Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes.
Vacuum air conditioner vents.
When done put a fresh filter in.
Unscrew the air duct covers or grilles from the walls.
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I only do this for the vents where the air blows out.
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Let the grilles dry completely.
Unscrew air conditioner vent grilles and give them a good thorough cleaning using warm soapy water and a soft bristled brush.
Use your brush to clean the grates thoroughly.
Consider renting a heavy duty vacuum for this.
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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.
Start the engine and set the air conditioner to max.
After about ten minutes turn your a c off open all the car doors and let the fan blow for another five minutes.
Turn off the power connected to the heating and air conditioning system.
That does a great job and you can do it with or without the brush.
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Set both the air conditioner and fan blower to max.
Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
After you ve sprayed all of your vents start your car s engine.