Replace Your Car's AC Thermal Expansion Valve or Orifice Tube
B & M Automotive & Diesel 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 B & M Automotive & Diesel 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.
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I was desperate to find a locally-owned quality repair shop I could TRUST to take care of my cars. After many disappointing experiences elsewhere, I went to B & M and WOW! Bob, the owner for 30 years, is thoughtful, considerate, thorough & a true master of his profession. Marty is quick to recognize a problem & communicate issues clearly in simple terms that are easy to understand. He also has a fun & witty sense of humor which certainly helps when you're stressed about car problems! They finish repairs ON TIME & CORRECTLY, and always return calls quickly. Bob insists on using only PROVEN QUALITY PARTS, & rates are always reasonable. What else could you possibly want from a repair shop?! I'm SO grateful to find this one!!!
Miki Hammat, 04/12/2021
My parents are in from NY and were having car trouble so I recommended B & M because they have fixed my car in the past. I find them to be honest and have reasonable prices. I say honest because I had a brake problem that another mechanic quoted me at $600 but at the time I couldn't afford so I brought my car to B & M for just an oil change. When I drove off I noticed the brakes felt like they were working properly again so I looked at the invoice from B & M and noticed they replaced a simple brake hose at no charge! The staff is very kind and welcoming and the owner Bob was there to greet us. They fixed my parents car and had them back on the road in no time. This place is a hidden gem. We will definitely be loyal customers for life now :)
Angel R. - Knoxville, TN
Great service and work at B &M auto. The owner is great and is all about service. Entire mechanic staff is very good and you will get the job you need done right. i take all my mechanic work there and never disappointed. They are honest and do very good work, try them you will be back! Thanks Bob and staff!
David T. - Knoxville, TN