Clock icon

Best Auto Repair, Knoxville

Clock icon

NOW HIRING - AUTOMOTIVE TECHNICIANS

All Experience Levels Welcome. Offering Competitive Pay, Great Benefits, and Training!

APPLY TODAY Arrow Icon
 80 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

Great
D
, 05/22/2022

Great service done in a timely manner. Thanks.
h
, 04/26/2022

Highly recommend B&M. They made every effort to fix my Immobilize and ECU. When no one else could or wouldn't take the time to try to fix it. Had issues with the fuel pump and they kept at it until all issues were resolved. Very polite and professional. This place is awesome.
K
, 04/04/2022

Great experience here. Got the job done in one day and I'm back on the road.
C
, 03/02/2022

Always friendly, timely, and reasonable. Definitely recommend.
D
, 03/01/2022

It's hard to find someone to work on Italian cars, and even harder to find someone to do it at a reasonable price, these guys did both! My Little Fiat turbo, runs like a champ! Thx guys!
M
, 02/08/2022

  • Bumper To Bumper
  • Jasper
  • ASE Master Technician
  • ALL-DATA
  • Amsoil
  • ASE (Automotive Service Excellence)
  • Springleaf Financial
  • Sinister Diesel
  • Thoroughbred Diesel
  • Advance Diesel
  • Synchrony
  • Car Care Aware
TAP TO CALL NOW 865-922-7111 X