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Message: <blockquote data-quote="525i" data-source="post: 512021" data-attributes="member: 103">After the excitement of the previous day, I discovered a leak from the bottom drain plug. However tight the plug was tightened it was still dripping. So had to go back to the mechanic early today. He took out the drain plug and discovered that the 2 O rings had gone brittle and broke. Opening this plug must have damaged it.  When he bled the coolant, also noticed that the coolant had gone murky. It was clear amber when I put it in. In hindsight I suppose I should have flushed and rinsed the radiator instead of just draining it. I was so obsessed with getting all the water away that I did not think of flushing and rinsing it. Hence it's now mixed with years of sediment and gunk.  So lesson learnt. Flush and rinse the radiator thoroughly before draining it. Also change the O rings in the drain plug. Anyway, the whole system is still working like it should. No pressure. You would still get some air releasing when you open the radiator cover. Like opening a can of beer. But no water rushing out to scald you. </blockquote>