Block drain petcocks are usually clogged with sediment. You can take the petcock out and clean out the sediment with a stiff wire.
Best way to flush is to remove the thermostat or bypass hose so water will free flow through the system with the engine running. Hang the garden hose in the radiator, open all the drains, start the engine and run it up to speed with clean water going in and the dirty water and vinegar being flushed out. When it runs clear water, usually about 15 minutes of flushing, turn everything off, replace the thermostat or hose, let it drain, and refill with 50-50. Or use straight antifreeze and distilled water.
But, if it was full of rust, expect to have to repeat soon as there will still be rust in the bottom of the block. It may or may not stay settled, depending on how bad it got.
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Today's Featured Article - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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