I have the exact same issue, however since my backdate I have never been able to get the footwell blowers to work through the relay.
Have a look here:
https://rennlist.com/forums/911-forum/1280140-automatic-heating-control-not-functioning-2.html
I'm yet to find the time to follow the advice given.
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cheers,
Phil
84 ROW Carrera (guards red), A/C delete, Fuchs 7 + 8 x 16, Koni Adj. F+R, sway bars 20F 22R. turbo tie rods, Strut brace, brake cooling kit, C/F Recaro GT3 copies.
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