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Classic Mustang Air Conditioning Pressure Switch

The pressure switch, which does not allow operation below a given pressure, shuts down the compressor when pressure gets too high. Two green leads complete this circuit to the compressor clutch.
Vintage Mustang Air Conditioning - Air Apparent

The pressure switch, which does not allow operation below a given pressure, shuts down the compressor when pressure gets too high. Two green leads complete this circuit to the compressor clutch.  View Related Article