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TX Valve Block - Pad 1 Ton - TXX09008
OEX

TX Valve Block - Pad 1 Ton - TXX09008

Check fitment
$54
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09013
OEX

TX Valve Block - Pad 1.5 Ton - TXX09013

Check fitment
$82
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09015
OEX

TX Valve Block - Pad 1.5 Ton - TXX09015

Check fitment
$88
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09009
OEX

TX Valve Block - Pad 1.5 Ton - TXX09009

Check fitment
$81
Fitment Notes:
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TX Valve Block - Pad 2.5 Ton - TXX09043
OEX

TX Valve Block - Pad 2.5 Ton - TXX09043

Check fitment
$186
Fitment Notes:
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Eclipse Windscreen Wash 473ml

Don't let a dirty and bug smeared windscreen take your eyes off the road.

TX Valve Block - Pad 2 Ton - TXX09025
OEX

TX Valve Block - Pad 2 Ton - TXX09025

Check fitment
$111
Fitment Notes:
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TX Valve Block - Pad 2 Ton - TXX09037
OEX

TX Valve Block - Pad 2 Ton - TXX09037

Check fitment
$224
Fitment Notes:
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TX Valve Block - Pad 2 Ton - TXX09038
OEX

TX Valve Block - Pad 2 Ton - TXX09038

Check fitment
$137
Fitment Notes:
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TX Valve Block - Threaded 1.5 Ton - TXX09041
OEX

TX Valve Block - Threaded 1.5 Ton - TXX09041

Check fitment
$91
Fitment Notes:
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TX Valve Block - Pad 2 Ton - TXX09030
OEX

TX Valve Block - Pad 2 Ton - TXX09030

Check fitment
$104
Fitment Notes:
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TX Valve Block - Threaded 2 Ton - TXX09039
OEX

TX Valve Block - Threaded 2 Ton - TXX09039

Check fitment
$92
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09012
OEX

TX Valve Block - Pad 1.5 Ton - TXX09012

Check fitment
$54
Fitment Notes:
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TX Valve Block - Pad 1 Ton - TXX09003
OEX

TX Valve Block - Pad 1 Ton - TXX09003

Check fitment
$94
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09024
OEX

TX Valve Block - Pad 1.5 Ton - TXX09024

Check fitment
$200
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09023
OEX

TX Valve Block - Pad 1.5 Ton - TXX09023

Check fitment
$144
Fitment Notes:
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TX Valve Block - Pad 2 Ton - TXX09036
OEX

TX Valve Block - Pad 2 Ton - TXX09036

Check fitment
$114
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09022
OEX

TX Valve Block - Pad 1.5 Ton - TXX09022

Check fitment
$123
Fitment Notes:
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TX Valve Block - Pad 2 Ton - TXX09026
OEX

TX Valve Block - Pad 2 Ton - TXX09026

Check fitment
$101
Fitment Notes:
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TX Valve Block - Threaded 2 Ton - TXX09040
OEX

TX Valve Block - Threaded 2 Ton - TXX09040

Check fitment
$114
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09019
OEX

TX Valve Block - Pad 1.5 Ton - TXX09019

Check fitment
$127
Fitment Notes:
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TX Valve Block - Pad 1 Ton - TXX09004
OEX

TX Valve Block - Pad 1 Ton - TXX09004

Check fitment
$83
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09010
OEX

TX Valve Block - Pad 1.5 Ton - TXX09010

Check fitment
$67
Fitment Notes:
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TX Valve Block - Pad 1 Ton - TXX09001
OEX

TX Valve Block - Pad 1 Ton - TXX09001

Check fitment
$143
Fitment Notes:
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TX Valve Block - Pad 2 Ton - TXX09034
OEX

TX Valve Block - Pad 2 Ton - TXX09034

Check fitment
$128
Fitment Notes:
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TX Valve Block - Pad - TXX09017
OEX

TX Valve Block - Pad - TXX09017

Check fitment
$225
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09011
OEX

TX Valve Block - Pad 1.5 Ton - TXX09011

Check fitment
$105
Fitment Notes:
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TX Valve Block - Pad 1 Ton - TXX09007
OEX

TX Valve Block - Pad 1 Ton - TXX09007

Check fitment
$139
Fitment Notes:
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TX Valve Block - Pad 1.5 Ton - TXX09021
OEX

TX Valve Block - Pad 1.5 Ton - TXX09021

Check fitment
$124
Fitment Notes:
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Showing 1 - 39 of 61 products

Your comprehensive guide on car air conditioning TX valves, their function, maintenance, and troubleshooting.

Repco stock the widest range of Car Air Conditioning TX Valves

The TX valve is an essential component of your car's air conditioning system and plays a vital role in regulating refrigerant flow and maintaining consistent cooling performance. Repco stock hundreds of TX valves to suit thousands of vehicles.

Choosing to carry only the best TX valves from OEX, Denso, Reddot and more ensure you can keep your cars climate control system in perfect working order. Keep the heat at bay and cruise in comfort with the best in TX valves at Repco.

What is a TX Valve?

A TX valve, short for thermostatic expansion valve, is a critical component in a car's air conditioning system. It regulates the flow of refrigerant into the evaporator, ensuring the system operates efficiently and maintains the desired cabin temperature. By controlling the refrigerant flow, the TX valve helps prevent the evaporator from freezing or overheating, which could lead to system failure.

The TX valve works by sensing the temperature and pressure of the refrigerant as it enters the evaporator. Based on these readings, it adjusts the flow rate to match the cooling demand. This process ensures that the air conditioning system provides consistent performance, regardless of external conditions.

How Does a TX Valve Work?

The operation of a TX valve is based on a balance of forces. Inside the valve, there is a diaphragm that responds to three key factors: the pressure of the refrigerant entering the evaporator, the temperature of the refrigerant leaving the evaporator, and a spring that provides resistance. These forces work together to determine how much refrigerant is allowed to pass through the valve.

When the cabin temperature rises, the TX valve senses the increased demand for cooling. It opens wider to allow more refrigerant into the evaporator, where it absorbs heat from the air. Conversely, when the desired temperature is reached, the valve narrows to reduce the flow, maintaining a stable environment. This dynamic adjustment is what makes the TX valve an essential part of the air conditioning system.

Signs of a Faulty TX Valve

Like any mechanical component, TX valves can wear out or fail over time. Recognising the signs of a faulty TX valve can help prevent further damage to the air conditioning system. One common symptom is inconsistent cooling performance. If the air conditioning blows cold air intermittently or fails to cool the cabin effectively, the TX valve may not be regulating refrigerant flow properly.

Another sign of trouble is frost or ice forming on the evaporator or refrigerant lines. This could indicate that the TX valve is stuck open, allowing too much refrigerant to flow through. On the other hand, if the valve is stuck closed, the system may struggle to cool the cabin, and the compressor could overheat due to excessive pressure. In either case, prompt diagnosis and repair are essential to avoid further complications.

Common Causes of TX Valve Failure

Several factors can contribute to TX valve failure. One of the most common is contamination within the air conditioning system. Dirt, debris, or metal particles can clog the valve, preventing it from functioning correctly. Regular maintenance, including replacing the filter drier, can help minimise this risk.

Wear and tear are another common cause of failure. Over time, the internal components of the TX valve can degrade, leading to reduced performance or complete failure. Exposure to extreme temperatures and pressure fluctuations can accelerate this process. Additionally, improper installation or system overcharging can place undue stress on the valve, shortening its lifespan.

Diagnosing TX Valve Issues

Diagnosing a faulty TX valve requires a systematic approach. A qualified technician will typically start by checking the refrigerant pressure and temperature readings. Abnormal readings can indicate a problem with the valve or other components of the air conditioning system.

Visual inspection is another important step. Signs of frost, ice, or oil leakage around the valve can provide clues about its condition. In some cases, the technician may need to remove the valve for a closer examination. This process requires specialised tools and knowledge, so it is best left to professionals.

Replacing a TX Valve

If a TX valve is found to be faulty, replacement is often the best course of action. This process involves recovering the refrigerant from the system, removing the old valve, and installing a new one. It is important to use a valve that is compatible with the specific make and model of the vehicle, as well as the type of refrigerant used.

After the new valve is installed, the system must be evacuated and recharged with the correct amount of refrigerant. This ensures optimal performance and prevents damage to other components. Because of the complexity of this process, it is recommended to have it performed by a qualified technician.

Maintaining Your TX Valve

Proper maintenance is key to extending the lifespan of a TX valve and ensuring the overall health of the air conditioning system. Regular servicing, including checking refrigerant levels and replacing the filter drier, can help prevent contamination and other issues that can lead to valve failure.

It is also important to address any air conditioning problems promptly. Ignoring symptoms such as inconsistent cooling or unusual noises can lead to more serious issues, including damage to the TX valve. By staying proactive, vehicle owners can avoid costly repairs and enjoy reliable air conditioning performance.

Choosing the Right TX Valve

When replacing a TX valve, it is important to choose the right one for the vehicle. Factors to consider include the type of refrigerant used, the size and capacity of the air conditioning system, and the specific requirements of the vehicle manufacturer. Using an incorrect valve can lead to poor performance, reduced efficiency, or even damage to the system.

Consulting the vehicle's service manual or seeking advice from a qualified technician can help ensure the correct valve is selected.