Hawkeye coolant change

After having a good check over the blue hawkeye, the coolant looked filthy so I drained the system and filled it twice, with a heat cycle in between. Then for the final time, I filled and burped the system . It looked like the previous owner hadn't bothered looking after the basics. The coolant overflow tank was filthy so I had to remove it and physically clean the interior surface and replace. it came up well using engine degreaser and snow foam to remove the degreaser.