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

Alpha Auto Center


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 Alpha Auto 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.

More AC Repair Services:

Truck and Car AC Repair Services

Freon Recharging Services For Your Car Or Truck

AC Evaporator Services


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I've been taking my vehicles to Alpha Auto for 2 years. You will not find any better service and expertise than David and his staff. They treat your vehicle as their own. Prices are excellent. Looking for a trustworthy automobile shop, Alpha Auto is it. My name is Jeff S and I approved this review!!

, 08/06/2021

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My girlfriend and I always take our cars here for oil changes and tune ups. The crew there is always friendly and chats us up, and they work fast so we're in and out. Great place.

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Great service. Nice guys. I come here for all of my automotive needs.

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