Also if the electric clutch or drive belt slips the light will blink. There is a position sensor on the compressor so the climate ECU knows how fast the compressor is turning compared to the engine crank, assuming a 1:1.5 pulley ratio if the engine is at 1000 RPM and the compressor is at only say 1300 instead of 1500 the car knows something is wrong and disables the A/C to protect the clutch and belt from further damage.
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