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 The Plains Tire & Auto, 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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My car died on the interstate a few miles away, and my car was towed here at 4PM on a Friday. They we so fantastic and helpful. They got me right in and got me the information I needed to make decisions quickly. They bent over backwards to ensure I was taken care of. Such great friendly people, and as terrible as it is having car trouble, I am thankful that Brandon and the Plains Auto team were the ones who were able to assist me. quotes-image
, 06/04/2023
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I was stuck 3 hours from home with a flat tire and a stripped lug nut. They got the lug nut off and put my spare on for me very quickly and had me back on the road in minutes!!! Roadside repair couldn't even help me but these guys did!quotes-image
, 02/23/2023