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It could be one of several things. There are sensors for evap, hi, low and intermediate pressure, refrigerant temp and the TPS, A/C Control Unit or ECU can affect the circuit (WOT cut-out.) It appears that the controller switches ground on and off to control the relay which then sends a positive 12v to the clutch field.
Check my locker for wiring diagrams. Remember, just because it feels cold when you jump the clutch doesn't necessarily mean there's enough freon to close the pressure switch.
Beav
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