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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 Avus Autosport, 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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What our clients are saying about us

We have established longterm and stable partnerships with various clients thanks to our excellence in solving their automotive needs!

I could not be happier with Avus! I just got my first car in California (a used Mini) and after recently getting engine oil alerts, I was panicking. Got a service and Sandro was extremely kind and thorough, explaining what would be needed and referred a tyre specialist. As a woman, it’s important to find a mechanic I can trust and I will be coming here going forward 🙌🏼 Highly recommend! quotes-image
, 07/17/2025
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Sandro and Andrew and the whole team have been a huge help over and over at Avus. They are very fair and accurate with their diagnostic and repairs on my nearly 40yr old BMW, and one of the few places that will be honest and up front with you about your options when it doesn’t make sense to repair the car. A+ talent and service, thank you for all you do!quotes-image
, 07/07/2025
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