If you unplugged the engine temp sensor and it's still running, it must be running LOW. The problem would be your refrig. pressure switch at the A/C drier. Try unplugging that and the fan should stop. If it doesn't, you have a bad relay. I'm thinking that the HIGH fan aux circuit might be OK if the aux fan runs on LOW.

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sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen