I cheated. By loosening the bottom radiator hose at the block and letting about 1 quart drain into a clean bucket. Just don't over tighten the clamp and make sure the clamp is in the same position on the hose before you touched it. Then I took the drained antifreeze and poured it back into the overflow bottle, minus a little crud on the bottom.
As to cleaning the ETM, please be careful not to rub it. There is a Canadian firm that makes replacement ETM for 1/2 the dealer price and will last forever.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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