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Originally Posted by Phil-Hex
So the original stat can change its position after being in the failed position for at least 5 year?
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There isn't a 'failed position'. It's either shut or open according to coolant temperature, but will remain shut if the wax capsule fails completely. This would explain your observations about coolant flow/drainage. I can't think of a more likely one.
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Car ran very cold when I got it, hence the first hose stat. Will pull the original out and see if that helps
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The original stat was obviously opening early as they generally do, but if the inline stat is fully operational, then clearly something is now preventing coolant flow through the head. Testing the original is the only way to know. Having done that, replacing it with the current, so-called Mk3 version, will probably negate the benefit of the inline stat.
TC