Tip & How-To about Heating & Cooling

Frozen Airconditioner

When an air conditioner freezes over there are two main reasons.
1. Something is dirty - it could be the coils outside the house, the coils at the unit inside the house, and/or a dirty air filter. If any one or more of these are dirty the air flow is restricted. Without warm air giving off it's heat to the air conditioning coils, the AC system will freeze itself.

2. The system is low on refrigerant. This generally takes more tools and knowledge to test and correct. It's best to get an HVAC tech to do take care of that.

In this video I show how I cleaned the evaporator coils to my air conditioner. They were really dirty. The other problem I had was a dirty air filter.

It's also best to get an HVAC tech to clean the evaporator coils too, but with a fair amount of caution and patience one can do this and save the expense of paying a tech to do it. However, one careless slip resulting in puncturing a refrigerant line and you WILL need a tech to fix that and it will probably cost more money overall than the service call you are trying to avoid by cleaning the coils yourself

Additionally, there are some fairly sharp edges and one can suffer a serious cut from just a split second of inattention.

Go slow and pay attention.

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Fix freeze up

There is a reason they freeze up 1. low on freon..2 evaporator coil needs cleaning(inside coil)..3. very dirty air filter, any one of these for a an air conditioner may freeze up... due to a number of other reasons. The most common reason for an air conditioner to freeze up is low on refrigerant.

Jun 27, 2015 | Heating & Cooling

2 Answers

why does my ac freeze up

Hello, air conditioners will freeze either due to low airflow.....such as dirty filter, dirty evaporator coil, weak or not running blower motor. Also, a low refrigerant charge can cause the unit to freeze up.

Jul 09, 2012 | Danby Heating & Cooling

2 Answers

ac line freezing up from outside to house

AC lines freeze on the outside of the house when the insulation for the copper tubing is damaged or missing. if this is not the case in your situation, there may be a small refrigerant leak in the tubing.

Hope this helped you and thanks for choosing FixYa.

Aug 24, 2011 | Heating & Cooling

1 Answer

it keeps freezing up if you put it past #5

Hi and welcome to FixYa. I am Kelly. Freeze ups are caused by a couple things.

1. The first thing is a dirty evaporator coil. Air conditioners that run 24 hours a day should be thoroughly cleaned every 90 days.

2. The Blower fan wheel is dirty

3. The fan motor is not running fast enough.

Most of the time these 3 items listed above are the main reasons and Air Conditioner Freezes up.

Thanks for using FixYa,


May 10, 2010 | Friedrich Casement SC06H10D Air...

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