Again the low speed of the aux fans is controlled by turning on the A/C compressor. The pushbutton control panel sends a signal to a relay for the low speed fan control. From there it goes to a "ballast" resistor under the left headlight & then to the fans.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator