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 Greene's Truck Auto Service, 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 clients are saying about us

We have established longterm and stable partnerships with various clients thanks to our excellence in solving their automotive needs!

They are very efficient and trustworthy when it comes to auto repair. quotes-image
, 01/27/2025
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I took my car in for a cooling issue . I got the car back the next day and the issue seemed to be fixed. I got in the car to go to work the next morning and I had no heat and the temperature gauge was low. I took the car back to Greenes and they bled the air out of the coolant system. My thermostat is below my alternator on the bottom of the engine. (Gotta love foreign cars) Greenes truck and auto went above and beyond to fix my issue and bleed all the air out of my coolant system . It took several attempts but as I said that system is notorious for being a bear to bleed. I would highly recommend them . If for nothing else just for the fact that they made it right and got my car fixed.quotes-image
, 12/16/2024
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