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 Skyline Automotive, 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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I took my car in on Thursday. It was ready Saturday. They fixed the harmonic balancer on my 1982 Ford LTD. My car runs better than before. I highly recommend Skyline Automotive! They gave me a 2-year/24,000 mile warranty. My new place for all my automotive needs!
Definitely recommend - especially for European cars. Maciek at Skyline Automotive is a great mechanic - honest and professional. I purchased a Range Rover via an Internet auction and flew into Little Rock from South Carolina to take delivery of it. When I picked it up, it had a transmission leak and the transmission had also been overfilled by the prior owner. I needed to get on the road that day, and was lucky to have found Maciek through a referral by AAA. He quickly diagnosed and repaired the leak even fabricating a clamp that we needed to get me on the road that day. He checked the car over for us to ensure that we could make the 1000 mile drive. Our trip home was uneventful (mechanically speaking) and he even called me the next morning (Saturday) to check in to see if everything was OK. If I lived in Little Rock I would make this shop my regular mechanic.