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    Tue 7:00AM - 6:00PM
  • Wed 7:00AM - 6:00PM
    Thu 7:00AM - 6:00PM
  • Fri 7:00AM - 6:00PM
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608-244-9040 | 3712 Milwaukee St, Madison, 53714

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

Midwest Engine Service

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 Midwest Engine 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.

More AC Repair Services:

Truck and Car AC Repair Services

Freon Recharging Services For Your Car Or Truck

AC Evaporator Services


Our guarantee to you

What Our Customers Are Saying

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I am from IL and was going to our home in Northern Wisconsin when I experienced car trouble. Lucky for me, I got off at the first Madison exit. I called Midwest Engine Service. They were AWESOME! They had me towed to their shop. Clean building and great staff. They got me back on the road within 3 hours. The repair bill was very reasonable. I would highly recommend this auto repair facility!



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I cannot begin to tell you how very much I appreciate the INCREDIBLE service I received from your staff ! I have been in the customer service business for over 30 years, I certainly have no problems recognizing EXCELLENT SERVICE and let me tell you your team GETS IT. From the helpful phone call to your shop when I was stranded at Home Depot to the tow truck driver calling to confirm to me that my truck was picked up...I will not ever take my truck anywhere else and you have a customer for life. I will tell everyone I know to do the same. Keep up the good work!

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To all of you -a BIG- thank you for all the time and effort you put into my car! I don't really know all the things you do but its much better now. The steering is better, the breaks feel better, and in general it just feels better to drive!

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Dear Wayne, Thank you for your note regarding my Audi TT alignment mishap and for being so noble as to stand behind the work done at Midwest Engine. I'm sure it is difficult at times, when trying to run a business well, to negotiate mishaps, both with customers and your staff, and I appreciate that your rose to the occasion and did the right thing by me, even as a cost to you.

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Thanks for the fast service and getting me in right away.

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You not only delivered what you said you were going to in the time you quoted, you went out of your way to fix two additional items for us, offered us a rental car and came in with a fair price.

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  • Call Us For Service: 608-244-9040