Honda Accord Coupe 1991 Reference Owner's Manual page 111

System Maintenance
Run your air conditioner at least once a week for about ten
minutes, even during the off season, to lubricate the seals and
the inside of the compressor and, to verify that the system is
functional.
If the air conditioner is not cooling properly, it may indicate an
undercharged system. Have your dealer check the system for
leaks, then evacuate and charge the system with 900 — 950 g
(31 — 34 oz) of Refrigerant 12.
CAUTION: Prolonged use of an undercharged system may
damage the compressor.