Once the car was back on the ground, and front clip stored away, the radiator was power back-flushed with a tool that uses a combination of water from the faucet and air pressure to dislodge swarf caught in the inlets of the core tubes. While there was a little visible swarf in the tubes visible from the vantage point of the shutterstat opening, there was a much bigger build up of muck. The muck appeared to be soluble oil and grime. Not a bad situation as an initial treatment of dawn dish soap and flushing began to reveal very nice looking metal.
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