If your AC has been blowing warm air, cooling unevenly, or freezing up for no obvious reason, you might be dealing with one of the most misunderstood components in the entire HVAC system: the TXV, or thermostatic expansion valve.

But what does this little device do, and why does repairing it make such a big difference in your home’s comfort? Let’s break it down simply and helpfully.

What Does The TXV Actually Do?

Think of the TXV as the “traffic controller” of your refrigerant. It controls how much refrigerant flows into your evaporator coil, helping your system reach the perfect balance for cooling. Too much refrigerant and the coil floods.

Too little and your AC struggles to cool your home, especially during our California heat waves.

When the TXV isn’t working correctly, your AC simply can’t do its job as efficiently as it should.

Common Signs Your TXV Needs Attention

Not sure if your TXV is the culprit? Here are the most common red flags:

  • Frozen evaporator coils
  • Inconsistent or weak cooling
  • Short cycling
  • Hissing or unusual noises
  • High superheat readings

How Technicians Repair A Faulty TXV

Fixing a TXV is not a DIY project. It’s a delicate job that involves access to refrigerant, heat tools, and precise adjustments. Here’s what professional repair typically looks like.

1. Full TXV Replacement

This is the most common and reliable repair method, especially if the valve has completely failed.

A trained HVAC technician will:

  • Recover the refrigerant from your system.
  • Remove the faulty TXV using tubing cutters and nitrogen purging.
  • Brazed a new TXV into place in the correct orientation.
  • Recharge the system with the proper refrigerant level.
  • Test the system to confirm stable cooling.

Because brazing uses high heat and sensitive components are nearby, this job requires professional skill.

2. TXV Adjustment

Some TXVs can be adjusted instead of replaced.

A technician may:

  • Turn the spindle slightly clockwise to reduce refrigerant flow.
  • Turn it counterclockwise to increase refrigerant flow.
  • Make tiny adjustments, then run the system before making further changes.

This fine-tuning helps restore proper cooling, but only when the TXV is still functional.

Keep Your Cooling System Running Strong With Service Champions

If your AC is struggling or showing signs of TXV trouble, the fix might be easier than you think. Service Champions offers expert diagnostics, TXV repairs, and full system tune-ups to keep your home cool and comfortable all year long.

Our technicians know how local conditions affect your HVAC system, and we’re here to help your system run at its best.

Ready for cooler air and better performance? Contact Service Champions today for trusted, professional AC repair.