Re: Foam type brown stuff in radiator
You may not have flushed out all the old coolant, as in removing heater core hoses and flushing the core, and dropping the two block plugs and flushing the block, both sides.
I would then replace any hoses over four years old, change thermostat, check it first in a pan of water, new cap, and add either a good brand of green 50/50 premix or mix at home with distilled water a 50/50 mixture.
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