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FYI......over time (23 yrs) my coolant tank began to develop "tiny "spider cracks". Under pressure they would open slightly and coolant would leak BELOW the trunk carpet and raised trunk floorboard. I couldn't figure out how I was losing a little coolant each time I drove it and needed to add every few weeks.
Once i started to see a few drops on the garage floor I began investigating the source........to my shock, once I removed the trunk's raised floorboard I saw a puddle sloshing around.
SO........old plastic coolant tanks can leak slowly under pressure even though they visually look good and not discolored.
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