NTG3100LJG1 Comfortmaker Not Cooling Well - HVAC - DIY Chatroom Home Improvement Forum


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Old 09-16-2012, 04:36 AM   #1
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NTG3100LJG1 Comfortmaker not cooling well


So far I have washed and scrubbed the outside fins on the condensing unit. It runs well. No debris noted.
On the freon line it has a window to view freon movement. There has always been bubbles of air but there might be a few extra it's really hard to tell.
The freon line is cold to the touch.
I have cleaned the inside evaporator coils and checked the drip pan.
I added some bleach water to flush it. It's open and draining well.
The air movement inside is strong but just not cooling.
Will it help to dismantle the condensing unit and clean the coils there?
What else can I do?
I am a do it your self girl and need some advice on what other things I might need to check before calling in a repair person.

Thanks in advance for any comments, help and advice.
This site has always been my 1st stop for HVAC troubles...TYSM DYI!

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Old 09-16-2012, 12:10 PM   #2
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NTG3100LJG1 Comfortmaker not cooling well


you need the temperature split between the return and supply.....the closer you get these temp at evaporator is better. If the difference is under 15 you need a tech to check the pressure. If the temp is between 15-20 you may have attic insulation problem.

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Old 09-16-2012, 02:30 PM   #3
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NTG3100LJG1 Comfortmaker not cooling well


You want the site glass to look clear, not bubbles.. I would have someone come out and check freon levels
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Old 09-16-2012, 02:55 PM   #4
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NTG3100LJG1 Comfortmaker not cooling well


As JJboy mentioned, 15-20F is usually a good differential number between supply and return air and I like to measure the return air at the plenum or as close as possible. Speaking of duct, don't overlook that inspection since some installs can be awful shoddy and have been known to fall apart. For instance, a return duct inhaling attic temperature air ( even a minute amount ) can effect performance drastically.
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Old 09-23-2012, 02:32 AM   #5
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NTG3100LJG1 Comfortmaker not cooling well


Thank you for all the replies.

I've taken the temps.

Near the evaporator 45 degrees.
1st exit duct into the house 75 degrees.
Temp at return vent 80 degrees.


The evaporator drain pipe blows ice cold air and this is where I checked the temp and how I check for a plugged drain.

The outside condenser unit still blows cool are where it should be hot.


Air bubbles in the eye glass have always been present even after servicing.
No signs of oily residue anywhere.

A friend said they replace freon by pressure readings and when it reaches the desired pressure they stop filling the freon. Is this good info?

Now I'm wondering if the duct work in the attic is intact.

Thank goodness for the window unit.
I really can't afford a service person and must save for this.
LOL week to week for me.
Guess that's why I like DIY.
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Old 09-23-2012, 09:23 AM   #6
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NTG3100LJG1 Comfortmaker not cooling well


Looks like Evap coil is getting frozen. (Low Freon)...
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Old 09-23-2012, 06:45 PM   #7
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NTG3100LJG1 Comfortmaker not cooling well


Thank you JJBoy.
Gotta save for that service then.

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