White flakes occasionally blow from my ac vents?

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SeANMcBAY
Posts: 4
Joined: Wed Apr 07, 2021 2:57 pm

White flakes occasionally blow from my ac vents?

Post by SeANMcBAY »

This has happened to me maybe 2-3 times since I recharged the ac. I’m pretty sure I didn’t overcharge it but are there any other explanations? I live in a hot area that needs constant ac use and it doesn’t happen every time.
tpollauf
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Joined: Wed Jan 20, 2010 11:37 am
Location: Toledo/Oregon, Port Clinton Ohio
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Re: White flakes occasionally blow from my ac vents?

Post by tpollauf »

Hey there Sean, I may be able to shed some light on this subject for you. If you occasionally get "frost" blowing out of the vents, it could be due to a couple of reasons. First off let me explain the conditions that your indoor (evaporator) coil go through. The coil should ALWAYS be "sweating" and never "frosting". Frost on the coil generally is due to a couple reasons. Lack of airflow is the biggest reason. This could be due to a dirty cabin air filter, dirty evaporator coil (if the filter was removed for several years and operated that way), too slow of a blower speed, damper stuck on "MAX AC" where it is constantly recirculating the indoor cabin air. On the refrigeration side of things, frost would be due to a slight UNDERCHARGED condition. If/when this happens you'd likely notice your low pressure cycling switch going nuts (on/off repeatedly every 5 seconds or so). During each "off" cycle, the coil could have a moment to defrost itself. Hope this helps a bit and thanks for bringing up this topic! :D
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2009 Vibe GT (manual), 2009 G8Gt, 2009 Vibe GT (auto)
2014 Silverado, 2004 Vibe GT, 2003 Vibe GT (project car)

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SeANMcBAY
Posts: 4
Joined: Wed Apr 07, 2021 2:57 pm

Re: White flakes occasionally blow from my ac vents?

Post by SeANMcBAY »

Thanks for your informative post. I’ll try changing the filters first and seeing what happens.
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