Aux fan is on a temp controlled thermostat located by the pass. headlight, on top of the A/C dryer.

If that switch is bad, it's not going to come on.

Also check Fuse 14/16 in your fusebox, that controls a lot of relays.

(If your thermo switch is bad, I have one for sale cheap that I don't need)

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER