Any of you guys do HVAC?

[Holyman]

The wife tells me the AC is on but no air is coming out of the vents.

After rolling my eyes hard enough to heard from a block away, I got up and found out she was right. I took the cover off the plenum to inspect the guts and found the fins plugged with an eigth inch of lint encased in 1/4" of ice. After I thawed it out and brushed all the fins with a tooth brush, I blew it all out with the air compressor.

Today, frozen again even without the lint.

It's humid here but not THAT humid.

What the heck is going on?

[MudSlinger09]

ok hey my dad is an electrician and used to work on ac`s for a living ive seen this happen actually , ok i caleld my dad, he said low freon , below 58 psi on the lower side or somthin like that , he said thats one of the reasons its probly doin it

Edited July 15, 2005 by MudSlinger09

[JA66]

We've been having the same problem and we just got it fixed for the second time yesterday.... I'll ask my dad when he gets home to see what they did to it.

[dlnoss]

Low on freon will cause that. I'm no HVAC expert but if the low side needs to be above freezing on the guage. Often there is a table on the inside of the cover or on the condenser by the valves.

[jeepman380]

Yeah definately need to check the freon. Not really an expert in the home A/C field but checking the freon would be a start.

[reded]

low on freon...not enough pressure is causing gas to go back to liquid and freezing it up

[Lepew]

I've only work with automotive A/C systems but they work on the same principle as your home. Your system is working great but too great and it is freezing the evaporator. The system should have a way to regulate the evaporator temperture so it will be as close to freezing without freezing to cool the air passing thru it. In the automotive world it is usually controlled by a pressure switch or a thermal switch. Look in that direction and you'll might find the problem. Your system is probably fine on the freon level or it would never get cold. Good luck!

[KGL]

Make sure your drain line is clear , water backing up in the system (tray) will sometimes cause freezing.

There may also be some type of freezestat in there to check too , I'll try to get back to you on that.

[MudSlinger09]

Your system is probably fine on the freon level or it would never get cold. Good luck!

i seriously doubt it man

[Wheatchex]

One other thought, clean/change the filter. If there is not enough air flow the water will condense and freeze on the coils. this has happened to me a couple of times. Usually it's at the begining of the cooling season and I've forgoten to replace the filter.

 

Wheatchex

[fixitrod]

If the fan outside is running strong and the filter is clean you are probably low of freon like everyone else said.

 

I've seen the contactors go bad, fan (outside) not run properly and cause freezing too.

 

If you have a leak, get out your wallet

[racer]

we had a leak at the house a few years back. it took 3 service calls to get it sorted out.

[Holyman]

$125 later, it seems I was 2lbs low on freon. Let's see how this works.

One cool thing tho... guy looked just like Sean Connery.

[98bonerSTOCKshee]

One other thought, clean/change  the filter.  If there is not enough air flow the water will condense and freeze on the coils. this has happened to me a couple of times.  Usually it's at the begining of the cooling season and I've forgoten to replace the filter.

 

Wheatchex

392765[/snapback]

use to happen to me all the time... My dad was in A/c for like 25yrs, It would freeze he would always first check my filter OOPS thanks dad!!

[Lepew]

i seriously doubt it man

392720[/snapback]

Well If adding freon fixed it than I was wrong. Your HVAC must be a fixed orfice system so the amount a freon dictates the evaporator temp.