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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 Car Doc On The Island, 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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Testimonials

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While being in dire need of a new car battery, we stopped by CarDoc on Venice Island. Stacy and Desiree quickly fit us in. Everyone was friendly and helpful. The battery was replaced and we were on the road in just a short time. It is a very clean and organized shop. We will definitely be using them for all our auto needs.
~ , 09/01/2025
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Wish I could give more stars!! As a female it can sometimes be difficult to find a car service place you can trust, so I am extremely grateful to have found Car Doc! Desiree & Stacy were so kind & welcoming, they got me in right away & made sure I understood everything they were doing to my car. This is the only place I will go to from now on, highly recommend!!!!
~ , 08/30/2025
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