I don't think it actually goes "off" on the 987s (I may be wrong, though). My mother's '06 does the same, just shows no bars for fan speed.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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