Jul. 10, 2017“Why is my air conditioner blowing air, but it’s not cold?”
Well, it obviously means your AC isn’t doing its job. You shouldn’t be feeling warm air coming from your vents.
So if your air isn’t cold, it’s likely because of 1 of these 5 common AC issues:
- Dirty air filter
- Thermostat is set to “ON” instead of “AUTO”
- Faulty fan motor
- Low refrigerant levels (refrigerant leak)
- Broken compressor
Prefer to have a professional diagnose and fix your AC issue? Our team of New Jersey experts can handle any AC repair, including the issues listed above. Schedule service today!
Start your troubleshooting here:
Issues you can fix
Problem #1: Dirty air filter
A clean filter (left) vs. a dirty filter (right)
A dirty air filter reduces airflow into your AC. Reduced airflow causes 2 major problems for your air conditioner:
- Limited air circulation: Since there’s not a lot of air entering your system, it can’t push out very much cold air.
- Frozen evaporator coil: If there’s limited airflow going over your evaporator coil, it could freeze over, which would also limit the amount of cold air that comes out of your vents.
Problem #2: Thermostat is set to “ON” instead of “AUTO”
Switch your AC fan to AUTO instead of ON
If your air conditioner blows out cool air only sometimes, and the rest of the time you feel warm air, it could be that your AC’s fan is on the wrong setting.
The right setting: AUTO. In AUTO mode, your air conditioner’s blower turns off once your room reaches your desired temperature.
The wrong setting: ON. If your AC’s fan is set to ON, your AC’s blower runs constantly, regardless of what you set the temperature to be. So it will seem like your AC isn’t working because it will run without cooling your home.
Solution: Set your thermostat’s fan to AUTO instead of ON.
Are the first 2 problems not the issue? Read on...
Issues a professional needs to fix
Problem #3: Faulty fan motor
Your AC’s fan (black icon) and evaporator coil (blue icon).
If your air conditioner is working properly, its fan will draw warm air over the cold evaporator coils and push that cold air back into your home, then repeat the cycle until your home reaches your desired temperature.
BUT, if your fan isn’t running, or it’s running too slow, it will cause low airflow. Like we mentioned before when we discussed dirty air filters, low airflow causes limited air circulation and a frozen evaporator coil—both of which mean you’re not feeling cold air coming from your AC.
Solution: Contact an AC expert to inspect your fan motor and the fan itself. If the motor has gone bad or the fan blades are damaged, you’ll need to replace them.
Refrigerant is the essential liquid/gas that cools your home’s air. Simply put, when you don’t have enough of it, your air won’t feel very cool.
Problem #4: Low refrigerant levels (refrigerant leak)
If you have low refrigerant, you almost always have a refrigerant leak, meaning the lines that carry this liquid/gas have sprung a leak.
Look for these additional signs of a refrigerant leak:
- Ice buildup on refrigerant line outside
- You hear a bubbling or hissing noise
- Your AC can’t cool your home on hot days, but does OK at night or cooler days
Think of your compressor as the heart of your AC system. It circulates the “blood” (refrigerant) between the inside and outside units. If it’s broken or malfunctioning, then your air conditioner can’t deliver cool air into your home.
Problem #5: Broken compressor
Solution: Contact an HVAC professional to inspect your compressor. Unfortunately, compressors are very expensive (if you don’t have a warranty), so your technician will likely discuss replacing the entire outdoor unit.