My electric fans do not come on at all in either low or high.

To check out the low side, I jumpered the white pigtail wires at the receiver/dryer and I can hear the fan relay clicking. I can also trace 12 volts down from the 30 amp strip fuse near the fuse box to the dropping resistor behind the front left headlight. I'm getting 12 volts on both sides with the ignition on.

On the high side, when I pull the temp sensor (shown in picture) off the intake manifold with the car running, the fans do not come on.

Any ideas?

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles