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Re: What is this in radiator
I haven't seen many radiators worse than that! That looks like no antifreeze or an extremely high mineral content water used in a system thats been leaking awhile and added to constantly. The radiator will have to be "rodded out" by a radiator shop or replaced. The use of 50/50 antifreeze or antifreeze diluted to 50/50 with distilled water needs to be used. The engine and heater core should be totally flushed and hoses replaced as well. I'd replace the thermostat and radiator cap too. In the future you may have water pump problems unless you choose to replace it now. Inspect the engine block plugs as well.
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