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Best Auto Repair, Riverside
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 196 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 Protrans Automotive & Transmission Specialists, 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

We've been going to Pro Trans for over 20 years & always have good experiences. I want to thank Michael for his personal service all these years. They've replaced engines & transmissions in two of our vehicles. There is no job too small or too big, so far. They don't even mind working on our raised truck with a 6 inch lift! Thanks again for your the great work!
J
, 01/15/2022

I was nervous about finding a shop to work on my truck since there are so many shady mechanics out there, but Protrans ended up doing an amazing job. They were great about communicating with me throughout the whole process as well. I believe I paid a fair price for the repair and they didn't try to sell me a bunch of service that I don't need. I will certainly be using them in the future if I need to.
R
, 01/14/2022

The crew at Protrans replaced my fuel tank after thrives drilled a hole in my existing tank and had my truck back to me in a day and a half. Thanks again!
G
, 01/13/2022

Courteous, professional and friendly staff at ProTrans. Transparent pricing and estimates. Super quick one day turnaround on the work done. Will return for future service and repairs. Thanks!!
J
, 12/23/2021

The team at Protrans are professional and service minded. They performed a synthetic oil change on my sister's Chevy Cruze swiftly and seamlessly. It was my first time using this company and I will definitely be going back. A shout out of thanks to Jeff, Manny, Haley and the the entire Protrans team!
L
, 12/21/2021

Prompt friendly service. They let me make an appointment. Explained services well.
R
, 12/17/2021

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