Automobile maintenance

Why is my AC Blowing Hot Air In my Car

Why is my AC Blowing Hot Air In my Car
Written by Autofot
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A car’s air conditioning system is designed to keep you cool and comfortable. So, if you find yourself sweating in your car on a hot summer day, then something must be wrong with your AC. There are so many reasons why my ac is blowing hot air in my car. No gas could cause my car ac blowing hot air in the car


When you turn your air conditioning unit on and it doesn’t cool, you might be wondering why. Having your AC blow hot air in your car is a frustrating experience that requires checking your car’s components. There are many things that can cause this issue, but the most common are problems with the compressor and refrigerant or an improperly adjusted thermostat.

The compressor

The compressor is the most important part of your AC system. This is because it’s the part that actually makes cold air! It’s also the most expensive and likely to fail. Because of this, you should always make sure to keep your car’s AC system in good shape by routinely checking on its components.

The refrigerant

The refrigerant is the most important part of your AC system. It helps to cool the air by absorbing heat from inside your car and releasing it outside through your vents. However, if this gas leaks out, it can cause an entire host of problems for your vehicle’s AC system.

The refrigerant is under pressure and will leak from any hole or crack in the tubing that carries it through your car’s AC system. If you are losing refrigerant on a regular basis, there is most likely something wrong with one of three things:

  • The compressor (the part that pumps out the hot air)
  • The condenser (where heat is absorbed back into our car)
  • The evaporator (where cold air comes out).

The condenser

The condenser is the part of the AC that cools down the refrigerant. The condenser is located outside your car and has a big fan inside it that pushes air over coils that heat up and cool down as they pass through them.

The condenser is one of the biggest parts in an AC system, so when something goes wrong with it, you’ll know immediately from how hard your AC works or doesn’t work at all. It can be clogged or dirty from dirt or leaves falling into it when you had your windows down during a road trip, or if you spilled something on it at some point in time (like me).

The expansion valve

The expansion valve is a part of the AC system that controls the flow of refrigerant from the evaporator to the compressor. It’s usually located behind your car’s radiator, though it can also be found in many other places. The expansion valve is often overlooked when troubleshooting an AC problem, but it can be one of the most common reasons why your AC blows hot air. Read Also : How to Change Battery in Lexus Key Fob

The purpose of an expansion valve is to maintain a constant pressure between two points in your car’s refrigeration cycle by controlling how much refrigerant flows back into your vehicle’s climate control unit after being cooled by outdoor air passing through its evaporator core. If your expansion valve isn’t working correctly or if its seals are damaged, then there may be too much or too little pressure within these components—and this will affect how well they work together as well as their ability to cool down inside temperatures effectively during summer months when you need them most!

The evaporator

The evaporator is what actually cools the air that is blown into your car. If it becomes damaged in any way, then this can cause your AC to blow hot air into your car.

One common cause of damage to the evaporator is a leak in its freon lines. Freon is a refrigerant gas that helps cool down the system and make it work properly; when there’s a leak, however, the gas leaks out and isn’t available for cooling anymore…and that’s why you’ll get hot air blowing through!

Having your AC blow hot air in your car is a frustrating experience that requires checking your car’s components.

Having your AC blow hot air in your car is a frustrating experience that requires checking your car’s components. First, check the temperature of your engine and see if it’s too hot or cold. If it’s normal, then you should check:

  • The condenser
  • The compressor
  • The evaporator core

If your compressor is broken, then your air conditioner will not work. The compressor is the heart of the AC system. It pumps refrigerant into the condenser, which cools down and condenses out of a gas into a liquid. The liquid refrigerant passes through a tube to the evaporator where it vaporizes (becomes gas again) and circulates through your car’s cabin cooling off occupants and blowing cool air around them.

Your cabin filter may be clogged

If your cabin filter is clogged, then there’s a good chance that the air conditioning will blow hot air.

To check if your car’s cabin filter is clogged, you’ll want to take off the front dashboard trim panel of your vehicle. You can do this by removing the screws that hold it on and pulling it off. Once you’ve removed the trim panel, unscrew the glove compartment door and look for an access opening next to where it was mounted (usually toward one of corners). Remove this plastic cover and locate another small plastic cover behind it. It should be located near where you removed the glovebox door earlier; if not, just replace everything back together again until they match up correctly. Next, pull out this small plastic cover carefully so as not to break any tabs or damage anything else around its perimeter—this can be tricky since there are often multiple tabs holding it in place at different angles depending on which vehicle you’re working on! Once removed successfully though with no broken parts left behind (hopefully), take a look inside yourself with some sort of light source nearby so as not to blind yourself when looking down at what should hopefully now appear clearly within reach after removing all those other pieces first before reaching here….

Your condenser is dirty

Your condenser is a heat exchanger. It’s the part of your AC system that cools the air blown through it so that it can be recirculated inside your car, and it’s the part that’s exposed to the outside air. That means it can get dirty from pollen, dust and dirt in the environment—and if your condenser gets dirty, then it cannot properly cool your car’s interior.

To check whether or not there are signs of debris caked on your condenser fins (the “fins” you see on one side), look at them with a flashlight at night while they’re running: If you notice black smudges or streaks on any surfaces near where air flows through, then those surfaces need cleaning right away!

A motor or blower fan may have gone bad

It is possible that the motor or blower fan has gone bad. The motor and blower fan may need to be replaced, serviced, or cleaned.

A faulty expansion valve

Your car’s AC system is a complex network of parts that work together to cool down the interior of your vehicle. One of these parts is an expansion valve, which helps regulate airflow into the cabin. If your AC system isn’t cooling as well as it should be, it could be that something has gone wrong with this part.

What Is An Expansion Valve?

The expansion valve (also known as an EVAP solenoid) controls how much refrigerant flows through your car’s air conditioning system. It does this by regulating the amount of pressure in each section of the refrigeration cycle: low-side suction pressure and high-side discharge pressure. When these pressures are too high or too low, it can lead to problems like overheating or undercooling—or even damage to other components like compressors or condensers! The overall goal here is for there not to be any excess movement between gas molecules during compression; this means that there needs to be some sort of resistance between them so they don’t get crushed together when going through those cycles repeatedly over time (which could cause corrosion). Read Also: Major Causes of Engine over heat And What You Must Do

Always check your ac before going on a trip.

Check your AC every month, 3 months, 6 months, year and so on depending on how many times you drive your car or truck each year.

You can also take it to any mechanic or repair shop and they’ll be able to give you an estimate of when you’ll need to replace it next based on the age of your vehicle and other factors affecting its condition (like whether it’s been in an accident).


If your car is blowing hot air, it can be a very frustrating experience. One of the most common causes of this problem is an air conditioning compressor failure. However, before you take your vehicle to a mechanic or call them out to look at your vehicle, you should check that all the other components are functioning correctly first. This will allow them to pinpoint exactly where the problem lies and what needs replacing.

Hopefully, this article has helped you understand the various components that can cause your AC to blow hot air in your car. If you’re still having trouble with this issue, don’t hesitate to call a mechanic or look up additional information online; they’ll be able to help you find the right solution.

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About the author


Autofot is a website that blogs on the importance of taking good care of our automobiles. Little things that are ignored matter the most, hence we try to educate car owners and other different auto owners on how to go about taking care of their cars with little or no cost.

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