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"Huh? I have no such thing next to PS reservoir (?)"
Heater valve by power steering reservoir: that's a 944 S2 reference.
I see.. much better location than on top of bellhousing. In any case, while sleeping last night, it dawned on me that when my AC was working, I often heard the fans spin like an airplane taking off; I, too, have my money on fans not going to hi speed!