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I have a 2009 honda civic ex 1.8 need help my ac compressor won't turn off at all even when the car is completely off nd the key is not in the car the ac compressor still on nd drains my battery over night i took it to a diagnostic but the place they did it at sead they dont work with does kind of problems they couldnt help me ive surched up google and youtube but can find why my ac compressor stays on even when car is completly off ac compreasor works blows cold air and everything but it wont turn off i have to disconnected over night
 

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Your AC relay likely is stuck in the closed position thus keeping the mag clutch energized full time. Replace the AC relay and while your at it replace the AC fan relay as well. These are known weak relays and lots of issues have been reported.


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How can the compressor run when the engine is off? It runs off the serpentine belt.

+1 to replacing the relay. Try removing it completely before buying a new one.
 
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