Turn off the power connected to the heating and air conditioning system.
Vacuum air conditioner vents.
Consider renting a heavy duty vacuum for this.
Vacuum the ducts as much as possible.
Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes.
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Unscrew air conditioner vent grilles and give them a good thorough cleaning using warm soapy water and a soft bristled brush.
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After about ten minutes turn your a c off open all the car doors and let the fan blow for another five minutes.
Let the grilles dry completely.
I only do this for the vents where the air blows out.
Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
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When done put a fresh filter in.
Start the engine and set the air conditioner to max.
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Set both the air conditioner and fan blower to max.
Unscrew the air duct covers or grilles from the walls.
Use your brush to clean the grates thoroughly.
If they re very dusty and grimy you may want to use soap and water to make them gleam.