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Q:

air conditioner on 2002 Toyota Camry

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The air conditioner quit working and the light flashes. Think it
may just be a relay.
(1) Answer
The light is flashing because a fault was detected in the heater-A/C system. You will have to have the system checked to determine why the fault was detected, there are many possibilities.