I keep a summer clutch that is basically always engaged temp wise but not RPM wise. The way I understand it, a different mechanism controls the RPM kickout than the temp "kick-in". It's odd that both functions are inop. As mentioned, it may have been stored inproperly.

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1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa