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The A/c System on V8 G8s is prob the most misunderstood system on entire vehicle,no magnetic clutch,no relays.always spinning, but if you have a non noisy comp.and pressure values do not change when comp is commanded on, make sure you have a commanded 4 -14 volts at 2 wire connector at actuator, if present a simple actuator fixes this on most,just unbolt 3 comp bolts and pipe twist comp without removing to access actuator, remove snap ring at actuator and spend another hour working out of comp body ! Reinsert new sol into comp with connector facing rear of comp, install snap ring, reinstall comp, vacuum and recharge system and bam, works as new
 

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