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My central air conditioner isn't cooling like it used to. I noticed that the refrigerant lines entering the evaporator coil in the plenum were icing up. What might the problem be?

marked as duplicate by Tester101 Jul 12 '17 at 15:48

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    Probably it has a leak, so you'd need to find the leak, fix it, and then refill the system. IIRC, icing up with poor cooling is often a sign of low refrigerant - but refrigerant does not GET low without a leak... – Ecnerwal Sep 24 '14 at 1:48
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    Poor air circulation can freeze a moderately proper charged coil. Change the filter and open more registers. Clean both the coils, at least the outside one with a garden hose. But sorry, 90% chance you're low on gas and that everything I mentioned is just dirty, too. – Mazura Sep 24 '14 at 2:40
  • This answer, or this one, this one, or maybe even this one might be helpful. – Tester101 Sep 24 '14 at 9:55
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    Somewhat counter-intuitive, but low refrigerant in a flooded evaporator system HVAC will cause the acting evaporator to ice up. You have a slow leak, have your HVAC tech come and check the system out. – Fiasco Labs Jan 30 '16 at 20:47
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Chemically clean the evaporator coil with coil cleaner, buy it at an appliance store.is filter ok.buy a cheapie for ac season they flow more air.

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