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And I found this on another forum and may explain why I had the belch that blew some coolant out.
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$100 (US) later - I have a new thermostat and a complete coolant flush and refil. The idle is perfect and the temp is perfect. They tell me that you can get an air bubble in the system a variety of ways, but the rusult it that it can migrate to the water pump and make the water pump produce almost no pressure to drive the water around. The water in the hot places boils and tries to push out through the overflow tank. When you cut it off, the air pocket contracts and drains the overflow tank
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05 Thruxton
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