Steve's Car & Truck Services
Replace Your Car's AC Thermal Expansion Valve or Orifice Tube
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 Steve's Car & Truck Services, 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.
OUR REVIEWS
Tires, near Lake Mills, WIBarbro Andren , 05/29/2025I was in Lake Mills this morning running an errand. I live in Cambridge (which by the way it’s not on your drop-down list. It’s only about 10 miles away so definitely worth the drive.) Anyway I was driving through town and my tire light went on. I pulled into a gas station and their tire gauge was broken, but the guy there said to me “See that building over there?” I said yes, and he said “Go over there. They’ll help you. He’s a really nice guy.” So I drove over to the back of the building, (Steve’s) and I ran into a really nice guy (Steve) working on a car at the back of the shop. I asked if he could help me, and he said sure, just go have a seat upfront, and indicated he’d take a look at it as soon as he could. They were crazy busy. I’ll be here for awhile, I thought. I went up front and explain my dilemma to Cassy in the front office. I was planning to leave at 7 o’clock tomorrow morning to drive to St. Louis, but when Steve, within minutes, showed me the size of the hole in my tire. I knew that was not going to happen. I have a Volkswagen Tiguan, four-wheel-drive, and tires are not easily found. But Cassie was on it and located some that could be delivered and put on the next morning. Meanwhile, Steve put my spare limper tire on, and all the while I was talking back-and-forth with a service guy at my car dealer in Madison. I learned my tires were under warranty and that my roadside assistance would take care of it (whew) but only if the work was done by them in Madison. I asked Cassy what I owed them, and was tempted to pay them double just to make myself feel better. It was beyond reasonable. I thanked Steve and Cassie profusely and actually felt bad that a warranty thing couldn’t be covered there. (But not sorry to save big bucks.) Meanwhile, another customer had been telling me how she’s been going there for 37 years, and that she couldn’t imagine going anywhere else. No kidding. If your car needs literally anything done to it, run don’t walk, to Steve’s. It’s one of those places that’s just like America used to be. Although all they did was change my tire, they absolutely made my day, and kind of restored my faith in humanity a little bit. Yay, Steve’s! Thank you!
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