Goodman Air Conditioner Not Cooling [Proven Solution]

Do you have a problem with a Goodman air conditioner not cooling? This article discusses the issue and proven solutions.

Goodman Air Conditioner Not Cooling – How to Fix

The following are possible ways to fix the problem of your Goodman air conditioner not cooling:

1. Replace the Air Filter

Dirt can clog the air filter and prevent the free flow of air from the air conditioning unit. The evaporator coil will also freeze if the filter is significantly dirty. You can try dusting and washing the air filter to see if it is still usable. But replace it if dusting and washing it does not work. Ideally, you should replace the air filter every three months.

2. Clean the Coil

The outside condenser coil may be so dirty that it cannot dissipate heat from the air conditioning unit. The freon that flows through the coil carries heat from the air conditioner and releases it through the coil. 

So, check the outside unit and clean the coil if you find it is dirty. If you are unable to clean it yourself, have a technician do the job for you. Typically, you should clean the coil every month for the best results.

3. Replace the Thermostat

Adjust the setting of the air conditioner to cool if it is not already there, then take a multimeter and check the thermostat for continuity. If the component shows no continuity when the AC’s setting is on Cool, it means the thermostat is no longer working and needs a replacement.

You may want to check the wiring diagram to see if the thermostat controls a heater. If it does, it may have more than two terminals, and the diagram will show instructions on how to test the thermostat correctly.

4. Check the Run Capacitor

Using a multimeter, check to see if the capacitor has continuity. Replace the capacitor if there is no continuity. It should provide power for the compressor to work, so if it fails, the compressor will not work. Consequently, the air conditioner cannot work to cool the house.

5. Test the Thermistor

Take a look at the air conditioner’s user manual to find exact resistance points and temperature before testing the thermistor. Next, get a multimeter and run a continuity test on the thermistor. As long as the temperature is changing, the thermistor’s resistance should change. So, if the resistance remains the same while you are testing it, even if the temperature is changing, or you find no continuity, replace the thermistor.

6. Test the Compressor

The compressor may likely be faulty, causing the air conditioner not to run and cool. However, it is not the most probable cause of the problem. Before checking the compressor, ensure other components more likely to cause the problem are in good working condition. 

If they are, and nothing else works, check the compressor. You may need the help of a professional to check it accurately. Otherwise, you may misdiagnose the compressor and spend more than necessary.

7. Boards

Check the main control board and temperature control board for signs of burning or arcing. If there is any damage, the air conditioner will not work as it should. In such a situation, you need replacement boards. However, be aware that control boards are not usually the primary cause of air conditioner problems. So, check other parts before inspecting the boards. Otherwise, you may replace perfectly good boards.

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Why Is an Air Conditioner Running But Not Cooling?

The following are some reasons your AC is running but not cooling:

1. Condenser Coil Is Dusty

Debris can clog the fins of the condenser and trap heat within the unit. As a result, the air conditioner cannot release cold air, even though you hear the compressor running. Use a vacuum cleaner with a brush attached to it to clean the coil. You can also opt for a hose to wipe away the debris.

2. Thermostat Is Defective

The air conditioner must be on the Cool setting for the thermostat to have any effect. Verify this before checking if the thermostat’s setting is at the correct point. Try turning it off and back on if it is not working. Then, wait for the compressor and fan to kick on and begin cooling. If that does not work, the thermostat may be defective.

3. Evaporator Coil Is Frozen

One of the signs of a frozen evaporator coil is the lack of cool air from the air conditioner. A dirty air filter, closed vents and even collapsed air ducts can cause the coil to freeze. Thaw the coil by turning the air conditioner off and pulling the power from the disconnect. 

Leave the unit unplugged for some time until the evaporator coil thaws. However, ensure every other part is in order so that the coil does not freeze again. If you are unsure how to check them, let an HVAC technician check the unit.

4. Ducts Are Leaking

The ducts are the part of the air conditioner through which cold air spreads to different areas of the house. If there is a leak in them, cold air will leak and reduce the cool air in the house. As a result, the air conditioner will appear not to be cooling as the temperature in the house increases. Fixing the ducts may not be a DIY job; it is best to let a qualified technician fix them if necessary.

5. Freon Is Leaking

Freon or refrigerant leak is a serious issue. Do not take it lightly, but find a quick fix. It is dangerous for both your health and the life of the air conditioner. You may want to top up the refrigerant yourself, and there are ways to do it. But you may not know the exact amount you. Besides, you will also need to seal the leak in the system to prevent future leaks. 

Therefore, only a certified technician should check and fix a possible freon leak in your air conditioning unit. You can contact the manufacturer or hire an independent technician.


It is not a good sign if you find your Goodman air conditioner not cooling. It is crucial to find a quick fix to protect the unit and keep your home as cool as you need. You can follow the steps in this article and check the air filter, evaporator coil, condenser coil, thermistor, thermostat, capacitor, and control boards. 

One or more of these components is defective and is causing the cooling problem. Replacing the defective parts will fix it, but hire a professional to check and service the air conditioner if the repair seems challenging. It is the best step for the air conditioner.

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