AC not cooling in Garland, TX is usually one of a short list of causes: a dirty filter or restricted airflow, a failed capacitor or contactor, a frozen evaporator coil, low refrigerant from a leak, a dirty condenser coil or a drain problem that shuts the system down. Use Call Now to describe what the system is doing and you will be connected with an independent HVAC contractor serving 9 ZIP codes around Garland.
Why an air conditioner runs but does not cool
| Symptom | Likely cause | What the technician checks |
|---|---|---|
| Ice on the lines or the coil | Restricted airflow or low charge | Airflow, coil, charge and thermostat settings |
| Air is cool but weak | Dirty filter, closed registers, failing blower motor or blocked return | Filter, blower amperage and static pressure |
| Water near the air handler | Clogged condensate drain | Drain line, pan and float switch |
| Fan runs, outdoor unit silent | Failed capacitor, contactor or tripped safety | Capacitor microfarads, contactor contacts, breaker and float switch |
| Air is only slightly cool | Low refrigerant or dirty condenser coil | Pressures, superheat, subcooling and coil condition |
Electrical parts that fail in the heat
The run capacitor helps start and keep the compressor and fan motors running. It weakens with heat and age, and a weak capacitor causes hard starts, humming and failure to start. The contactor is the switch that sends power to the outdoor unit, and its contacts pit and burn over time. These two parts are inexpensive compared with the compressor they protect, which is why technicians test them first on a hot day.
Low refrigerant means a leak
Low refrigerant always points to a leak because refrigerant is not consumed. Adding more without finding the leak is a temporary fix. The technician uses an electronic detector, nitrogen pressure test or dye to locate it, repairs or replaces the part, and recharges to the manufacturer's specification.
Coils, airflow and why they matter
An air conditioner moves heat in two places: the evaporator coil takes it from the indoor air into the refrigerant, and the condenser coil lets it go outdoors. When either coil is dirty, or the filter and ducts restrict airflow, that movement stalls. About 15 to 20 degrees of temperature drop across the indoor coil is a common benchmark for a healthy system, and a much smaller drop points to airflow or charge problems.
What you can check safely before you call
- Breaker on, and the outdoor disconnect pushed in. Do not open electrical panels
- Filter replaced or cleaned if it is dirty
- Supply and return registers open and not blocked by furniture
- Outdoor unit free of leaves, grass and debris
- Thermostat set to cool, lower than the room temperature, with fresh batteries if it uses them
Questions to ask before approving a repair
- What failed, how did you confirm it and can you show me the part or the reading?
- What are my options: repair now, repair and monitor, or replace?
- Will you give me the findings and the scope in writing before work starts?
- How old is the system and which refrigerant does it use?
- Is this the cause or a symptom of something else, such as low airflow or a leak?
How an AC not cooling visit works, step by step
Technicians who follow the same steps in the same order find the actual cause, not just the symptom. Knowing those steps lets you distinguish a thorough diagnostic visit from a part swap.
- Interview: what you noticed, when it started, how the system sounds and what you have already tried.
- Visual check: thermostat settings, filter, supply and return registers, the air handler, the condensate line and the outdoor unit.
- Electrical tests: breaker and disconnect, capacitor microfarad rating, contactor contacts, motor amperage and control voltage.
- Airflow and temperature: the temperature drop across the evaporator coil and, where needed, static pressure in the ductwork.
- Refrigerant checks: pressures, superheat and subcooling, and a leak search if the charge is low.
- A written finding: the cause, the repair options and what each one would fix, before any part is replaced.
Mistakes that make AC problems worse
- Ignoring a dirty filter. It is the most common cause of poor airflow and frozen coils.
- Running a frozen system. Ice means airflow or refrigerant is wrong, and running it can damage the compressor.
- Putting off a small repair. A weak capacitor can take out a compressor if left alone.
- Setting the thermostat much lower to cool faster. An AC cools at a steady rate, so it only runs longer.
- Adding refrigerant without finding the leak. The charge will drop again and the leak may grow.
What makes AC not cooling different in Garland
Dallas County suburb of roughly 250,000 east of Dallas, next to Lake Ray Hubbard and Rowlett. Summers regularly reach the upper 90s and 100s, so AC runs almost continuously from June to September.
Housing from the 1960s to the 1980s often has attic ductwork and older systems, including R-22 era equipment. Clay soil can shift and tilt condenser pads. The diagnosis and the equipment recommendation for your address can both be shaped by these local conditions, so ask the technician how.
AC not cooling across Garland and nearby cities
Air Conditioning Repair Garland covers 9 ZIP codes in Garland, Texas: 75040, 75041, 75042, 75043, 75044, 75045, 75046, 75047, 75049. Calls and requests also reach providers serving Rowlett, Sachse, Richardson, Plano and Wylie. Coverage is confirmed address by address, so give your ZIP code when you call.
Use Call Now at the top of the page, say what the system is doing and how old it is, and you will be connected with an independent HVAC contractor who confirms your address and diagnoses the system in person.
Related help in Garland
If this is not quite your situation, these pages cover the neighboring questions: AC Not Cooling? 12 Causes and Fixes; How to Lower Cooling Bills; Emergency and Same-Day AC Repair; Frozen AC Coil: Why It Happens and What to Do. The service area list shows every nearby city and ZIP code covered.
AC Not Cooling in Garland: common questions
How do I know if the capacitor is bad?
Signs include a humming outdoor unit that does not start, a fan that needs a push, or a unit that clicks. Only a technician should test or replace it because capacitors can hold a charge.
Can low refrigerant be fixed by adding more?
Topping up refrigerant without fixing the leak only buys time. The right fix is to find and repair the leak, then recharge the system to specification.
How long does a diagnostic visit take?
Often under an hour, depending on access and the complexity. The provider will explain what they find and what is needed.
Why is my AC running but not cooling?
Common causes are a dirty filter, a failed capacitor or contactor, a frozen coil, low refrigerant and a dirty condenser coil. A diagnostic visit tests each in order and tells you which applies.
Should I keep running the AC if it is not cooling?
No. If there is ice on the unit or lines, turn the cooling off and set the fan to on so the ice melts. Running a frozen or failing system can damage the compressor.
What if my AC is too old to repair?
Ask the technician for the system's age, its refrigerant and the likely expense of repair versus replacement. Once a system is older than about 12 to 15 years and has a major failure, comparing it with replacement is often worthwhile.