Locally Owned and Operated Since 1995

Best Auto Repair, Petersburg

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 Mike's Garage and LaRocca's Towing, 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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Just had my car towed by you. It's a holiday weekend and no one really wants to work , but the guy that came out was AWESOME!! Very polite and very professional!!!! He definitely deserves a kudos from his boss!!!

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Locked my keys in car. My insurance sent them out to unlock it. I couldn't stay with the car since it was pouring rain. They unlocked it and called me to let me know it was done. Great service!

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Vehicle broke down approximately 20 miles from home, truck was there in 40 minutes. Thanks guys.

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