Working Hours
  • Mon 7:30AM - 5:30PM
    Tue 7:30AM - 5:30PM
  • Wed 7:30AM - 5:30PM
    Thu 7:30AM - 5:30PM
  • Fri 7:30AM - 5:30PM
    Sat Closed
  • Sun Closed
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802-652-9991 | 65 Elm Court, Colchester, 05446

Replace Your Car's AC Thermal Expansion Valve or Orifice Tube

MasterTech Automotive

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 MasterTech 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.

More AC Repair Services:

Truck and Car AC Repair Services

Freon Recharging Services For Your Car Or Truck

AC Evaporator Services


What Our Customers Are Saying

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I showed up first thing in the morning and was greeted by Keith. He said good morning and asked how he could help. I explained my situation with my car and listened and stayed calm and said that even though they were busy he would work it in and check back at the end of the day. I get a notification midday that the car was done! He picked me up in my car!! No smoke and mirrors, straight talk from Keith! The best service I've experienced from a repair shop. He dropped me off and picked me up. He was knowledgeable and stayed calm. If I need the car serviced again, I'm not calling anyone else.

, 07/13/2021

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I wanted a second opinion on fixing the convertible top on my older BMW. I am so glad I did. Keith researched the issue and fixed it quickly and reasonably. I would recommend this garage to anyone.

, 05/18/2021

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Fast and friendly service, at a nice price. I'll certainly recommend them, and return for any other work.

, 05/10/2021
I dropped my car off at Master Tech in Colchester to have my snow tires taken off and the regular tires put on. I left a note asking if he could help with the battery. Keith called me first thing the next morning and said he would drop my car off at my home and charge my car battery for me. Talk about service..........I have always been happy with the mechanical and customer services at MasterTech and I highly recommend Keith.

, 03/24/2021
These guys are absolutely wonderful! Everyone was very helpful, kind, and no-nonsense. I will definitely be going back for any future work I need done, and highly recommend this place.

, 11/23/2020
Keith and the crew at Master Tech are fabulous! Always able to get you in, very knowledgeable mechanics and most importantly - FAIR & HONEST! Couldn't ask for a better group of folks! Thank YOU!

, 06/19/2020
  • ASE (Automotive Service Excellence)
  • CARQUEST
  • Jasper
  • TECH-NET
  • World Pac
  • Elf
  • Interstate Batteries
  • Car Care Aware
  • Call Us For Service: 802-652-9991