Car AC Repair & Service

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Car AC Diagnosis & Repairs

It's the first hot day of Lubbock, TX. Perhaps it's March or even as early as February. Uncomfortably shifting in your seat, you turn on the Car A/C, only to feel an unwelcome blast of warm air streaming from the vents, a bad situation made worse. Warm air blowing through the vents is the most common issue and it could mean your car A/C unit isn't working at all. Typically when the A/C is turned on, you should hear a noticeable hum, is there any sound at all?

Other issues could be a vehicle A/C unit that is low on coolant or leaking. If leaking, McWhorter would stop the leak and refill your unit with freon.

All of these scenarios deserve a visit to McWhorter, your car air conditioning service and repair headquarters. Did you know that without regular maintenance a car air conditioner loses about 5% of its original efficiency per year? This means that without proper maintenance, your vehicle AC unit may be performing as poorly as other models that are years older! But there is good news: you can still recover most of that lost efficiency.

Schedule an appointment with McWhorter's ASE certified mechanics. We understand all aspects of car A/C repair, from modern computerized components to environmental disposal concerns. Today's vehicle A/C systems are fairly complex and new improvements are always being initiated. The following is a brief schematic of some of the basic components that comprise a vehicle's AC system:

  • The compressor is a belt-driven device that derives its name from compressing refrigerant gas and transferring it into the condenser. While basically acting as a simple pump, the compressor is the core of your vehicle's air conditioning system.
  • The condenser's primary function is to cool the refrigerant. It is a heat dissipating apparatus that radiates heat released by compressed gases and condenses them into high pressure liquids. The location of your condenser depends on how new your car is, but typically it's found at the front of the vehicle, directly in front of the engine cooling radiator.
Receiver (Drier):
  • The receiver is a metal container that serves as a storage receptacle for the refrigerant. It's also referred to as a drier because it absorbs moisture from the refrigerant and filters out particles of debris and harmful acids that would otherwise harm you A/C system. Commonly located on the liquid line of the A/C system, you should change your drier every 3-4 years to ensure quality filtration and prevent any damage caused by these detrimental chemicals.
Orifice Tube/Expansion Valve:
  • The orifice tube (also known as the expansion valve) is a controlling mechanism that regulates the flow of refrigerant throughout the system. In addition to this, it also converts high pressure liquid refrigerant (from the condenser) into a low pressure liquid, so that it can enter the evaporator. Generally located at the evaporator inlet, the orifice tube could also be found between the condenser and the evaporator, or in the outlet of the condenser.
  • The evaporator is designed to remove heat from the inside of your vehicle; therefore it's a heat exchanger that's vital to your vehicle's A/C system (not to mention your comfort). The evaporator allows the refrigerant to absorb heat, causing it to boil and change into a vapor. When this occurs, the vapor is removed from the evaporator by the compressor, cooling your car and reducing humidity. Because the evaporator houses the most refrigerant in this heat transfer process, it is the most susceptible to corrosion by harmful acids. Usually this damages the evaporator beyond repair, which is why it's imperative you see us to prevent this from happening.

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