onto the new wire.
Since the flapper boxes have the spring in them that does the closing, why can't a braided cable work? Has anyone done this?
I'm fairly sure the cable plays a role in grounding the circuit to the heater booster fan in the engine compartment. So your choose of materials could determine where that fan continues to work.
I had the lever out this spring. It's probably not a bad idea to take the lever apart and clean it up.
I'm guessing the coated single wire cable would act smoother than a stranded cable, that would eventually fray, and abrade the tube.
I went to my local bicycle shop and bought a length of brake cable (or shifter cable). I can't remember how long it was, but it was cheap, less than $5. Crimp some ends on, and you're good to go.
Cheers,
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