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Originally Posted by Seadweller
Not to derail, but do these typically fail due to mileage or age?
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The usual item that fails is the diaphragm . It splits and is not accessible for diy replacement.
The cause is probably heat cycles/duration. But overfilling with oil or some other way of 'swamping 'the diaphragm is alleged to harm it.
I read of some in no-frost areas,disconnect and bypass the coolant connections on the AOS.