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See if you can buy a flushing kit. There are two types of stuff to clean the system, one you run 8-10 hours the other 10 minutes. This removes rust and deposits in the radiator and heater core.
Then install the "T" on the heater inlet hose (with the valve)
and back flush the whole system with the valve open (heat on high) until the water is clear. Drain the radiator and add antifreeze.
And you may want more than a 50/50 mix..maybe 60/40 it all depends on your expected low temperature 50/50 is good down to -37C


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