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TX Valve and AC Compressor in Your Vehicle’s Cooling System

The Crucial Role of the TX Valve and AC Compressor in Your Vehicle’s Cooling System

Your vehicle’s air conditioning system plays an integral role in maintaining comfort on the road. Two of its important components, the TX (Thermal Expansion) valve and the AC compressor, are critical for regulating the cooling process and ensuring that your car’s cabin stays at a comfortable temperature. Understanding how these components function, the common issues that can arise, and the maintenance steps required will help you keep your AC system in top condition and avoid costly repairs.

What is a TX Valve, and Why is it Important?

The TX valve, or thermal expansion valve, is responsible for controlling the amount of refrigerant entering the evaporator. By adjusting the flow based on the air temperature inside the cabin, the TX valve maintains a balanced cooling effect. When functioning correctly, the TX valve ensures efficient temperature regulation, reduced strain on the AC system, and extended compressor life.

Key Functions of the TX Valve

  • Regulates Refrigerant Flow: The TX valve ensures the right amount of refrigerant is delivered to the evaporator.
  • Maintains Consistent Temperature: By controlling the flow, the TX valve helps maintain a stable cabin temperature.
  • Improves Efficiency: A properly working TX valve helps the entire AC system function more efficiently.

The Role of the AC Compressor in Vehicle Cooling

The AC compressor is often referred to as the “heart” of the AC system. It pressurises and circulates refrigerant, allowing heat to be released and cool air to flow through the cabin. Without a properly functioning compressor, the AC system cannot produce cold air, making it essential to identify and address compressor issues early.

Key Functions of the AC Compressor in Car Conditioning

  • Circulates Refrigerant: The compressor pumps refrigerant through the system to produce cooling.
  • Pressurises Refrigerant: Compressing refrigerant gas enables the cooling process.
  • Ensures Cooling Consistency: A healthy compressor maintains a steady cooling effect inside the vehicle.

Common Signs of TX Valve and Compressor Failure

Both the TX valve and the AC compressor can experience wear over time, leading to diminished performance or even system failure. Recognising the signs early can help you avoid complete AC breakdowns and maintain comfort.

Symptoms of TX Valve Issues

  • Inconsistent Cooling: If the TX valve malfunctions, you may notice inconsistent cabin temperatures.
  • Frost on the AC Evaporator: A faulty TX valve may cause refrigerant to freese on the evaporator, affecting cooling performance.
  • Unusual Noises: Hissing sounds may indicate that the TX valve isn’t properly regulating refrigerant flow.

Symptoms of Compressor Failure

  • Warm Air: If the AC only blows warm air, it’s likely a compressor issue.
  • Loud Noises: Grinding or squealing noises can signify a failing compressor.
  • Oil Leaks: Leaks around the compressor may indicate internal damage.

How to Maintain Your Vehicle’s TX Valve and AC Compressor in car

Routine maintenance can extend the life of your vehicle’s TX valve and compressor, ensuring efficient cooling and preventing costly repairs.

Steps to Maintain the TX Valve

  1. Check Refrigerant Levels: Low refrigerant can lead to TX valve issues.
  2. Inspect for Frost Buildup: Frost around the valve indicates an imbalance that needs attention.
  3. Monitor Cooling Efficiency: If you notice changes in cooling performance, have the TX valve inspected.

Steps to Maintain the AC Compressor

  1. Run the AC Regularly: Running the AC periodically, even in winter, keeps the compressor lubricated.
  2. Check for Refrigerant Leaks: Low refrigerant stresses the compressor, so fix any leaks promptly.
  3. Schedule Regular Inspections: Have a professional inspect the AC system annually to catch any early signs of compressor wear.

Replacing the TX Valve and AC Compressor: When is it Necessary?

While regular maintenance can prolong the lifespan of the TX valve and compressor, these components may need replacement over time. Knowing when to replace them can save you from unexpected breakdowns and discomfort.

  • TX Valve Replacement: If you experience consistent cooling issues, frost buildup, or hissing sounds, it may be time to replace the TX valve. A professional inspection can confirm if replacement is necessary.
  • AC Compressor Replacement: When the compressor fails to blow cold air or emits unusual sounds, a replacement may be the best solution. Professional repair can be costly, but a new compressor can improve cooling efficiency significantly.

FAQs about the TX Valve and AC Compressor in Cars

1. How can I tell if my TX valve needs replacement?

If your AC is blowing warm air or you find frost on the evaporator, the TX valve may need replacing. A professional inspection will confirm this.

2. Can I drive with a failing AC compressor?

While technically possible, driving with a failing compressor can affect other AC components and may lead to costly repairs.

3. Is TX valve repair expensive?

Repair costs vary, but addressing issues early on can save money by avoiding full system breakdowns.

Expert Advice: Choosing Quality Parts for TX Valve and Compressor Replacement

When replacing the TX valve or compressor, quality parts ensure optimal performance and durability. Invest in trusted brands or OEM parts to get the best results. Consult a qualified technician for recommendations tailored to your vehicle’s make and model.

Ensure Maintaining a Healthy TX Valve and AC Compressor for Comfortable Drives

The TX valve and AC compressor are fundamental to your vehicle’s cooling system. By understanding their roles, recognising signs of failure, and following maintenance tips, you can ensure a comfortable, efficient ride in all seasons. Routine care and prompt attention to any issues will keep your AC running smoothly and prevent the need for costly repairs.

car air conditioning system

Learn about your Car’s Air Conditioning System

An important aspect of car care involves keeping the air conditioning well serviced. You want to make sure that your vehicle’s AC is always working at its optimal efficiency. Read on to get familiar with the five main components of a car’s air conditioning system:

Air conditioner compressor: This is the heart of your vehicle’s AC system. The air conditioner compressor pressurizes refrigerant so that the air is cooled, adjusts and controls temperatures inside and outside the vehicle, and transfers air into the condenser. For this whole process, AC compressor oil must be adequately be filled.

AC Condenser: The condenser is situated at the car radiator’s front and ensures that the temperature is kept low. It also functions to lower the pressure of any hot gases that the refrigerant might release. Along with the air conditioner compressor, the condenser also is an important part of the air-conditioning system. The main job of the condenser is to transport cool refrigerant liquid straight to the dryer/accumulator.

Dryer or Accumulator: Not all cars have an accumulator or dryer – it differs from each model to make of car. If your car’s AC system has a TX valve, it probably will have an accumulator too. The job of the dryer or the accumulator is to use a desiccant to separate liquid and gas so that only gas enters the air conditioner compressor. 

Thermal Expansion Valve: Cars with a thermal expansion (TX) valve will ideally have a dryer, and those with an orifice tube will have accumulators. The TX valve or the orifice tube is placed between the condenser and the evaporator to precisely monitor the pressure and temperature levels of the whole AC system and control the amount of refrigerant entering the evaporator.

Evaporator: Situated right behind the car’s dashboard, the evaporator’s function is to ensure cool refreshing air is released through the vents inside the car. The evaporator must cool the car’s insides with the refrigerant. 

While these are just the basics, it is a great place to start knowing your AC compressor oil and parts of your car’s air conditioning system. It will make it easier to understand your AC mechanic when you take your car for servicing or repairs.For best in class car ac repairs and maintenance, trust Cool Air Conditioning AC mechanics.

Car AC Compressor

AC Compressor Quick Buyer’s Guide

What is an air conditioning compressor?

The A/C compressor or “Pump” is the heart of your vehicles air conditioning system. It’s powered by a drive belt that’s connected to the crankshaft of the engine. The compressor pumps refrigerant vapour under high pressure, this liquid refrigerant moves to the evaporator. Here the liquid absorbs heat from the air inside the cabin, becoming a gas. This refrigerant gas goes through you’re A/C Condenser where it is cooled, returns to the compressor completing the cycle.

How does the A/C Compressor cool my car ?

Many people would be surprised to know that the air conditioning system does not actually create the cold air you feel when your air conditioning is turned on. The A/C system removes heat and humidity which lowers the cabins temperature.

How to choose the right air conditioning compressor?

Before you buy a replacement A/C Compressor , you need to know your vehicle’s make, model, and exact production date. If you don’t have it you can also check inside your car on the driver’s side door post, where it is usually written in month/year or date/month/year format.

You can also use the part number off your original A/C Compressor if you are not sure of your vehicle’s year or production date. This is infect the best method to guarantee you get the right replacement A/C Compressor for your vehicle. If you don’t have these part numbers, call your local vehicle manufacturer’s dealership, provide your vehicle identification number and ask their parts department for the OEM (original equipment manufacturer) part number of the air conditioning compressor. Often dealerships will not willing provide you this Part Number. However the trick is to ask for a emailed quotation. This way you will receive the Part Number to match your A/C Compressor.

If your car is not equipped with air conditioning, you can consult an automotive and air conditioning technician to install one.

What are the symptoms of a bad car AC compressor?

When you frequently turn your air conditioner on and off, the compressor, clutch, and other internal components are under great stress. After a while, this stress results in a faulty air conditioning compressor, which you can distinguish by some of the following symptoms.

  • You start to hear strange noises.
  • You no longer feel cold air.
  • You notice fluid leaks around the A/C Compressor or hoses.
  • The clutch that connects the compressor to the engine is jammed or seized.

How to install an air conditioning compressor in a car?

The installation of an air conditioning compressor is based on the following steps.

  • Have any remaining refrigerant recovered by a licensed automotive shop.
  • Remove the A/C Compressor and Flush the air conditioning system.
  • Replace any necessary components including all O-Rings the Receiver/Drier or Desiccant bag.
  • Evacuate the A/C System for a minimum 45 minutes.
  • Add the specified type and amount of A/C Compressor oil.
  • Have the A/C System re-gassed with the specified amount of refrigerant by an authorised person.
  • Run the A/C System and check performance.
AC Compressor

AC Compressor

You must use specific types of lubricants for automotive air conditioning. Both 1996 and newer air conditioning systems use R134a refrigerant and require a PAG (polyalkylene glycol) compressor oil. Your compressor will suffer or be damaged if you use the wrong type or viscosity of compressor oil. However, the main reason behind the failure of a newly installed air conditioning compressor is using the wrong type of compressor oil.

However, if the compressor manufacturer approves, you can use PAO (polyalphaolefin) oil in place of some PAG oils.

CAUTION: Never use PAG oil in hybrid vehicles because it is electrically conductive. Only POE (polyol ester) oil is allowed for hybrid cars because air conditioning compressors are electrically driven and are not conductive. If you use the wrong oil, you risk electrocution due to a short circuit in the air conditioning compressor.

You can only use mineral oil in older R-12 air conditioning compressors because R-12 does not mix with R-134 refrigerant.

“Universal” air conditioning compressor oils are usually PAO-based and do not have the same viscosity as the PAG oil recommended for a specific type of compressor. This may result in insufficient lubrication and premature compressor failure.

Newer vehicles with R-1234yf air conditioning systems need a special 1234yf compressor oil recommended by the vehicle manufacturer. General Motors suggests using only GM lubricants (PAG-PSD1 #19260643 for the 2013/14 Cadillac XTS and PAG-ND12 #19299051 for the 2013 Cadillac ATS). Do not use Universal compressor oils in R-1234yf applications.

PAG Oil Recommendations for Various Compressors

Below is a list of lubricants by the compressor manufacturer. Find the manufacturer of your compressor by looking for an identification tag or label on the unit (or refer to the reference illustrations to the right and left) 

Things to know about an A/C Compressor

Things to know about an A/C Compressor

Things to know about an A/C Compressor

Auto Air Conditioning System

The air conditioning system in your car performs the vital role of cooling the air temperature in the cabin of your vehicle. Your A/C System should be checked and serviced every two years. Regular servicing of your A/C system will ensure optimal performance and could potentially save repair costs further down the track.

A basic rundown of how the A/C Compressor works

Your car’s air conditioning compressor is driven by the engine using a belt. Its function is to transport the refrigerant into the system. The refrigerant is subsequently sucked in as a gas at low pressure and then compressed to raise the temperature. From there, it is transferred to the condenser in the form of air with increased heat and force. The liquid becomes very cold as it leaves the condenser and returns to its natural gaseous state.

Effects of a Malfunctioning compressor

Reduced efficiency in your cars A/C System is often caused by a leak in the system, particularly in the A/C hoses. This is one of the most common reasons for an underperforming system. Low levels of refrigerant are responsible for reduced efficiency of the air conditioning system. Poor airflow due to an underperforming fan, blockage or debris in the A/C Condenser can also reduce the efficiency of the cooling in your A/C System. It is important to check the condenser for obstructions or damage. Regular maintenance can help reduce the need for repairs in the future.

Other common causes of a malfunctioning A/C compressor include a faulty magnetic Clutch. This is an extremely common fault which will stop an A/C Compressor from working. A defective Compressor control valve is also another common fault in many A/C Compressors. This can usually be determined by gauge readings.

AC compressor

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Car's Air Conditioning Repaired by Professional Experts

Why You Should Hire Professional Experts for Repair of Your Car Air Conditioning

All equipment requires maintenance after a certain period of use. Your car AC is no different. It is one of the vital features of the car that ensures your journey in the car is as comfortable as ever. There is no point in keeping your car AC running if it starts giving problems. Minor issues can erupt into serious problems causing more damage to the vehicle and a greater outlay of funds for repair. 

At such times it is always best to get your car’s air conditioning repaired by professional experts.

What are the components that may need repair?

5 main components help to keep your car cool in hot summers and warm in chilly winters. They are: 

Why do you need to hire professional experts for repair?

Expertise and experience

Professional experts have the requisite expertise and experience to fix your issue promptly and efficiently. Diagnosis of the problem is accurate. They know exactly whether there is an issue with your car’s ac compressor oil or any other. 

Usage of top-quality car aircon parts

If there is a need to change any air conditioning auto parts, you are sure only the top quality car aircon parts will be used by professional experts. It gives you peace of mind knowing that your car is in good hands.

Customised service

The convenience of customised service cannot be denied, especially in times of specific needs. For example, you can sort out the issue of car aircon regas if you hire a professional repair service in Campbelltown. The experts ensure that all your needs are fulfilled to your satisfaction.

Quality service

The professional repair service has the latest equipment and tools to fix your issues. You are assured of top quality service from them, and this ensures that any issue regarding your ac condenser, ac compressor, tx valve, or any other part is sorted the first time around.

Satisfaction

Satisfaction is guaranteed if you hand your car to professional experts as they do not compromise on their services and ensure to resolve your problem to your satisfaction.

Before the advent of summer, ensure that your car AC is working in tip-top condition!  

Tips for Maintaining the Efficiency and Performance of Your Car’s AC System

Maintaining the efficiency and performance of your car’s AC system is important for staying comfortable on the road and extending the life of your car’s system. Here are some tips to help you get the most out of your car’s AC:

  1. Use the right refrigerant: Make sure you are using the right type of refrigerant for your car. Using the wrong refrigerant can damage your AC system and lead to costly repairs.
  2. Keep the system clean: A dirty or clogged air filter can reduce the efficiency of your AC system. Be sure to check and replace the air filter regularly.
  3. Maintain the right tire pressure: Properly inflated tires can improve the fuel efficiency of your car, which can also help your AC system run more efficiently.
  4. Use the AC sparingly: Using the AC excessively can put a strain on the system and reduce its efficiency. Try to use natural ventilation when possible and only turn on the AC when necessary.
  5. Have the system serviced regularly: Regular maintenance and servicing can help keep your AC system running smoothly and efficiently. This can include checking and replacing the drive belt, cleaning the evaporator and condenser coils, and checking the refrigerant level.
  6. Use a sunshade: Keeping the sun out of your car can help reduce the load on your AC system, making it more efficient. A sunshade can help block the sun’s rays and keep your car cooler.
  7. Avoid placing heavy items on top of the AC vents: Placing heavy items on top of the AC vents can block the flow of air and reduce the effectiveness of the system.

By following these tips, you can help ensure that your car’s air conditioner system is running efficiently and effectively. Regular maintenance and careful use of the system can also help extend its lifespan and save you money on repairs in the long run. Cool Car Air Conditioning in Australia is a fully licensed AC specialist with over 20 years of experience in car AC repair and maintenance. To keep your car in the best condition you can book their service online at www.coolcarairconditioning.com.au or contact them at 0403883061. 

Understanding the TX Valve and Thermal Expansion Valves

What is a TX or Thermal Expansion Valve?

A TX Valve is a metering device which controls the flow of liquid refrigerant into the evaporator coil.

How A TX Valve Works


TX valves have a small orifice which opens and closes with temperature changes at the coil outlet that are sensed by the capillary, which is always clamped to the coil outlet. Internally equalized valves have a small refrigerant charge which expands and contracts. This movement exerts pressure on a diaphragm to open or close the valve against the pressure in the evaporator coil itself. The pressure on the evaporator coil is exerted on the opposite side of the diaphragm by means of a bleed in the valve. Externally equalized valves are similar, except that a direct line to the evaporator coil allows evaporator outlet refrigerant pressure to the underside of the diaphragm, rather than by direct bleed-back as in the internally equalized valve. The block valve is inherently equalized, ensuring accurate flow without sensing bulbs or equalizer tubes. The fixed orifice tube is simply a set, or fixed, orifice which allows a metered amount of refrigerant through to the evaporator coil whenever the compressor is pumping. 


There Are Four Different Types of TX Valves


Internally Equalized, Externally Equalized, Block Type Valve and Fixed Orifice Tube.
Internally equalized valves are generally used for small to medium evaporator coils. On large Evaporator coils, externally equalized or block valves are used. Fixed orifice tubes are only used in vehicles fitted with accumulators.


TX Valve Issues, Symptoms and Causes.


When your TX Valve is stuck closed or blocked the refrigerant flow will be restricted, the low side pressure can drop into vacuum. This problem is indicated by low pressure readings and lack of cooling. Blockages can be caused by foreign particles or moisture freezing at the orifice.


Valve stuck closed or blocked
Little to no cooling and low pressure readings on gauges.

Valve stuck open
High pressure readings on both sides of the system with poor cooling performance.

Valve too small
Low pressure reading on low side and poor cooling.

Valve too big 
High reading on low side and poor cooling.

If the capillary is incorrectly positioned in the cold part of the evaporator coil will result in the valve tending to stay closed. A damaged capillary or a capillary bulb not clamped to the evaporator outlet will result in the valve tending to stay open.

car AC compressor

Is Your Car AC Compressor Causing a Power Drain? Here’s How to Check

When you turn on your car’s air conditioning, you expect it to cool the cabin and provide you with comfort during hot summer days. But what if you notice that your car’s performance seems sluggish or that the battery is draining faster than usual? This could be a sign that your car AC compressor is causing a power drain. In this blog, we will discuss the common causes of power drain caused by the AC compressor and how to check if your AC compressor is the culprit.


The car’s AC compressor is responsible for pressurizing the refrigerant and circulating it through the AC system. When the compressor fails, it can lead to poor AC performance or even a complete AC system failure. But did you know that a failing AC compressor can also cause a power drain?
There are several reasons why a car AC compressor can cause a power drain. One of the most common reasons is a failed clutch. The clutch is responsible for engaging and disengaging the compressor as needed. If the clutch fails, the compressor can stay engaged even when it’s not needed, causing a constant power drain.


Another reason for a power drain is a leak in the AC system. When the refrigerant leaks, the compressor has to work harder to pressurize and circulate the refrigerant, which leads to increased power consumption. Additionally, if the refrigerant level is low, the compressor may run continuously, causing a power drain.


So, how can you check if your car AC compressor is causing a power drain? The first thing to do is to observe your car’s behavior when the AC is turned on. If you notice that the car’s performance is sluggish, or the battery is draining faster than usual, turn off the AC and observe if the performance improves. If the performance improves, it’s likely that the AC compressor is causing a power drain.


You can also check the AC system’s pressure using a gauge. If the pressure is too low, it could be a sign of a refrigerant leak, which can cause a power drain. Additionally, you can check the compressor’s clutch by inspecting it for wear or damage. If the clutch is damaged, it may not be engaging and disengaging properly, causing a power drain.


If you suspect that your car’s AC compressor is causing a power drain, it’s best to take your car to a qualified mechanic for a proper diagnosis. The mechanic can inspect the AC system and determine the cause of the power drain. In some cases, a simple repair or a refrigerant recharge may be all that’s needed to restore the AC system’s performance and eliminate the power drain.


In conclusion, a failing car AC compressor can cause more than just poor AC performance. It can also cause a power drain that affects your car’s overall performance. If you notice that your car’s battery is draining faster than usual, or the performance seems sluggish, it’s important to check the AC system and have it inspected by a qualified mechanic. A little bit of preventive maintenance can go a long way in ensuring that your car’s AC system runs smoothly and efficiently.

Contact Cool Car Air Conditioning for a quote and friendly advice.
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