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It could obviously become simply loose and leak. When I did WP, thermo, flush, I also replaced the 'O' rings. The originals where some what flattened and hard after 13 years. So I would imagine in that state, it would take very little to start a leak.
So I had no coolant or oil when I did mine but the cooler/heat exchanger still had coolant and oil inside
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2002 S - old school third pedal
Seal Grey
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