Working Hours
  • Mon 7:00AM - 6:00PM
    Tue 7:00AM - 6:00PM
  • Wed 7:00AM - 6:00PM
    Thu 7:00AM - 6:00PM
  • Fri 7:00AM - 6:00PM
    Sat Closed
  • Sun Closed
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540-663-3880 | 17061 Dahlgren Rd, King George, 22485

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

Dahlgren Garage

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 Dahlgren Garage, 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.

More AC Repair Services:

Truck and Car AC Repair Services

Freon Recharging Services For Your Car Or Truck

AC Evaporator Services


Our guarantee to you

What Our Customers Are Saying

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Mike and his team at Dahlgren Garage are the best. A rear tire on my rental car went totally flat in the course of a couple hours. I took it in after work and got it fixed right away. It was a bad tire stem (thanks, Hertz) and Mike pointed out another serious problem with a big gouge in the sidewall, which could blow if I was on the highway! Now, what is that Roadside Emergency number?

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Fantasticly kind, knowledgeable and trustworthy staff! The service was so wonderful as well. I will only come to Dahlgren Garage from now on.

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Everyone working there was great, and the service was a very reasonable price!

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The best friend my car ever had.

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Great local repair facility.

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Highly recommend this garage; knowledgeable staff that gave me a quote over the phone and didn't charge me a penny more. The other local shop I called wanted to charge me extra labor on top of a more expensive price to start. Another customer was talking about being overcharged elsewhere nearby as well. Don't throw away your money, go to the honest mechanics over at Dahlgren Garage.

  • Bumper To Bumper Certified Service Center
  • ASE (Automotive Service Excellence)
  • TECH-NET Professional Automotive Service
  • ASA (Automotive Service Association)
  • Amsoil
  • IDENTIFIX
  • Interstate Batteries
  • Mitchell1
  • Valvoline
  • Car Care Aware
  • Call Us For Service: 540-663-3880