Crown Victoria V8-281 4.6L SFI (1998)
Compressor/Pump Relay: Description and Operation
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A relay is needed because the control module cannot directly provide the high current needed to run the compressor motor. It operates as follows:
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The control module grounds Circuit 420 (DB/Y) to energize the relay coil.
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When energized, the coil creates a magnetic field which closes the relay contacts, connecting Circuit 1053 (LB/PK) to Circuit 538 (GY/R).
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High current then flows from battery to the compressor motor.