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Q: Air Condition worksd for awhile and cuts off on 1999 Volvo V70

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Air unit runs ok until wheather temp is hot. Will run for 20-30 min and cut off. If turn unit "off" for approx 10 min, will work when turned back on, then will go off again. Unit does not have a diagnostic code.
(1) Answer
This can be due to low refrigerant, a bad pressure sensor or the A/C clutch is failing when it's getting hot. It will require checking the voltage signal to the compressor when the A/C starts blowing warm air.