One of the most common reasons is that one of the components in the system may be overheating, such as the compressor or condenser. Another issue could be a faulty condenser, which is responsible for transferring heat from inside your car to the outside atmosphere.
Probably because it's old or poorly maintained. Maybe it's low on refrigerant or has a dirty filter. Could be a sign of a bigger problem, like a faulty compressor or a leak. Don't get your hopes up for an easy fix, you'll likely need a professional to diagnose and repair it.
It will blow hot air for a short while when it turn on again for the compressor takes time to work and some refrigerant lines connecting the compressor and the furnace (evaporator) is a significant distance. Until the evaporator cool down, the fan is just circulating the hot air trapped in the duct.
Hot air from the vents: It might sound counterintuitive, but too much refrigerant can cause hot air.
Assuming all the components are fine and there's nothing wrong with the a/c system, the two most common reasons i could cite is either the system was overcharged with freon, preventing proper circulation, or the drain hose is clogged with dirt/debris; icing the cooling fins before the fan, blocking the air from going ...
A very useful diagnostic aid is the “Feel Test”. As the test implies it is a matter of quite simply feeling tubes and components for temperature drops, indicating possible blockage location. By this stage you would be aware of what side of the A/C system should be hot and what side should be cold.
If the AC is circulating air but not cold air, there might be several potential reasons for this issue. A freon leak is going to be the most obvious reason for the air conditioning blowing warm. The car air conditioning relies on coolant to cool down the outside air before circulating that cool air into your interior.
Having too much refrigerant in your AC can damage the compressor. This can happen because the excess refrigerant will likely collect inside the compressor and cause subcooling, wherein temperatures are below normal. Furthermore, the extra refrigerant can flood the compressor and damage its mechanical parts.
It could be a number of issues, such as refrigerant leaks, faulty compressor or compressor clutch, blocked air vents, faulty thermostat, broken cooling fans, a blown fuse, electrical problems, a broken condenser and blower motor issues. All of these issues can cause your AC unit to stop operating properly.
The most likely reason your air-conditioner isn't cooling is the car's air-conditioner is leaking. The car's AC system needs freon to lower the ambient air temperature and creates some needed cold air. Whenever there is a freon leak on your car there is no way to cool the air.
The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.
An AC leak will lead to warmer air from your vents over time. In most cases this can be fixed with a proven stop leak additive to seal up any leaks. When it's time for an AC recharge, turn to AutoZone.
Symptoms of a Faulty Orifice Tube
You might notice a significant drop in cooling performance, unusual hissing noises, or even frost on the evaporator. These symptoms indicate that the refrigerant is not being properly regulated, which can lead to inefficient cooling and potential damage to other components.
So if the refrigerant in your system doesn't get used up, what's happening to it? It's leaking out, that's what. If your A/C is blowing hot air, it's safe to say it's probably leaking. Adding a refrigerant with stop leak additive and O-ring conditioner could cure the leak.
If your AC is running but not cooling, it could be due to a dirty air filter, incorrect thermostat settings, a malfunctioning thermostat, a refrigerant leak, dirty condenser coils, blocked vents or ducts, a faulty compressor, frozen evaporator coils, or electrical issues.
Warm Air from the Vents
If the compressor is fine, it will push cold air into the cabin of your vehicle. If you begin to notice warm or even hot air coming out of the vents, this is a clear indication that the compressor is not functioning properly.
Compressor clutch will not engage
With the AC off, the clutch does not spin. When you turn the AC on, the clutch can make a momentary click and starts spinning with the belt and pulley. If the clutch does not engage, or if it makes a screeching or whining sound when it does, the compressor needs to be serviced.