DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > AC is freezing

Thread Tools Search this Thread Display Modes
Old 08-19-2008, 03:05 PM  
Junior Member
Join Date: Aug 2008
Posts: 2
Default AC is freezing

Hello everybody,

My central AC is working fine (for several hours): cool air is blowing, fan is working, etc.. Then its radiator (or how this thing is called that cool down the air) is slowly covered with ice, and after that (sure thing) it stops blowing.

Usually I just switch to "Fan" mode and wait till all ice is melted. But I feel something is wrong.

Please help,

vmikhalyov is offline  
Reply With Quote
Old 08-19-2008, 04:38 PM  
Senior Member
Join Date: Mar 2006
Posts: 2,990
Liked 4 Times on 4 Posts

Send a message via AIM to glennjanie

Welcome Vlad:
You are wise to switch to the 'fan' mode when the A?C freezes over.
There are a few things that can cause the evaporator coil to freeze:
1. Not enough air flow over the coil to give the refrigerant an exchange of heat. The fan needs to be running on its highest setting, cold air moves slower than warmer air.
2. Too much refrigerant is comming into the evaporator coil. This can be caused by a faulty metering device; which is very rare.
3. The condenser coil (the one outside) is too dirty and needs to be cleaned; this should be done every year.
4. Overcharge or undercharge of refrigerant. Either one can cause icing.
CAUTION; if you call a serviceman and he tells you it needs 'a little gas', ask him where the leak is. If he can't tell you, he doesn't know what he's talking about.
5. If you have had it serviced in the last few years and they added refrigerant to the systme, it is probably overcharged. A dirty condenser coil can make the low side pressure appear to need more refrigerant. This will help temporarily but it will go right back to trouble in a short while. The key is 'CLEAN FIRST, GAS LAST'. Many servicemen don't want to put their hoses on the High side because it gives them frost bite when they take it off; again, they don't know what they are doing. When refrigerant has been added repetedly without cleaning the condenser coil, the high side pressure can go well above 400 psi, which is dangerous.
Let us know how you come out with it, we may be able to help further.

glennjanie is offline  
Reply With Quote
Old 08-19-2008, 06:32 PM  
Junior Member
Join Date: Aug 2008
Posts: 2

Thank you Glenn,

I'll try to clean it and report about results.

vmikhalyov is offline  
Reply With Quote
Old 09-07-2008, 01:32 PM  
Junior Member
Join Date: Sep 2008
Posts: 2
Default Freezing AC

I had the same problem. It can be anything from dirty filters to a bad thermostat. This website has a section devoted to air conditioners and how to troubleshoot them. It helped me with my situation.
jerry2009 is offline  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Freezing Help!!! Please aljgr62 HVAC 0 01-12-2009 11:01 PM
AC keeps freezing llboogie99 General Home Improvement Discussion 3 07-28-2008 02:30 PM
Freezing pipes on a heat pump pens66 HVAC 5 06-28-2008 07:29 PM
Freezing drain line johnnyboi1016 Plumbing Forum 8 09-20-2007 07:48 AM
HELP: Micromark England drinks chiller/fridge is freezing. carla118 General Appliance Discussion 0 06-25-2006 07:51 AM

Newest Threads