How To Change Orifice Tube? Replacing the expansion valve new for 2022

It’s no secret that the orifice tube is often the cause of bad odor. While some people are born with a bad sense of smell, many people are able to correct it with surgery. However, the surgery is not always successful and often leaves people with a bad odor. If you are suffering from a bad odor and would like to correct it, you may want to consider changing your orifice tube.

This post will answer your question about “how to change orifice tube?” and provide relevant information.

how to change orifice tube
how to change orifice tube

Evacuating the system

Evacuating the system
Evacuating the system

Materials Needed

  • AC manifold gauge set
  • Refrigerant identifier
  • Refrigerant recovery system
  • Safety glasses
  • Workshop manual

Step to step

Step 1

The refrigerant identifier will take a small sample of the refrigerant in the system and tell you if it is recoverable or not.

This is important for two reasons:

  • Recovered refrigerant can cause extensive damage to equipment and spread the damage to other cars that are later hooked up to it.
  • In order to save money on refrigerant, some unscrupulous workshops have been using butane to fill air conditioning systems. This practice can lead to an explosion hazard.

The refrigerant identifier on your car will tell you what type of refrigerant is in your vehicle and whether it’s safe to use. Cars made in the 1980s may still use R12 refrigerant, while cars manufactured after 1990 use R135.

To recover the refrigerant, the appropriate equipment must be used. If you find out that the refrigerant is contaminated, it can only be removed from the system by using specialized equipment.

Step 2

To recover refrigerant from a car, you can connect the recovery system directly to the car, or connect it via the manifold gauges.

Open the valve on the storage tank, turn on the switch, and let the machine run until it sounds an alarm. This might take 20 minutes if the system is full. If you can’t get access to a recovery machine by borrowing or renting, have a mechanic come to your house and evacuate it for you.

Replacing the expansion valve

Replacing the expansion valve
Replacing the expansion valve

Materials Needed

  • Allen wrenches
  • New expansion valve
  • O-rings
  • Refrigerant oil
  • Safety glasses
  • Screwdrivers, both blade and phillips
  • Socket wrench set (1/4 drive)
  • Wrenches, open ended
  • Workshop manual

Step to step

Step 1

The expansion valve is usually located near the AC unit. You should buy your expansion valve and O-rings before you begin, as the AC system should not be open for longer than necessary. If you can’t complete the job all at once, disconnect any disconnected lines to keep atmospheric moisture from entering the system.

To determine whether your car uses an expansion valve, consult your workshop manual. If your car doesn’t have an expansion valve, it will use an Orifice tube.

If the expansion valve is not located under the hood, you may have to spend a few hours working in a very tight space to locate it.

If you are having trouble finding the expansion valve, follow the high pressure line from the receiver-dryer toward the firewall. It may disappear into a trim panel or a cowl panel which you will have to remove in order to access it.

Step 2

A refrigerant expansion valve is a device that regulates the flow of refrigerant in or out of a system. The valve typically has at least two lines going to it, and may have a fine capillary tube as well. Some models have four lines that are held on by fastening plates.

A capillary tube may be attached to one of the larger lines, or it may be inserted into the evaporator core. It should be possible to remove the tube from the evaporator through a hole in the evaporator case.

Step 3

Whenever an air conditioning line is disconnected, the O-rings should be replaced.

To use the O-rings, soak them in refrigerant oil before connecting the valve. This will make them ready for use when you need them.

Step 4

Reattach the lines to the expansion valve, install the fasteners, and push the capillary tube back into place. It should go straight back through the hole.

Replace an orifice tube

Replace an orifice tube
Replace an orifice tube

If your system uses an orifice tube instead of an expansion valve, most of the procedures are nearly the same. The difference is that the orifice tube is located inside the line going to the evaporator.

Materials Needed

  • Orifice tube
  • Orifice tube extractor tool
  • O-rings
  • Needle-nosed pliers
  • Refrigerant oil
  • Workshop manual
  • Wrenches, open ended

Step to step

Step 1

The orifice tube will be located inside the high-pressure line to the evaporator. It will most likely be located near a joint where the line steps up in size just before it enters the evaporator.

Step 2

If you break the connection while using your needle-nosed pliers to remove the line, there may be a plastic tab inside the line. If it doesn’t want to come out easily with just your hands, use the orifice tube extraction tool. The extraction tool can be inserted into the pipe and by turning it will engage tabs on the orifice tube that are present for removal.

The screen on the computer is damaged or clogged with debris, which may indicate damage elsewhere in the system.

The screen on the computer is damaged or has a clogged pixel, which indicates there may be damage elsewhere in the system.

Smear some refrigerant oil on the o rings and insert the new orifice tube into the line. Make sure to orient it in the correct direction, as it’s easy to put it in backwards. Next, replace the old O rings with new ones and re-connect the line.

Recharging the AC system

Recharging the AC system
Recharging the AC system

AC system recharging is a process best left to trained personnel. It requires specialized equipment, and the performance of the system can vary widely depending on weather it is done correctly.

Installing the correct amount of refrigerant and oil is critical which can only be done with proper equipment. Additionally, in some states you may need to be certified in order to purchase refrigerant.

To ensure optimum performance and avoid long-term problems with your car’s air conditioning, it is recommended that you have a professional recharge the system. If you would like to try this yourself, follow these instructions for recharging the car’s air conditioning system.

How To Change Orifice Tube?

How To Change Orifice Tube?
How To Change Orifice Tube?

Step 1: Become Familiar with AC Unit

Before attempting to fix an air conditioning problem on your car, it is important to become familiar with the various components and how they work. Reading through a current repair manual for your vehicle can help you see all of the different parts and understand how they work together.

Refrigerant handling is federally restricted to licensed handlers, so be aware that you will need to involve a licensed professional in this repair.

Step 2: Locate Orifice Tube

The orifice tube is located in a junction, in a tube that runs between the condenser and the evaporator.

Step 3: Disconnect Tube from Orifice Tube

To disconnect the liquid line from the junction box, use an open-ended wrench or a coupling wrench.

Step 4: Remove Seal from Line

There is a small, rubber seal located within the line near the end of the liquid line coupling. This must be removed before the orifice tube can be accessed. It can be done with a screwdriver or needle-nose pliers.

Step 5: Remove Orifice Tube

You will see the orifice tube within the line. Use some pliers, and gently pry it out of the line. You may need to twist in back and forth, in order to work it free. Make sure that you do this carefully so it does not break off within the tube

Step 6: Install New Orifice Tube

When replacing an old orifice tube on a liquid line, be sure to place the new tube in the same orientation as the old one and slide it into place. Make sure it is seated properly before tightening any screws.

READ:  When You Park A Vehicle With A Manual Transmission On A Hill?

Step 7: Install Seal

Before connecting the coupling to the line, you must place a new seal over the pin. Then, carefully press it into place and connect the coupling to the line with a wrench.

Step 8: Charge the System

Once the line has been repaired, you will need to charge the air conditioning system. This may require some expense to be included with the replacement.

Type of Oil Pressure Sensor Units

Type of Oil Pressure Sensor Units
Type of Oil Pressure Sensor Units

There are three types of oil pressure sending units.

  • Output Side
  • Screw-In
  • Electrical Voltage Output

All three instruments have a light that will turn on when the oil pressure is below a safe level.

When the engine is idling, the oil pressure light will come on and slowly turn off as RPM increases.

How Much Does One Oil Pressure Sending Unit Cost?

How Much Does One Oil Pressure Sending Unit Cost?
How Much Does One Oil Pressure Sending Unit Cost?

The price of an oil pressure sending unit can vary depending on the car and model, as well as what is being replaced. If you are unsure about the cost, contact your car’s manufacturer.

The oil pressure sending unit is a component that can be found at most auto parts stores or online parts stores. You can also purchase it from your car dealership. Depending on your budget and the urgency of the replacement, you may choose to shop at an auto parts store or online Parts Store.

If you need to replace an oil pressure sending unit on your vehicle, don’t wait too long to do so. The longer the delay, the greater the risk that your vehicle’s safety will be compromised.

Do not operate your car until you have fixed the oil problem since it can be dangerous to do so with low oil.

Signs of a Bad Oil Pressure Sensor

Signs of a Bad Oil Pressure Sensor
Signs of a Bad Oil Pressure Sensor

Check Engine Oil Light Remains On

When the warning light comes on, you should always check your engine oil. Even if you think your engine is full of oil, there may be a leak that needs to be fixed.

If your car’s engine oil is full but the light on the sending unit indicates that it needs to be replaced, there may be a false positive and the unit will need to be replaced.

Oil Pressure Reported as Extremely High or Low

If your car has an oil pressure gauge, you should look for signs of high or low oil pressure levels.

If the oil pressure gauge is reading low even after the car engine is warm, there may be a problem with the oil pressure sending unit.

If the oil pressure gauge is reading high levels soon after the car’s engine is started, it may be necessary to take action.

If your engine is idle, the oil pressure will likely be low. This means that your oil pressure sensor will have a low reading, which means that there is probably nothing wrong with it. However, it’s always best to make sure by checking the oil level and/or replacing the sensor if necessary.

Once you’ve parked your car, locate the oil dipstick and check its level. If it’s below or above the minimum or maximum levels on the dipstick, adjust it accordingly.

Oil Pressure Reporting Erratically

If your oil pressure gauge or engine oil warning light has erratic behavior—such as the gauge moving from low to high or high to low randomly or the light coming on and off frequently—you can be sure there’s a problem with the sending unit.

If your oil pressure sensor light keeps coming on even if you have just filled up your oil to the optimal level, it may be the problem. If the light is coming on and off while you are driving, it’s most likely a faulty sensor.

Whenever the warning light comes on again, check your oil level to ensure that it is still at the desired level. If it is not, then you know that it is time for an oil pressure sensor replacement and this will save you money in the long run.

Replacing a sensor rather than an engine can be a much more affordable solution, and one that you may need to take your car to a mechanic for if it is not done correctly.


If your oil pressure sensor light comes on, and you hear a strange ticking noise coming from the engine, it would be best to pull over as soon as possible.

The ticking sound is usually not indicative of a bad sensor; however, if you are running dangerously low on oil, your sensor might be warning you.

If you have recently filled up your oil, there is a possibility that there is a leak in the system, which could be causing the levels to drop. To check this, look under your car and see if any oil has been spilled or if there are any suspicious looking marks on the ground. If your car is still parked, look beneath it for signs of an oil leak.

READ:  When Stopping Your Car On A Slippery Surface?

If you notice a decrease in oil pressure, it’s important to check the oil level and see if there is a leak. If so, repair the leak as soon as possible to prevent damage to your engine.

What Causes an Oil Pressure Sending Unit to Go Bad?

What Causes an Oil Pressure Sending Unit to Go Bad?
What Causes an Oil Pressure Sending Unit to Go Bad?

Oil pressure sending units can fail because of loose or damaged connections in their wiring.

Troubleshooting the Oil Pressure Sending Unit

Troubleshooting the Oil Pressure Sending Unit
Troubleshooting the Oil Pressure Sending Unit


To troubleshoot the oil pressure sending unit, first disconnect the wire going to the unit and ground it with the key on. If the gauge rises to the highest point, everything is still good. You can also screw in the gauge and read oil pressure

Oil Pressure Sending Unit Replacement Steps

Oil Pressure Sending Unit Replacement Steps
Oil Pressure Sending Unit Replacement Steps

Oil pressure sending units typically light up when the oil pressure reaches a certain level. However, if there are issues with the unit, like low oil levels or broken parts, then the warning lights may not turn on even when the pressure is below the critical level.

When your car’s oil pressure falls below a certain level, it can cause serious problems with the engine. Replace the oil pressure sending unit as soon as possible to avoid any damage.

Step 1 – Locate the Oil Pressure Sending Unit

Before you work on your oil pressure sending unit in your car, make sure it is safe to do so. To do this, pop the hood of the car and prop the front of it with jack stands.

Locate the oil pressure sending unit on your car. It will be close to the oil filter, and most newer models have a round black half-inch long cylinder with two wire connectors. Older cars may have small round units that are 1½ inches wide.

Step 2 – Check the Oil Pressure Sending Unit

If your car’s oil pressure sending unit is not working, you may need to replace it.

Step 3 – Remove the Old Oil Pressure Sending Unit

To remove the old oil pressure sending unit, squeeze the connector and then pull it off.

Thread the new unit into place, being sure to use Teflon tape to ensure it doesn’t come loose.

Step 4 – Reinstall the Electrical Connector

After installing the new unit, connect the electrical connector to the unit. Turn on the power of your car and see if the oil gauge works. If it does not work, check for an electrical connection and make sure that it is installed properly.

To verify that the new oil pressure sending unit is properly connected to your car, close the hood of the vehicle and remove the car jacks.

F.A.Q about “how to change orifice tube”

How do you change an AC orifice tube?

Here are some steps to replace the orifice tube in your vehicle.
  1. Step 1: Become Familiar with AC Unit.
  2. Step 2: Locate Orifice Tube.
  3. Step 3: Disconnect Tube from Orifice Tube.
  4. Step 4: Remove Seal from Line.
  5. Step 5: Remove Orifice Tube.
  6. Step 6: Install New Orifice Tube.
  7. Step 7: Install Seal.
  8. Step 8: Charge the System.

How do I know if my orifice tube is bad?

A bad or failing expansion valve can cause a number of problems with your water system. These can range from low water pressure to leaks and even flooding. If you notice any of these symptoms, it’s important to get the valve replaced as soon as possible.

  1. The air conditioner is not working properly and is spewing warm air. An underperforming AC system is one of the first signs of a problem with the AC expansion valve or orifice tube.
  2. Frost on the AC evaporator or coming from the vents..
  3. AC compressor operating continually.

How do you remove an orifice tube?

Do you have to replace orifice tube?

If you experience warm air blowing from your car’s AC system, or if the AC doesn’t seem to be working correctly, it may be time to replace the expansion valve, or orifice tube.

How much does an orifice tube cost?

RepairPal estimates that the cost to replace an orifice tube on a car will range between $52 and $65 in labor costs, with parts costing between $13 and $15. This estimate does not include taxes or fees, so it may vary depending on your specific vehicle and location.


If you are looking to address a bad odor, changing your orifice tube may be the solution for you. We hope this article has provided you with the information you need to make a decision. If you have any questions, please do not hesitate to contact us. Thank you for reading.

Related Searches

  • when to replace orifice tube
  • orifice tube function
  • a/c orifice tube tool
  • orifice tube symptoms
  • orifice tube filter
  • how to remove orifice tube without tool
  • orifice tube repair kit
  • gmc acadia orifice tube location
See more articles in category: Tip & Guides