Find the plug for your fans,put 12 volts to it momentarily ...do fans spin?

There is a plug in a clip (mounted on the frame rail,below and to the right
of the Reciever/Dryer(site glass and electrical sensors [and AC hose connections])
In this picture ,I'm leaning over the driver's side fender looking down.
The plug is just above center frame of the picture.
This is on a 300D ,but yours is similar.
Separate the two halves of the plug(after removing from the clip)
and apply 12 volts to the Pins on the male part of the plug(the wires of
which lead in front of the Radiator/Condenser and out of sight.)

All the usual disclaimers apply...If you don't know what you're doing,do
not attempt without direct ASE supervision.

Attached Thumbnails

 

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'84 300SD sold
124.128