Thomas M wrote:When you do the flush, what keeps any crud from clogging the radiator and heater core again?
When you do a typical cooling system flush, solids aren't present. Your situation is unique.
Thomas M wrote:Do you have to back flush the radiator and heater after the flush procedure??
If you remove all the solids from the system before flushing the system, these can be included in the overall system flush. You will probably need to remove hoses, tstat, etc and use a hose and flush through the block to try to remove all bits that you can. As mentioned above, you situation is unique because there are solids in the system. You need to remove those solids before installing new components and potentially plugging them up.
Thomas M wrote:I guess the heater core can be flushed with it in place. Can the radiator be flushed in place???
I wouldn't. I'd take the radiator out so you can look into it, rotate it, shake it so that you can make sure you get 100% of any solids out of it. If you are buying a new radiator as your buying new everything comment suggests, then the only item you would need to fully flush would be the block. Once that's properly flushed, then installing new hoses, water pump and heater core and radiator should have them in a clean system.
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