1. Thermostat problem :
The most common cause of hot air from your air conditioner is that the thermostat is switched to the heating mode. It happens to all of us. Sometimes thermostat is accidently switched to the heating from cooling mode. No need to worry in this kind of situation, just go and switch it to the cooling mode again and you are good to go.
2. Dirty air filters :
If your air conditioner’s thermostat is at cooling mode but you are still getting hot air from it, then the problem can be caused by the air filters. Air filters are used to filter the dust particles from the air of the air conditioner. But when those air filters are dirty enough that the air cannot pass through them, you usually get no air or comparatively hot air. To solve this issue, you just have to change the old filters with the new ones.
3. Refrigerant Leak :
Speaking of refrigerant leaks; this issue can cause your air conditioner to blow hot air too. Remember, refrigerant does not need to be refilled, so if there is a leak, you need to call a professional. Exposure to refrigerant can be dangerous for humans and pets, so be sure to act promptly.
4. Breaker Switch Is Blown :
There are multiple components that make up an air conditioning system, and if one stops working, the whole system can fail. If the breaker switch fails, it will halt power to the outside unit and impede the production of cool air. If this is the case, the first thing you should do is check the breaker and see if anything has tripped. If so, reset it and see if this remedies the problem. If the problem persists, it could be indicative of an underlying electrical issue, and you should call a professional electrician.
5. Condenser Coils (Outdoor Unit) :
If you’ve checked the thermostat, breaker box, air filter, and indoor coils, it’s time to go outside to inspect the outdoor unit. Just as the indoor evaporator coils need free airflow, so do the outdoor evaporator coils. That’s why it’s recommended to maintain a minimum 2-foot clearance around the outdoor condenser unit at all times.
6. Worn out compressor :
The compressor is the heart of your air conditioning system. Its function is to circulate refrigerant through a series of stages that allow it to remove heat from your system cabin. Similar to many other car parts, the compressor can wear out over time. Due to its complicated design, compressor failure can be attributed to contamination or other failed parts within the system.
There are some things that you can do to help prolong the life of your AC’s compressor. First, make sure to run the compressor for about 10 minutes once a month in the offseason, regardless of the temperature outside. This is easy to in most modern vehicles since they utilize the compressor when the defroster, which is used year round, is activated.