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AC blowing warm air and intermittent compressor engaging

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I'm servicing my Mother's car right now and the AC blows warm air when on Max and high fan speed, and the compressor seems to be cycling weird.  With the engine turned on and Max AC is running at high fan speed the compressor clutch engages spinning for about 10 seconds, and then it disengages and stops turning for about 10 seconds.  It keeps doing this on and off deal until the AC is turned off.


Is what I'm seeing consistent with low freon/R-134a?


Her car did this last spring and I added some refrigerant and the AC began to blow cold again, although I'm not sure if the compressor was behaving this way last time.

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