Unscrew air conditioner vent grilles and give them a good thorough cleaning using warm soapy water and a soft bristled brush.
Vacuum air conditioner vents.
When done put a fresh filter in.
Set both the air conditioner and fan blower to max.
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Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
Consider renting a heavy duty vacuum for this.
Let the grilles dry completely.
If they re very dusty and grimy you may want to use soap and water to make them gleam.
I only do this for the vents where the air blows out.
Vacuum the ducts as much as possible.
Use your brush to clean the grates thoroughly.
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That does a great job and you can do it with or without the brush.
Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes.
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After you ve sprayed all of your vents start your car s engine.
Turn off the power connected to the heating and air conditioning system.
Unscrew the air duct covers or grilles from the walls.
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Use a high powered vacuum my tool of choice is a shop vac to vacuum just inside the ducts removing any dust or debris.
After about ten minutes turn your a c off open all the car doors and let the fan blow for another five minutes.