Car ac not blowing cool air

9 possible reasons why your car AC is not blowing cold air

Your car AC may not be blowing cold air for a variety of reasons. Recharging your car’s AC refrigerant or fixing a refrigerant leak could resolve the issue, but complex electrical climate control repairs or a slipping compressor clutch may be necessary to get your air conditioning back to full efficiency.

Car ac not blowing cool air

Because of where the hoses and lines are located, the air conditioning system in your car may be complex. The refrigerant is basically compressed and heated by your car’s air conditioning system before being allowed to decompress and condense into a liquid, which causes it to lose heat quickly. To get the temperature you want, you must repeatedly repeat this process, which absorbs heat from the car’s interior.

Today, we’ll be looking at the most common and possible reasons why your car AC is not blowing cold air.


9 reasons why your car AC is not blowing cold air

Reasons why your car AC is not blowing cold air include:

  • The AC system is empty and needs to be recharged.
  • Refrigerant leak in the AC system.
  • Failing Cabin Filter.
  • A malfunctioning air conditioning control unit.
  • Damaged AC condenser.
  • A Faulty AC Pressure Switch.
  • Faulty AC compressor clutch.
  • A malfunctioning AC compressor.
  • Damaged condenser fan.

The AC system is empty and needs to be recharged

The requirement for a recharge is the most common reason why a car AC doesn’t get cold enough. You can recharge your refrigerant yourself, but it will save you time and ensure that the job is done properly if you schedule an appointment with your local, reliable auto shop.

Refrigerant leak in the AC system

A refrigerant leak is another possible reason why your car AC is not blowing cold air. A refrigerant is added to your air conditioner to ensure that the entire system is functioning properly. When the car is running, the pressure of this refrigerant system, which is high, can exceed 15 bars.

Both this pressure and a specified quantity of refrigerant are necessary for the AC system to function effectively. If there is a leak in the AC system, the pressure will gradually decrease until it eventually stops functioning altogether.

Failing Cabin Filter

The air that enters the vehicle’s air conditioning system is filtered by a cabin air filter. The filter can eventually become clogged since it gathers all of the dust and contaminants that enter the user area. Additionally, a clogged cabin air filter affects the cooling efficiency of the air conditioning system. It is advised to regularly inspect and replace the cabin air filter.

A malfunctioning air conditioning control unit

Another common reason why your AC is not blowing cold air is a malfunctioning air conditioning control unit. When the air conditioning control unit malfunctions, it can give the blend door actuator the wrong signal, causing it to blow hot air instead of cool air.

Damaged AC condenser

Heat is transferred from the evaporator inside the vehicle through the condenser, which is installed at the front of the vehicle. The AC condenser is typically installed in front of the radiator, putting it in a position where it is highly susceptible to damage from flying stones and other objects. This frequently results in the AC condenser starting to leak refrigerant, causing the refrigerant to flow out.

A Faulty AC Pressure Switch

Your car AC may not be blowing cold air as a result of a faulty AC pressure switch. The high-pressure side and the low-pressure side of the air conditioning system are controlled by two AC pressure switches in your car for safety reasons. For safety purposes, the AC compressor won’t continue to cool the system if the pressure rises too high.

The AC compressor will also stop working if the pressure drops too low. Your AC system won’t work at all if this AC pressure is faulty since it may send the compressor faulty signals to stop, even if it shouldn’t.

Faulty AC compressor clutch

Inside the air compressor, certain car compressors utilize a clutch. When you turn on the air conditioning, the clutch connects the air compressor to the pulley, which is powered by the serpentine belt. By causing the AC compressor to spin, the AC system is powered.

The AC compressor may not even turn on if this clutch is too worn. In many AC compressors, this clutch can be changed, or you can even remove shims to make the clutch work a little bit harder.

A malfunctioning AC compressor

Not only may the AC compressor clutch be harmed, but the compressor could also fail which will cause the car AC not to blow cold air. For the air conditioner to function properly, the compressor must pump refrigerant all through the system. Your AC system will blow hot air if the pump fails and eventually stops pumping at all.

There may be metal pieces all over the place if the AC compressor fails; therefore, you frequently have to flush the entire AC system afterward.

Damaged condenser fan

A damaged condenser fan can also be the reason why your car AC is not blowing cold air. For proper heat removal, wind must pass through the condenser. We require a fan for this that can operate in place of the wind at slower speeds. The AC system at lower speeds could have an issue if this fan breaks down. There may be an issue with the condenser fan if you find that your air conditioner is running at higher speeds but not at lower speeds.


Why is my AC running but not blowing cold air in my car?

Leaks or compressor problems are the two most common reasons for failing air conditioning. If your air conditioner is blowing cool air but not cold air, the issue may be a clogged filter, a malfunctioning cooling fan or radiator, or it may just be that your AC needs to be recharged.

Why is my AC blowing but not blowing cold?

The refrigerant may be the cause of your central air conditioner’s failure to blow cool air. The system can be low on refrigerant and require more to be added. A leak is the most likely reason for this. A leak not only prevents the air conditioner from cooling effectively, but it can also lead to additional problems inside the car.

Can a car AC compressor be running but not cooling?

There may be an obstruction in the orifice tube (located in the high-pressure hose between the condenser in the radiator’s front and the evaporator located in the back) if the refrigeration circuit appears to be functioning (refrigerant in the system, compressor running, building pressure), but there is still no cooling.

What are the signs of an AC compressor going out?

  • The compressor is not engaging at all.
  • The outside unit shakes when it starts up.
  • The AC system is blowing warm air.
  • The system keeps tripping the circuit breaker.
  • Unusual noises from the outside condensing unit.

Can I replace my AC coil myself?

Yes, you can. It can take four to eight hours to remove and replace the evaporator coil. You must have the air conditioning system recharged after the evaporator coil has been changed.

How long do AC coils last?

Over time, your evaporator coil will experience wear and tear, just like any other component of your cooling system. Throughout the coil’s life, efficiency steadily declines, but with routine maintenance, your evaporator coil could last up to 20 years.

Is it worth it to replace an AC coil?

For the first 10 to 12 years of its life, an AC unit runs at its most efficient level. However, if your AC is close to 8 years old, simply replacing the evaporator coil is not worth the money. It would be like installing a brand-new engine in a car that is on its last legs.

Are coils easy to replace?

A failed ignition coil can be simply replaced at home, but you must first disconnect your battery because you’ll be working with high voltages.

What causes AC coils to fail?

Condensation pan rust or a clogged drain line are the two most typical reasons for evaporator coil leaks. There are many different things that might clog the drain line, including insects, mold, and debris, which leaves the water flowing off the condensation coil with nowhere to go.

How often do coils need to be replaced?

If you vape frequently but aren’t a strong user, it might last a week or two. Casual or irregular vapers may discover that they just need to change their coils every four weeks. Regardless of your vaping preferences, you ought to think about E-cig Coil Replacement at least once a month.

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That is all for this article, where the common and possible reasons why your car AC may not be blowing cold air have been stated and discussed.

I hope this content was helpful. If so, kindly share it with others. Thanks for reading; see you around!