AC is not working

The AC on my car is not working.
Experienced mechanics share their insights in answering this question :
Your air conditioning not working is most likely due to the refrigerant in the system being low. Over time the refrigerant will slowly leak out. You won’t be able to notice it because it is a gas. You will only notice when your air conditioning does not work. There is also a chance that a component in the system has failed causing the refrigerant to leak out. I would ask for help from one of the mechanics at YourMechanic to inspect your air conditioning system for leaks and recharge your refrigerant so your air conditioning will work again.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Mazda 6 ac isn`t working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. You may not realize there`s a refrigerant leak until the air conditioner stops blowing cold.
On average, the cost for a Mazda 6 Car AC Repair is $245 with $112 for parts and $133 for labor. Prices may vary depending on your location.
Your vehicle`s air-conditioning not working is most likely because of a bad compressor or a freon leak. While these might be the easy to spot reasons for your air-conditioner not cooling inside your car, it could also be anything as simple as a bad compressor belt or a dirty cabin air filter.
Dirty coils caused by a lack of annual maintenance. Dirty air filters, which restrict airflow. Clogged drain line, which can cause moisture buildup. Refrigerant leaks, which decrease cooling power.
Usually, it is a quick fix, but sometimes the failure can be caused by a much bigger problem. The most expensive part of an AC unit to replace and repair is the air compressor. Today, our AC Techs discuss everything you need to know about air compressors and why they are so expensive to repair!
The best part is, our Mazda 6 Expansion Valve & Orifice Tube products start from as little as $29.99.
Common Reasons AC Doesn`t Run Cold

The most common causes of broken air conditioning leaks or compression issues. If you are feeling cool — but not cold — air, the issue could be a clogged filter, a problem with the cooling fan, signs of radiator trouble, or it could simply mean it`s time to recharge your AC.

Look for it first around on the exterior of your machine, especially along the bottom edge near the ground. An AC`s reset button is typically red and visible, so it should be easy to spot. If you don`t see a reset button on the outside, it could be located inside the unit behind the service panel.
Although the average lifespan of a car AC compressor is between 10 and 12 years, the compressor clutch could fail earlier than that. Unfortunately, a failed clutch means you need a whole new compressor—they`re inseparable.
The actual leak repair depends on the component that`s leaking. A simple O-ring can cost just a few dollars plus labour, but a new air conditioning line or condenser can cost hundreds of dollars. All-in, you can expect to pay $150 to $500, on average, for a leak repair.
The average cost for a Mazda 6 AC Evaporator Replacement is between $815 and $1,203. Labor costs are estimated between $551 and $694 while parts are priced between $264 and $508.
On average, the cost for a Mazda 3 Car AC Repair is $245 with $112 for parts and $133 for labor.
One of the most common reasons your car AC is blowing hot air is because of a refrigerant issue—specifically, a loss of refrigerant. This loss of refrigerant can occur either due to a leak or because your car`s refrigerant levels are too low.
So, if your air conditioner isn`t cooling, and you suspect a refrigerant leak, or if you`ve checked the air filter and thermostat to no avail, yes, you should shut your air conditioner off and call us right away.
Typically, AC filters will either be located in return ducts or inside the air handler in your attic or basement. Return ducts can be in the wall, floor, or ceiling and have slatted openings where air passes through.
If you can hear the compressor running but the fridge isn`t cooling, the problem is most likely either frost-clogged evaporator coils or a stuck or broken evaporator fan. If you hear no sounds and the compressor isn`t running, or you hear a click, inspect the overload relay, start relay, and start capacitor.
After turning off the circuit breaker linked to the AC unit, wait for a full minute. Set a timer for 60 seconds and then return power to the AC unit. As a safety precaution, it may be a good idea to inform everyone in your household that you will be resetting breakers.
Simply stated, the automatic restart feature ensures periodic air conditioner operation to maintain humidity at a comfortable level, even though the room temperature may not have risen enough to cycle the unit back on. Thus there will never be more than an 8 minute “off” time.
When a thermostat is in recovery mode, this simply means it is recovering from being in an energy-saving mode. During recovery mode, your thermostat is working toward achieving a newer temperature that is cooler or warmer than the outside air.
Locate the high pressure switch near the compressor (a cylindrical device piped into the refrigeration system with two wires a red button on the top). Push in the button to reset. Push the rocker switch to restart the unit.
Your car`s air-conditioning stopped working most likely because of a freon leak or a bad compressor. While these causes may be the simple to spot reasons that your air-conditioning isn`t cooling in your vehicle, a dirty cabin filter or a bad belt could also be the problem.
If there is the voltage on the “line” side, test for voltage on the “load” side of the fuses by placing the meter`s leads on the load wire lugs. If you read voltage on this side(220-240V), this means the current is flowing through the fuse. If you get a zero-voltage reading on the load, this means your fuse is blown.
Overheating. Overheating is one common cause of air compressor failure. Kaishan uses oil cooling systems to remove the heat of compression, preventing heat buildup in our rotary screw air compressors. But overheating is still a risk when the air in the work area is too hot and humid.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Honda Civic 2008. AC stopped working suddenly and engine check light came ON for a day.Next day AC worked and no engine light.
ANSWER : Hi there. In both cases, when an AC system is not working and a warning light is coming on the dashboard, typically a professional mechanic will complete the same initial inspection, which is to download the stored error codes that triggered the warning light initially. This tends to give them an idea as to what is causing the problems. This could be something as simple as an electrical relay that is faulty or loose or an indication of a computer related "glitch". Either way, the best way to move forward is to have a professional mobile mechanic complete a check engine light inspection.

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My AC does not always work. If I fiddle with the blower knob I can ususally get it to work on the lowest setting.
ANSWER : Hi There,
It sounds like you may have a faulty blower motor resistor. The highest speed setting may still work because in most cars in the highest fan speed settings the current bypasses the blower motor resistor. In some cars, if the resistor is failed, the fan may stop working completely. Another reason a blower motor resistor may fail is when the blower motor has a mechanical problem or when a foreign object jams the blower motor fan blade and prevents it from spinning freely. This leads to increased current through the resistor and causes it to overheat and fail. I would suggest having an expert from YourMechanic come to your location to diagnose your system to determine what may be causing the fan not to work properly.

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My AC is not working took it the mechanic and he told me that’s it has a blown fuse box which is causing my AC not to work?
ANSWER : Hi there. I have not seen a fuse box fail very often on this vehicle. It is possible that he meant to say that the fuse for the AC is blown which makes a lot more sense. Most of the time when the AC fuse blows it is because the compressor is failing and has a short in the clutch.

The circuit is going to have to be tested for a short to confirm why the fuse blew. It can take some time to trace the wires, though it is probably the compressor. If you need to have this diagnosed, consider YourMechanic, as a certified mechanic can come to your home or office to inspect your AC system.

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My dash board don’t work my front light work when I change my light into high beam and my back window won’t go down
ANSWER : As unfortunate as it is, your vehicle would be considered flood damaged. Diagnosing electrical problems in a flood damaged vehicle is nearly impossible. This would take many hours or even days to determine which wiring harnesses and circuits have been affected. Then nearly all of the wiring under the dash would likely require replacement as well as many sensors and switches. On a BMW vehicle, the amount of wires and switches are likely more than that of a lower end vehicle. Due to the inefficiency in cost, you would likely be able to purchase another BMW like yours for less than what it would cost to fix your car. Many insurance companies would consider this type of damage to total out the vehicle unfortuantely.

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2003 honda odyssey cooling fans don’t turn on with AC, ac works while driving and shuts off when sitting still
ANSWER : If the fans are not working properly and consistently to cool and condense the refrigerant in the condenser, pressure in the system could rise high enough to trip the high pressure cut off switch, thus accounting for the compressor shut down. There is a control circuit for the fans and that circuit will simply have to be traced for BOTH voltage drops and continuity and, as well, proper function of the relays and any temperature sensors that might be in the circuit. The factory wiring diagram is essential. To obtain this diagnostic, and get the required repairs implemented, please request an a/c condenser control circuit inspection and diagnostic and the responding certified mechanic will get this resolved for you promptly. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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AC wont blow on max
ANSWER : Based on the information you provided for your 2010 Dodge Avenger. It is likely that you have a leak in the air conditioning system. You may also have a resistor pack going bad, or the selector switch itself could be going bad. To have the problem verified, a certified technician from YourMechanic can come to your home or office to detect any leaks and make needed repairs.

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Windshield wipers stopped working. They’ll suddenly stop working then suddenly start working again. Has been happening for a week.
ANSWER : The problem you are describing likely stems from an intermittent electrical fault in the wiper circuit. The windshield wiper system uses a small electric motor to move the wiper arms that you see on the windshield. That electric motor is controlled through a switch, relay, fuse, and wiring. One, or more, of those electrical components has failed although it is also possible that the mechanical arms are binding (seized, if the lubricant has dried out) thus causing the electric circuit to the motor to overload. Regardless of the underlying fault, if you request a non functioning wiper diagnostic/repair, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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My ac slowly stopped working after just two days.
ANSWER : The air conditioning system relies on a full system charge to function properly. A poorly operating air conditioning system is usually caused by a low charge from a leak. If the air conditioning compressor electronic clutch fails, the fuse blows or the relay burns out, you will notice the lack of cooling. The refrigerant inside the air conditioning system is a gas whose use and handling require a certification. Consider hiring an experienced technician like one from YourMechanic who can come out and give your vehicles air conditioning system a performance check which includes checking system pressures in an effort to offer you a more personal diagnosis.

Read Full Q/A … : AC is not working