Working Hours
  • Mon 8:00AM - 5:30PM
    Tue 8:00AM - 5:30PM
  • Wed 8:00AM - 5:30PM
    Thu 8:00AM - 5:30PM
  • Fri 8:00AM - 5:30PM
    Sat Closed
  • Sun Closed
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503-293-5386 | 7310 S Macadam Ave, Portland, 97219

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

Marque Motors

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 Marque Motors, 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


General Recall Info

Takata Recall Info


What Our Customers Are Saying

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You Guys Kick arse!! Thank for the work you do!! The power from 3K to 5K has improved and it has a quicker response. Great upgrade for the money!! Thaank you!!

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Marque Motors was recommended to me by several of my 'German Sport car owning' friends. Kurt was very generous with his time to help me understand the differences of the cars that I am researching to purchase (Porsche vs. Audi). He gave me some excellent pointers that I would not have thought about before pursuing a purchase. I will definitely bring the car to Marque for a full pre-purchase inspection when I identify it, and any service and repairs as well. I believe they are an excellent resource!

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I've taken a number of Porsches to Kurt over the past 15 years or so. They do careful work, give great advice, and have been very reasonably priced.

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I was recommended Marque Motors for a pre-purchase inspection on a Porsche Boxster in Portland. I don't live in the area and hadn't actually seen the car myself, so the inspection was really important to me. Kurt was great and gave me all the information I needed to make an informed purchase, taking time to explain the report details over the phone and answering any questions I had. The inspection also cost me less than I was originally quoted which was nice! If I was anywhere near the area, I'd definitely be going back to Marque Motors for any work my car might need in the future.

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We have been doing business with Marque Motors for a long time, this is a quality shop. All my customers that drive Porsches, BMWs, and Audis take their cars here and have nothing but GREAT things to say about their work. Kurt has a very good reputation and his staff knows what they are doing. Marque Motors is a full-service repair facility specializing in Porsche, Audi, BMW, MINI and Volkswagen. NOTE: SERVICE & REPAIR FACILITY SPECIALIST ! Service and Repair Shops that have been around a while are getting harder to find, this is one of the good ones. We are in the industry and my customers say this is a great shop, and I agree.

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Kurt and crew always have done what they say, when and for the amount agreed to. They serviced our 1999 Audi A4 for the last 13 years, and I would use them again, and recommend them highly.

  • Bosch Certified Service Center
  • ASE (Automotive Service Excellence)
  • World Pac
  • ALL-DATA
  • BG Products
  • Interstate Batteries
  • Total Oil
  • ORPCA (Oregon Porsche Club of America)
  • DEQ Too
  • Car Care Aware
  • Call Us For Service: 503-293-5386