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The 'a' dial controls the air flowing from the grill where it is to the windshield. as well as i can figure, it is used to keep the dash area cool and to counter the heat from constant sunshine. you can check by placing tissue paper over the vent grill and see if rotating the 'a' control makes a difference in air moving out of the grill there.
my airbag warning light came on when i started my car. The car was parked for[ several days in a hotel parking lot before i drove it. Is there a way to reset the warning light without going to the dealer have it done?