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 - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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