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Replace Your Car's AC Thermal Expansion Valve or Orifice Tube


Your car or truck's AC system is under extreme pressure and the thermal expansion valve or orifice tube monitors the amount of pressure and the temperature of your A/C system. It calculates the precise amount of refrigerant that can safely go into the evaporator. A failing expansion valve or orifice tube often causes a vehicle's air conditioner to blow hot air.

Replace or Repair

  • Expansion Valves: Too much refrigerant causes your evaporator to get too cold whereas too little refrigerant would result in inadequate cooling. The expansion valve is a complex valve that regulates refrigerant flow. This process of metering the refrigerant adjusts the flow according to the temperature of the refrigerant in the evaporator coil. Talk to one of the pro mechanics at Evans Automotive & Tire Center, as this part can be replaced on its own and does not require the entire replacement of the AC assembly.
  • Orifice Tubes: Unlike the expansion valve, the orifice tube is a simple fixed device with no moving parts. It therefore cannot vary the flow of refrigerant into the evaporator, but rather causes a permanent restriction in the system. However, like the expansion valve the orifice tube regulates refrigerant flow through the system and filters debris which may come through in its screen. Often fixing a "bad orifice tube" requires replacing the entire evaporator assembly.


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OUR REVIEWS

 (187 Reviews)
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I cannot say enough good things about Nate and the entire staff at Evans Automotive. I have a vehicle with 26 inch rims and finding good tires seems to be very difficult. After an insanely bad experience with a tire shop in Jacksonville, Nate and the team at Evans went above and beyond to help me get my vehicle situated. They thoroughly made sure I was pleased with the ride and continued to check up to make sure everything was still good, well after the install. As long as I'm living in St Augustine, I will not take any of my vehicles anywhere else.

, 05/03/2025

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