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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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What Our Customers Are Saying

Evans Automotive And Tire Center Reviews

As the owner of another repair shop I can not speak highly enough about the prompt to service and outstanding customer service they gave my customer! I called and spoke to Nate about a customer of mine that was stranded and broke down out of town, they took exceptional care of my customer while at their shop! Thank you from one shop owner to another!

Saint Augustine, FL

, 05/11/2026

Took my Monte Carlo for thorough inspection. They found some grounding issues and repaired them. My car is still running like new. Thank you all at Evans for the work you do!

Saint Augustine, FL

, 05/07/2026

They are super professional and honest about their estimates, I had a great experience with Evans I highly recommend!

Saint Augustine, FL

, 04/13/2026

I wanted to express my heartfelt gratitude for thee BEST Automotive Service I honestly have EVER had received.. I had an unfortunate experience before coming into Evans last Monday. I had decided over the weekend that I would stop in first thing Monday to see if they could assist me as I was scheduled to travel shortly and put faith that all would flow how it was to go. I was met by Justin who listened.. and took in all that I had asked of them to check out..and had ended up calling a few others times to add some extra things on.. as well as ‘checked in’ to see how things were proceeding. Understanding that at times.. when your car is being checked out.. you just might need to take care of something else.. which was the case …. I appreciated how that was handled.. professional.. and truly caring about the customer.. I was told Matthew was the main tech who worked on my car.. I want to acknowledge and thank him.. I truly APPRECIATE YOU.. your time.. care and hard work.. not just on my vehicle but daily.. as well as ALL who work at Evans.. YOU ALL make a difference and bring your care.. professionalism and knowledge to make the experience for the customer pleasant.. which means a great deal these days.. so thank you ALL.. When I had come to pick up my vehicle.. I was greeted by ‘Ms.Harley’ who definitely wanted to express her gratitude to me .. which made my day.. I’m a number person.. My vehicle is a 2013 GMC.. I bought it at 113,000.. my next oil change.. 123,330… PERFECT.. Thank YOU EVANS AUTOMOTIVE and TIRE CENTER.. I meant what I said.. THEE BEST Service I have EVER had.. I’ll be back.. for sure.. Blessings to you ALL..

, 03/28/2026

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