Working Hours
  • Mon 7:30AM - 5:30PM
    Tue 7:30AM - 5:30PM
  • Wed 7:30AM - 5:30PM
    Thu 7:30AM - 5:30PM
  • Fri 7:30AM - 5:30PM
    Sat Closed
  • Sun Closed
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847-298-4372 | 2100 E Touhy Ave, Des Plaines, 60018

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

Pat & Chuck's Auto Repair

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 Pat & Chuck's Auto Repair, 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 Are Saying

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We were in town to vend at a show in the Rosemont Convention Center when our transmission started to have problems. We asked around and ended up at Pat & Chuck's Auto Repair. The guys there are THE BEST! They managed to work on our car on short notice, replace the transmission and even replaced a couple of supports that we weren't aware needed replacing. (They kept the broken parts to show us.) They even checked over the rest of the car to make sure everything was in good running order and that we'd be able to make it home pulling our trailer without any further problems. We fully expected to pay a "Big City" price for the work that they did -- and we were pleasantly surprised when the bill was significantly less than we'd anticipated. There were no surprises, no add-ons and the final expense was just what they'd told us it would be. We'd go back there in a heartbeat and it's a shame that they're so far away from where we live! Chuck and Rod were friendly!

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I am always pleased with the work that I have had done at Pat & Chuck's, especially the most recent repair. I had been using another shop for convenience reasons, and had been told I needed my transmission rebuilt or replaced. Pat & Chuck"s could have just went ahead and did just that, but didn't; they diagnosed the correct issue, and fixed it, saving me approximately 1700 dollars.

  • ASE (Automotive Service Excellence)
  • IDENTIFIX
  • Jasper
  • ALL-DATA
  • Surecritic
  • Car Care Aware
  • Call Us For Service: 847-298-4372