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Best Auto Repair, Knoxville

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

 91 Verified Review(s)

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.

More AC Repair Services:

Truck and Car AC Repair Services

Freon Recharging Services For Your Car Or Truck

AC Evaporator Services


what our customers say

Very friendly and great work. I will return when I need more automotive work.
L
, 04/30/2023

Thank you B&M Automotive! They are Honest, Experienced, and affordable! The first place that I took it to said that I needed another motor and boy were they wrong. I'm glad that I found B&M and they were quick to let me know that I did not need another motor. They knew exactly what it was and had it fixed in no time. I highly recommend them!
A
, 04/05/2023

They did a great job it was in and repaired very quickly I highly recommend them
E
, 03/22/2023

I have done business 3 times now with these fine folks. Work as always been exactly what we asked. Communication is always good. I highly recommend thier service for anything they offer. No personal relation. Honest review.
J
, 02/18/2023

Had an electrical problem with my F-150 (parasiticdrain). Battery would die every 2 days. They traced the problem and at a great price! They know what they are doing.
R
, 01/27/2023

Fast and honest service, really nice people.
C
, 11/08/2022

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