AC Compressor

When your vehicle's air conditioning compressor fails, one of the first questions you may have is:

Should you replace it with an OEM compressor or choose a quality AC compressor?

There is no single answer that is right for every vehicle.

The best choice depends on factors such as the vehicle's age, warranty status, budget, parts availability, correct fitment and the quality of the replacement compressor.

For many vehicles outside their original factory warranty, a quality aftermarket AC compressor can offer a practical balance between performance, reliability, availability and cost.

In this guide, we'll explain the key differences between OEM and aftermarket AC compressors and what to check before choosing a replacement.

What Is an OEM AC Compressor?

OEM stands for Original Equipment Manufacturer.

In everyday automotive parts terminology, an OEM or genuine replacement compressor refers to a compressor supplied through the vehicle manufacturer's original equipment or genuine parts channel and intended for the original vehicle application.

One of the main advantages of choosing an OEM or genuine compressor is confidence in the original vehicle specification and fitment.

Advantages of OEM AC Compressors

Original vehicle application

OEM or genuine compressors are intended for specific vehicle applications and are matched to the manufacturer's specifications.

Fitment confidence

For customers who want the same type of replacement specified through the vehicle manufacturer's parts network, an OEM or genuine compressor can provide a straightforward option.

Manufacturer support

Depending on the vehicle and supplier, genuine parts may be supported through the vehicle manufacturer's dealer and parts network.

Potential Disadvantages of OEM Compressors

Higher purchase price

Genuine OEM replacement parts are often more expensive than aftermarket alternatives.

Availability

Depending on the vehicle and part number, sourcing a genuine compressor may take longer or require purchasing through a particular dealer or supplier.

For an older vehicle that is outside its original factory warranty, the additional cost of a genuine compressor may not always be necessary.

What Is an Aftermarket AC Compressor?

Not all aftermarket AC compressors are the same.

The aftermarket includes products at different quality and price levels.

Premium OE-Equivalent AC Compressors

Premium aftermarket compressors are designed for specific applications and may be manufactured to OE-equivalent specifications.

Depending on the manufacturer, these compressors may use equivalent dimensions, mounting points and operating characteristics for the intended application.

For workshops and vehicle owners looking for a balance between cost and quality, a reputable premium aftermarket compressor can be a practical alternative to a genuine replacement.

Economy Replacement Compressors

Economy compressors are generally positioned at a lower price point.

Product quality, materials, manufacturing standards and long-term durability can vary between manufacturers and suppliers.

A lower purchase price should therefore not automatically be treated as better overall value.

Rebuilt or Remanufactured Compressors

Remanufactured compressors are previously used units that have been rebuilt using replacement components.

Their quality and reliability can depend heavily on the rebuilding process, components used and supplier.

When comparing replacement options, it is important to understand exactly what type of compressor you are purchasing.

OEM vs Premium Aftermarket AC Compressors

The most useful comparison is not simply:

OEM vs cheap aftermarket.

A better comparison is:

OEM vs a quality aftermarket AC compressor from a reputable manufacturer or supplier.

The key takeaway is simple:

Choosing an aftermarket compressor does not mean choosing a low-quality compressor.

The manufacturer, specifications, fitment and supplier support all matter.

Why Quality Aftermarket Compressors Can Be a Practical Choice in Australia

For many Australian vehicle owners and independent workshops, choosing replacement parts involves more than simply comparing the purchase price.

Other factors can include:

• Parts availability
• Vehicle downtime
• Repair cost
• Vehicle age
• Correct fitment
• Warranty support
• Long-term reliability

Cost and Value

For an older vehicle outside its original factory warranty, the owner may not necessarily want to spend the same amount on a genuine compressor as they would on a newer vehicle.

A quality aftermarket AC compressor can provide another option when the customer wants to balance repair cost with product quality.

The important distinction is between quality aftermarket parts and simply choosing the cheapest available replacement.

Parts Availability and Vehicle Downtime

Vehicle downtime can be an important consideration for workshops, tradespeople, delivery vehicles and other businesses that rely on their vehicles every day.

When a suitable replacement compressor is available locally, a workshop may be able to complete the repair without waiting for a specific genuine part to become available.

Availability can therefore be an important part of the overall repair decision.

Vehicle Age and Warranty Status

The age and warranty status of the vehicle can also influence the decision.

For a newer vehicle still covered by a manufacturer's warranty, genuine parts may be preferred depending on the repair and warranty requirements.

For an older vehicle outside its factory warranty, a quality aftermarket compressor may be a more practical option.

If you're unsure about warranty requirements, check the vehicle manufacturer's warranty terms or speak with the relevant dealer before choosing a replacement part. For more information, see our guide: Does an Aftermarket AC Compressor Void Your Car Warranty in Australia?

How to Choose the Right Replacement AC Compressor

Choosing the right compressor is more important than simply choosing the cheapest compressor.

A compressor that looks similar to the original may not necessarily be the correct replacement.

Before ordering, check as much of the following information as possible.

1. Vehicle Make, Model and Year

Start with the basic vehicle information:

• Make
• Model
• Year
• Engine
• Variant

The same model may use different compressors depending on the engine, production year or vehicle specification.

2. Original OEM Part Number

The original compressor part number is one of the most useful references when checking replacement compatibility.

Where possible, compare the original OEM part number with the aftermarket compressor's listed cross-reference numbers.

If you have the original compressor available, checking the part number before ordering can help reduce the risk of selecting the wrong application.

3. Compressor Specifications

Other specifications may also need to be checked, including:

• Compressor model
• Mounting configuration
• Mounting points
• Pulley
• Clutch
• Number of grooves
• Electrical connector

A compressor can look very similar to another unit while still having different mounting or electrical specifications.

If two compressor listings still appear suitable, see our guide to comparing two AC compressors before ordering.

4. Refrigerant Compatibility

Make sure the replacement compressor is compatible with the refrigerant specified for the vehicle's air conditioning system.

The refrigerant and compressor specifications should be confirmed for the specific application rather than assumed from the vehicle's age or model alone.

5. Refrigerant Oil and Oil Specification

The compressor must also be compatible with the correct refrigerant oil and oil specification for the application.

Using the wrong oil or incorrect oil quantity can affect compressor performance and service life.

Correct system preparation and installation are therefore important when replacing an AC compressor. For more information about why a replacement compressor can fail after installation, read our guide: Why Does a New AC Compressor Fail? Common Causes After Compressor Replacement.

6. Warranty and Supplier Support

Before purchasing, check what warranty is offered with the compressor and whether there are any installation or warranty requirements.

It is also a good idea to keep:

• Purchase invoices
• Installation records
• Part numbers
• Vehicle information

Good documentation can make it easier to deal with any future warranty or fitment questions.

OEM vs Aftermarket AC Compressor: Which One Is Right for You?

There isn't one compressor choice that is best for every vehicle.

The right option depends on the vehicle, repair requirements, warranty situation and customer's priorities.

When Is an OEM Compressor the Better Choice?

A genuine OEM compressor may be the preferred option when:

• The vehicle is still under a manufacturer's warranty.
• The repair is being carried out under a manufacturer warranty program.
• The customer specifically wants genuine manufacturer parts.
• The vehicle has a specialised application where the original specification is particularly important.
• The customer is willing to pay more for a genuine replacement.

In these situations, the additional cost of a genuine compressor may be justified.

When Is a Premium Aftermarket Compressor a Good Option?

A premium aftermarket AC compressor may be worth considering when:

• The vehicle is outside its factory warranty.
• A genuine compressor is significantly more expensive.
• A suitable replacement is readily available.
• The workshop needs to minimise vehicle downtime.
• The correct application and fitment can be verified.
• The customer wants to balance repair cost and product quality.

The goal should not be to find the cheapest compressor.

The goal should be to find a quality compressor that is correctly matched to the vehicle and supplied by a reputable manufacturer or supplier.

Frequently Asked Questions

Is an aftermarket AC compressor as good as an OEM compressor?

A quality aftermarket AC compressor can provide OE-equivalent performance when it is correctly designed for the application and manufactured to appropriate quality standards.

However, quality varies between aftermarket manufacturers, so it is important to consider the manufacturer, specifications, warranty and supplier support.

Are all aftermarket AC compressors the same?

No.

Aftermarket compressors are available at different quality levels, including premium OE-equivalent, economy and remanufactured options.

The manufacturer, product specifications and supplier are important factors when comparing compressors.

Is an aftermarket AC compressor cheaper than OEM?

Aftermarket compressors are generally more affordable than genuine OEM replacement parts, although the price difference depends on the vehicle, compressor and supplier.

The cheapest option is not necessarily the best overall value.

How do I know if an aftermarket compressor will fit my vehicle?

Start with the vehicle's:

• Make
• Model
• Year
• Engine
• OEM compressor part number, if available

You may also need to check the compressor's mounting points, pulley, clutch, electrical connector and other specifications.

If you are unsure, contact the supplier before ordering.

Should I choose OEM or aftermarket for an older vehicle?

For an older vehicle outside its factory warranty, a quality aftermarket compressor can be a practical replacement option.

However, the best choice depends on the vehicle, compressor application, repair requirements and customer preferences.

Does the cheapest AC compressor offer the best value?

Not necessarily.

The initial purchase price is only one part of the total repair cost.

Product quality, correct fitment, warranty support, availability and the potential risk of premature failure should also be considered.

Does compressor installation affect its lifespan?

Yes.

Correct diagnosis, system preparation, oil specification, refrigerant charge and installation procedures can all affect compressor performance and service life.

Replacing a failed compressor without identifying the underlying cause of failure can also increase the risk of another component or replacement compressor failing.