You don't have a 212 switch on that car. 212 switches were started in 85 with the 123 chassis. I think 212 were on SD's earlier. The 212 switch would be in the thermostat housing, which you don't have.

You can check the 140 (I think its 140f) trigger switch that is mounted on the receiver dryer by grounding it while the engine and the a/c is on. If the switch is bad, it can be replaced without evacuating the a/c system. I think its under $20.

You probably ought to check the area behind the aux fan since that often gets clogged with debris. You'll need to remove the fan to get at that area.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)