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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 Warren County Diesel Repair, 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

Great professional place to deal with. Lost my Driveline during a load so I called Warren County diesel services told them what was going on and they took care of it. They arranged a wrecker to pick my truck up, arranged transportation and a hotel room for the night while waiting on parts, and had me back on the road in no time. I highly recommend Warren county diesel they know what they are doing and how to treat customers right. Wish I lived closer I would take all my equipment to these guys. Great place to do business with. Thanks

Had to get my Wheel Seal replaced & had some wiring issues. They did a awesome job & Merit (Owner) & everyone else was nice & made u welcome. Thanks again for getting me back on the road!

Took good care of our vehicle. Could have screwed us and charged a lot more for more extensive repair, but made the simple fix and couldn't be happier! I'll be using these guys for any repairs we can't make in house going forward!

Can't say enough. Great guys, great work !!

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