Accelerate Auto Repair

Auto A/C Repair

Summers in Texas can be brutal. The last thing you want is for the air conditioning to go on the fritz. As a preventative measure, you should have your car’s air conditioning checked at least once every year in the late winter or very early spring. Accelerate Auto Repair will check the heating and air conditioning system for you, including the compressor and hoses. Our ASE Certified technicians will check the pressures of the system to ensure your A/C doesn’t have any refrigerant leaks or mechanical problems.

Air Conditioning Components

Your vehicle’s air conditioning system is made up of several components:

  • Air conditioning compressor
  • High-pressure hose
  • Low-pressure hose
  • Accumulator or drier
  • Orifice tube (O-Tube) or expansion valve
  • Condenser
  • Evaporator


The refrigerant constantly runs through the system. Once a mechanic fills the system, usually, with R134A or R1234yf (R12 is no longer used on new vehicles), the compressor compresses the gas into a liquid. When this happens, the refrigerant is very hot. It then goes through the condenser, where it cools down.

The outside air that passes over the condenser’s series of coils cools the liquid. If your vehicle has a drier, the refrigerant then goes through the drier to absorb any moisture in it. It then goes through the expansion valve, which restricts the flow of the refrigerant and turns it from a high-pressure liquid refrigerant to a low-pressure liquid refrigerant.

If your vehicle’s air conditioning system uses an accumulator, you’ll have an orifice tube, which does the same thing as the expansion block. Then the low-pressure liquid goes through the evaporator. As it does, the blower motor pushes the air over the tubes in the evaporator, which are cold, then out into the passenger compartment of your vehicle.

The two systems have a slight difference in that if your vehicle has an accumulator, it is located between the evaporator core and compressor on the low side. The drier is located between the condenser and the expansion block on the high side.

Auto A/C Repair

The air conditioning system is made up of many components, so many things can go wrong with the system. It could develop leaks in the hoses or in any of the components, the compressor could fail, the o-tube or expansion block and drier or accumulator could develop a blockage, or the condenser could leak.

The only way to locate leaks is to fill the system with a combination of refrigerant and dye. The auto technician looks for the dye to locate the leak. If you must replace any part of the air conditioning system, you must also replace the drier or accumulator. 

Accelerate Auto Repair in Rowlett Tx A/C service and repair;image of a car air conditioning vent near steering wheel with blue haze to make it look like cool air blowing out

Most technicians highly recommend replacing the orifice tube or expansion block at the same time since they are prone to blockages.

Modern auto air conditioning systems are computer controlled and rely on many electronic components such as fans, relays, and temperature sensors. The control panel itself is a computer that networks with the other computers in the car to get the information it needs to cool the various “zones” in the car. Any of these components can fail, causing your car’s A/C to  function improperly. Our technicians are fully capable of diagnosing issues with the control side of your air conditioning.

Contact Accelerate Auto Repair

If your vehicle’s air conditioning system seems to put out warmer air than normal or doesn’t work at all, contact Accelerate Auto Repair at 469-501-5115 to schedule an appointment to diagnose the problem with the system and make the needed repairs.

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