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Also, looking at your year's schematic, there is a pressure switch in the A/C system that also grounds the missing wire. Since the wire is missing at the relay, this function is disabled in your car as well. The pressure switch should ground the high speed signal terminal on the relay in order to increase airflow over the condenser if the pressure gets high enough. Early cars always run the fans at high speed with the A/C compressor on, so they must have implemented this on later cars to reduce noise when high speed is not needed.
If you can't find the wire on the lower end of the thermoswitch cable, you might be able to jumper over to the pressure switch (wherever it is, my early car doesn't have one) to get the signal up to the relay end. You're still going to have to splice it on the upper end.
If you end up running a whole new wire, be sure to run the relay to both the thermoswitch and the pressure switch.
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Early '85
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