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Hello! i'm new to threads and am looking for advice, i have a 2019 honda civic sport sedan with the 2.0 liter engine. so my car just started doing this thing where if i turn on the AC and have the temperature cold, it blows air; however, if i turn up the temperature to the max, no air at all goes through the climate vents and blows slightly through the defroster vents. if i turn on the defroster however, it blows fully, hot or cold air. so basically, i only get hot air through the defroster, has anyone had this issue and if so, please give me advice as i honestly have no clue. thank you!
 

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I had a similar experience with an older accord try this sometimes flapper vents get stuck like a chimney with dirt. open or close improperly. Go from max heat gradually increasing the fan speed then going to max cold Wich will make the vents open and close. Also check your cabin air filter behind the glove box could be completely clogged with dirt leaves etc. go to Utube for changing civic or any cabin filter. Try that first. It solved my problem
 
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