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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 Jr. Auto 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.


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!

Jr. Auto Repair is one of the more honest mechanic shops that you'll find in Orlando. They're a small, independent, family owned company that doesn't try to pull the wool over your eyes like some of the bigger, multi-branch companies tend to do. To clarify, I had only moved into Orlando proper this week and was looking over my options. Not only did Jr. take a look at my car thorughly but gave me a list of what I needed and didn't need done after looking at the receipt we got from Mavis for an oil change -one of said larger mechanic chains- and gave us a far more reasonable price for the job on everything else that needed to be done and had even gave us a ride back to my apartment sense we had no other rides available. To top it all off, it was all done in the same day and I didn't find a single thing wrong with the car after the fact. Everything was where it was, keys were under the matt and the car ran smooth. He gave us an idea of what we'll need in the future several months from now, estimated price, etc. They're fairly nice and reasonable and I can certainly see myself coming back to these guys whenever I'm having issues with my car. Best of all, pretty close to where I live too. Wholeheartedly recommend this shop over bigger brands. As far as local mechanics go, you can't go wrong. quotes-image
, 06/14/2025
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This auto repair is the Bomb literally they have the best workers that cooperate nice and smoothquotes-image
, 06/12/2025
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ALL-DATA
Car Care Aware