Re: Rusty Coolant
Buy yourself some Thermocure, it's made by Evaporust and meant for exactly your situation. Follow the instructions and you'll be amazed at how well it works. If it's really bad it might take two uses. I used it and the to tank of my radiator went from a rusty mess to clean shiny brass.
Once the rust it out I would use antifreeze but if you don't need the freeze protection do as Jim says. Your dad was right about antifreeze, on water my original petcock doesn't leak, on antifreeze it has a very slow drip.
I used to buy bottles made by Gunk, it was a white liquid. Can't find it anymore though.
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