#1: Low refrigerant (refrigerant leak) Refrigerant absorbs the heat from your indoor air and carries it to your outdoor unit to be released outside. If you have low refrigerant (almost always caused by a leak in the refrigerant lines or coils), it could cause your AC to blow warm air.Jul 28, 2017
Why does my AC sometimes blows hot air?
When the cooling system's filter is dirty, the air conditioner cannot properly move air through the system. This issue strains your air conditioner and can cause an AC to blow warm air. ... If the existing air filter is dirty, replace it with a new, clean filter to see if the warm air issue resolves.
Why AC stops cooling after some time?
The clogged filter may have caused too much stress on the blower motor and forced the system to turn off. Another common source for short-cycling is a malfunctioning thermostat. When a thermostat detects false temperatures (“ghost readings”), it will cut short the cooling cycle.Aug 26, 2019
How do you fix a air conditioner that blows hot air?
If your AC is blowing hot air, the thermostat may have been accidentally set to “heat.” If this is the case, it's easy to fix on your own. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again.Jul 18, 2021
Why does the AC give off cold air and then warm for some time and then again cold?
If your A/C flip-flops from hot to cold and back again, your expansion valve could be failing. The expansion valve removes pressure from liquid refrigerant to allow expansion from a liquid to a vapor state in the evaporator. If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted.
Why is my AC blowing hot air instead of cold?
If your air conditioner is blowing out warm air, your unit's refrigerant levels might be low. This usually indicates a refrigerant leak in your system! If that's the case, your air conditioner will continue to run and blow out warm air, trying to reach the temperature you set on your thermostat.
Why is my AC cooling intermittently?
Intermittent cooling is often caused by the components of your vehicle's AC system freezing up. Typically an iced over evaporator is the culprit. An evaporator covered in ice can't cool the air, so you would have to wait until the ice melts, which is why the cold air eventually returns.Jul 25, 2015