A malfunctioning or underperforming air conditioning system can be a frustrating issue that affects your vehicle’s comfort throughout the year, but especially in the heat of the summer. Your car, truck, or SUV’s air conditioning system depends on several components in order to work properly. When one or more of these start to fail, the performance of your air conditioning system can diminish considerably. You can experience an air conditioning system that smells bad, doesn't blow cold air, produces weak or inconsistent airflow, or an A/C system that doesn’t blow air or cool your vehicle at all. This short video can help you diagnose the most common issues in your car, truck, or SUV’s A/C system.

0:00 Welcome Back
0:40 Air Isn't Cold
0:53 A/C Compressor Not Activating
1:12 Low Refrigerant
1:45 Clogged A/C System
2:20 Failing Blower Motor
2:57 Dirty Cabin Air Filter

Your vehicle’s air conditioning system is an integral part of keeping you cool and comfortable while driving. There are many components to a well-functioning A/C system, and if one of these parts fail, you may notice a change in the performance of your car’s air conditioner. If you notice that your truck, SUV, or car's air conditioner is blowing hot air or doesn’t blow air at all, if there’s a moldy smell coming from the vents, or if there is decreased performance from your A/C system, your vehicle may have an air conditioning  system issue. This helpful step-by-step video can help you perform the car air conditioner repair and diagnosis that your vehicle needs, and can keep you cooler while driving.

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[Air isn’t cold]
The most common indication your A/C isn’t working the way it should is that the air from your vents isn’t cold when you turn the A/C on. If you have airflow, but the air isn’t cold, there are a few possibilities.
 
The first possibility is that your compressor isn’t activating. This is easy to test, since you can see and hear the A/C clutch engage to turn the compressor on and off. But If your A/C compressor is running constantly, this could also be a sign that something in the A/C system isn’t working.
 
Another possibility is that you’re low on refrigerant, which could mean you have a leak. You have a few options when it comes to determining whether or not this is the case. An A/C leak detector has the ability to detect escaping refrigerant vapors. Refrigerant with UV dye is available, which can be used with a blacklight to locate leaks. A spray bottle filled with soapy water can be used as well. Since your refrigerant would be leaking as a gas, the soap would bubble up where the leak is occurring.
 
You could also have a clog in the system, either in the condenser, evaporator, or the expansion device. In that case, it may be necessary to perform some diagnostic testing using a set of A/C gauges, but if the A/C condenser seems to be overheating or smells like it’s burning… the A/C expansion valve is cold but the evaporator isn’t… or if you notice the A/C line going from the evaporator to the compressor isn’t warm… it’s possible the hoses or components could be clogged.
 
[Lack of airflow]
A lack of airflow may not be as much of a problem with the air conditioning as it is with the climate control system in general. Low or no airflow through the vents of your vehicle most likely indicates a problem with the blower motor system or the cabin air filter if your car has one.
 
A failing blower motor may prevent any air from moving at all, since it is what pushes air through the system. In some cases, it may only work on the lowest setting, if the blower motor resistor or switch has failed. In these cases, it’s best to check the fuse first, if there’s no air moving at all. Then, check the condition of the resistor… and the switch, as well as the blower motor itself… using a volt meter.

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