There is nothing worse than trying to cut on your car A/C on the first warm day of the year only to get lukewarm air blowing or (even worse!) no air at all. The air conditioning system of a car is one of the most complicated systems on the vehicle, and services depend on what part of the A/C system is malfunctioning.
Servicing a car’s air conditioning system involves diagnosing the part of the A/C system that is not working, determining if the owner can service it, and then repairing the system. Car A/C problems can range from slow freon leaks to seized-up compressors and usually require a mechanic.
A/C repairs usually can’t be performed easily by the car’s driver, but in the case of a slow freon leak, you might be able to keep your car’s A/C functional a little while longer before a professional needs to step in and intervene. Keep reading and learn more about common problems with a car’s A/C system and how you can service them, as well as how to maintain your car’s air conditioning system.
Several aspects to a car’s air conditioning system may require maintenance at one point or another during the service life of the car, some more accessible to the driver than others.
When you look into servicing a car’s air conditioning system, you will typically run into problems in one of the following areas:
Because these components are often located deep in the guts of a car’s chassis and the engine compartment and sometimes require specialized equipment to repair correctly, these kinds of A/C repairs are usually left to an automotive repair shop rather than attempted at home.
There are some easy ways to figure out how bad your car’s A/C problems are with a little troubleshooting. Keep reading to determine what part of your car’s air conditioning system is malfunctioning and what you can do to fix it.
So, you go out to your car, turn the key, click on the air conditioning system, and—nothing. Perhaps there is hot air, which can feel even worse on a blazing summer day than no air at all. What do you do at this point? It depends on which symptom your car is presenting with.
If you turn your car’s A/C system on and there is no air at all, this could be a sign of several problems. The worst-case scenario is that the car’s A/C compressor dies. The relatively high cost of the parts involved in replacing this component, plus the intensive labor involved, means that you will likely end up spending between $1,500 and $2,500 at a mechanic’s shop to get your car’s A/C replaced.
If a car’s A/C compressor has quit, many mechanics will not replace the compressor without using a kit that also replaces other components of the A/C system, such as the condenser and drier-receiver. This is because a new A/C compressor can be damaged by debris from older or damaged parts in the air conditioning system once it is operated.
If a mechanic agrees to replace the A/C compressor without replacing the associated components of the A/C system, in many cases, they will do so on the condition of the A/C compressor, not receiving a warranty. With a part as expensive as an A/C compressor, it simply is not worth the risk.
If your car’s A/C is still blowing but is blowing hot or a little warmer than usual (and is not cooling, no matter the setting), your likely culprit is a leak in the freon system. A slow leak can usually be limped along by recharging the car’s A/C system once a year during the warmer months, but a more significant leak in the A/C system will prevent it from being able to hold freon at all.
While a car’s air conditioning system is designed to be a closed vacuum system, age can eventually affect the rubber, plastic, and metal components of a car’s air conditioning system until leaks develop as a result of dry rot and other factors. Sometimes a smoke or leak test can be run on the car’s A/C system to see if a specific hose is leaking. If a major leak is found in the system, the hose can then be replaced.
However, leaks in the A/C system are often slower and occur at disintegrating seals throughout the A/C system. This causes a slow freon leak in which the A/C gets gradually less and less cold until it stops blowing cold air entirely. At this point, the freon in the car’s A/C system must be refilled or recharged.
If air is still blowing through the car’s vents but does not feel as forceful as it should, this can be the result of the air cabin filter becoming clogged. Check the filter in the car’s engine compartment to ensure that it does not require replacement. Once a dirty, clogged cabin air filter is replaced, this can usually restore A/C airflow to the car’s cabin as long as other components are not defective.
A good time to have your car’s cabin air filter checked is during a routine oil change or a trip check. Mechanics can inspect the air filter and replace the filter as necessary.
Another issue that can crop up in the car’s A/C system is when cold air will blow out of one side of the car’s dashboard but not the other side. This is usually the result of an issue with the blend door actuator, a component in the car’s A/C system that mixes hot and cold air to achieve the required temperature of the A/C’s control panel.
The blend door actuator can be damaged by debris in the A/C system or can become bound because of age or broken linkage. This is one of the few parts of a car’s A/C system that can be repaired individually rather than as a systemic unit.
If your car is starting to blow a little warmer than you’d like, one of the first pieces of advice that you’re likely to encounter is that you need to “top off” your car’s freon. In older cars, this is usually the most cost-effective way to keep a car’s A/C system running for as long as possible without being forced to replace it entirely.
It is essential to keep in mind that topping off a car’s air conditioning system incorrectly can damage delicate components in the system and inadvertently cause a more expensive repair. Without a pressure gauge and the proper specifications, this is not a procedure that should be undertaken unless you have prior experience in automotive maintenance.
The safest way to get your car’s A/C recharged is to take it to a mechanic. Here are some typical aspects of a freon recharge service:
If your car has a slow freon leak, a mechanic will usually not just recharge the system with freon; they also add a paginated oil to the system that will show up under a UV light inspection if all of the freon leaks out of the system again. This will hopefully help mechanics discover the direct source of the freon leak and repair it for the next season when the freon leaks out again.
Consumer Freon leak detectors are available for those who want to identify if a leak is occurring.
Mechanics use two major tools other than direct observation to detect and diagnose freon leaks in a car air conditioning system:
In cases where a car’s air conditioning system is running completely hot, mechanics will typically try to discover the source of the freon leak before recharging the system. This is because if there is a significant leak in the A/C system, the freon will be almost immediately lost, and the mechanics will be right back to square one on the vehicle in a day or two.
Freon recharging kits available online and in automotive supply stores will allow you to recharge a car’s freon at home. While this might seem like a convenient alternative to taking your car to the auto mechanic, there are some significant risks involved with working on your car’s A/C system yourself.
The biggest risk of recharging your car’s A/C system at home is operator error—if you add too much freon or over-pressurize the system, it can permanently damage the A/C compressor. This can turn a thirty-dollar repair into a repair that costs more than the value of the vehicle in some cases. Depending on an individual’s experience in auto repair, this may or may not be a risk worth taking.
If you do decide to go about refilling your car’s freon on your own, it’s a good idea to read your car’s owner manual carefully and watch several online videos or read several tutorials on how to do it before attempting it on your vehicle. It is also better to attempt a first-time repair on a vehicle with a more experienced mechanic observing and helping out if you can swing it.
Once you decide you have enough automotive repair experience to attempt a do-it-yourself recharging kit, you can pick one up either online or at an automotive supply store. If you buy the parts of the recharging kit individually, you will need to buy two cans of refrigerant (r-134), a refrigerant dispenser, and a pair of goggles for safety since you’re working with compressed freon.
To recharge the freon in your car’s system, follow these steps:
To recharge a car’s air conditioning system on your own successfully, you must follow the instructions included with your refrigerant dispenser to the letter and make sure that you don’t over-pressurize the A/C system by accident. If you do, you might end up spending significantly more to get cold air for the summer than you anticipated.
There are several points in recharging a car’s air conditioning system where you can inadvertently cause damage to the A/C system. Here are some points to keep in mind when you are recharging your car’s freon:
It can be tempting to try to recharge a car’s air conditioning system yourself, especially if you are dealing with an A/C unit in an older vehicle that is not worth much. But unless you are willing to risk losing the air conditioning entirely, it is a good idea to leave A/C refills to the professionals unless you’re confident you know what you’re doing.
If your car’s air conditioning unit needs expensive service, you might wonder whether replacing the A/C in your car is even worth it. Ultimately, this depends on the age and condition of the vehicle, as well as the climate that it is driven.
You could likely find a car of equivalent value with a working air conditioner already for that amount of money. An A/C compressor kit is one of the most expensive repairs on most vehicles, so it is worth considering whether replacing the car entirely wouldn’t be a better option depending on the rest of the car’s condition.
When it comes to car A/C repair, the bottom line is that you’re likely going to need to contact an automotive technician to handle any but the most minor of car A/C repairs unless you already have some experience in automotive repair yourself.
A car’s A/C system can be one of the trickiest systems on the entire car to repair as a layman, and doing it incorrectly can lead to further damage that can potentially turn a job that costs a few hundred dollars in parts into a job that costs a few thousand instead. Most drivers do not have the level of experience to repair a car’s A/C system safely and effectively on their own.
However, there are many ways that the driver of a car can service their car’s air conditioning system to keep the system in good working order and minimize the need for repairs.
Here are some of the steps to ensure that a car’s air conditioning system remains working well:
Maintaining a car’s air conditioning system is much easier than trying to replace it, so it’s a good idea to prevent added stress on your car’s A/C if you can make it last longer.
Once a car’s A/C system is old enough to fail, the car itself is often comparable in value to the A/C repair. This can make repairing the air conditioning on an older vehicle a tough choice, especially when you could buy a used car for roughly the same price or put a down payment on a new one.
Because there are so many different components that can break down in a car’s A/C system, and many of them are difficult to access or observe properly without specialized tools and supplies, many services related to a car’s air conditioning system are better left to professionals. It is possible to recharge your freon using a do-it-yourself kit, but those who do this risk damaging their A/C system accidentally.
Luckily, the low cost of servicing a car’s air conditioning system with a freon recharge every few years is well worth it to keep your ride in cold air.
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