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Administrator
Join Date: Dec 1969
Location: Silly-Con Valley
Posts: 14,924
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The 1.8 AAR (unless you're talking very early 1.8, which uses what looks like the 1.7 one!) is a disk valve (disk with a hole in it) that is rotated by a bimetallic strip. If yours is truly broken, you can try opening it all up and cleaning it/checking if anything is disconnected/unsticking it.
--DD
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