AC is not working inspection

At its most basic level, a vehicle’s air conditioning system works by intentionally manipulating the temperature and pressure of refrigerants and the direct relationship they have. The process begins with creating high-pressure gas by compressing the refrigerant inside your vehicle’s AC system to raise its pressure and temperature. The refrigerant then flows through the condenser, which turns it into a hot high-pressure liquid before going into the receiver. The receiver – sometimes referred to as a dryer – removes moisture and unwanted particles from the refrigerant. After that, it passes into the expansion valve, or orifice tube, which reduces the refrigerant’s pressure and causes the liquid refrigerant to change its physical state into a cold low-pressure gas. To perform this change of state from liquid to gas, the refrigerant must have “latent heat,” and it must take that latent heat from the surrounding area inside the evaporator. The blower motor sends the cold air through your vehicle’s vents as the latent heat is pulled from the evaporator core to almost below freezing. Think of a hot summer day, and you just got out of the pool: The liquid water on your skin starts to evaporate and turn into water vapour. The cooling of your skin is the result of the water pulling the latent heat away from your body to change its state into a vapour.

Note that all of these parts are universal for any vapour-cycle AC system, but the way the refrigerant is metered, controlled, and restricted will vary from manufacturer to manufacturer.

Although a malfunction in any part of your AC system can cause it to underperform or stop working altogether, certain issues are common culprits. Low refrigerant is a common concern. However, since the refrigerant is recycled through the air conditioning system, the most likely way it can be lost is through a leak in one of the parts. Simply replacing the refrigerant will not solve the root of the problem.

Worn compressor: If your air conditioning suddenly stops working or starts making strange noises, the compressor may need to be replaced. A faulty compressor can also cause oil or refrigerant leaks, which a qualified mechanic can detect with dyes or a special infrared sniffer that can identify chlorofluorocarbon (CFC)-based gases. Broken condenser: When your air conditioner blows air but it’s not cool enough, this can indicate problems with the condenser, although issues with the electric cooling fan or fan clutch could also be responsible. Typically, road debris causes damage to the condenser’s cooling fins and passage tubes, while internal debris prevents proper condenser function by restricting the flow of refrigerant and increasing high-side pressure. All of these cases result in a diminished ability for the condenser to transfer heat. Faulty blower motor or resistor: If the AC system makes noise when you turn it on, but doesn’t push air through your vents, or if the blower only operates at maximum speed, the blower motor or resistor may be responsible. Damaged receiver/dryer: If, in addition to your air conditioner not blowing cold air, moisture is accumulating on your windows that aren’t resolved by defrosting, the receiver is likely in need of replacement. This should be done as soon as possible because an excess of moisture will quickly damage other AC system components. Blown fuse: Sometimes, the simplest thing to fix can wreak the most havoc. So, it’s wise to check the fuse that controls your air conditioning before assuming the worst. However, simply replacing the fuse without exploring other symptoms can mask the root problem and cause further damage. If you find a blown fuse, take your car in. The mechanic working on your car may need to perform electrical tests to find the high resistance in the circuit and solve the problem that resulted in the blown fuse.

Hydraulic problems under the hood include a lack of refrigerant, too much refrigerant, a lack of adequate compression, or a lack of a refrigerant control device. Electric problems under the hood include the AC clutch coil, clutch relay, high-pressure cut-off switch, low-pressure cut-off switch, or circuit protection device. Electrical problems in the dash include the AC switch not working, the computer control head or module going bad, or issues with the blend door command motor. Mechanical problems in the dash, such as the blend door being physically broken, prevent it from forcing air across the evaporator; the mode door is broken, which prevents it from forcing air through the vents; or the recirculation door being broken and falling into blower motor.

A top-rated mobile mechanic will come to your home or office to determine the source and cause of the AC malfunction. After the inspection, the mechanic will provide a detailed report that describes the air conditioning issue, along with the scope and cost of the necessary repairs.

The mechanic will perform a visual inspection of the air conditioning system, check the refrigerant for the proper charge, use a sniffer to identify any leaks of CFC gas, test the heater controls to make sure the air is being directed across the evaporator and sealing off the heater core, and then check other system components as specific symptoms and issues are identified.