Mazda CX-70 & CX-90 3.3L A/C Compressor: Early Failures, Noises, and Replacement Costs (2024-2025)

A/C Compressor Failure Symptoms (2024-2025 CX-70 & CX-90)

Because the Mazda CX-70 and CX-90 are so new, long-term failure patterns have not yet emerged. However, owners on forums are already reporting some early A/C system issues. Here are the most common symptoms of a failing A/C compressor 🎬 Watch: 5 common signs of a failing A/C compressor on these vehicles.

• Warm Air from Vents: The most obvious sign of a problem is when the A/C system blows air that is not cold, or is even warm, when the temperature is set to its lowest setting. Some CX-90 owners have reported this issue occurring intermittently, sometimes resolving after restarting the vehicle.
• Loud Rattling or Grinding Noises: Several owners of new CX-90s have reported a loud rattling or clunking sound coming from the engine bay when the A/C is turned on. The noise disappears when the A/C is switched off. This often points to a problem with the compressor's internal components or its clutch mechanism.
• Compressor Clutch Not Engaging: The A/C compressor has a clutch on its pulley that engages to turn the compressor's internal pump. You should hear a distinct 'click' when you turn on the A/C, and see the center part of the pulley start spinning. If the clutch doesn't engage, the compressor isn't running. This can be caused by a bad clutch, low refrigerant, or an electrical issue.
• Visible Leaks: The A/C system is a closed loop. If you see oily residue on the compressor body or its connections, it could be a refrigerant leak. Refrigerant often has a special dye added to it to make leaks easier to spot with a UV light.

Known Issues, TSBs, and Recalls

While these vehicles are very new, some issues related to the A/C and other electronic systems have already been documented through owner complaints and official communications from Mazda.

Early A/C System Complaints

Owners on forums like Reddit have reported A/C issues on their new CX-90s, with some occurring just weeks or months after purchase. Common complaints include intermittent cooling where the system blows hot air until the car is turned off and on again, and loud rattling from the compressor area. 🎬 Listen: Real-world example of Mazda CX-90 compressor noise In at least one case, a dealership replaced the compressor, but the problem persisted, suggesting a more complex electrical or software issue. Another owner noted their dealer performed a software update for an A/C-related check engine light.

Technical Service Bulletins (TSBs)

As of early 2026, there are no widely published TSBs specifically addressing A/C compressor failure on the 3.3L Turbo models of the CX-70 or CX-90. However, Mazda has released TSB 07-001-24 for the CX-90 PHEV model related to the A/C compressor, indicating they are aware of A/C system issues on the platform. It is possible a similar TSB for the 3.3L models could be released in the future.

Related Recalls

There are no active recalls for the A/C compressor itself. However, Mazda has issued several software-related recalls for the 2024-2025 CX-90 and 2025 CX-70 that buyers should be aware of, as they can cause symptoms that might be confused with a component failure:

• NHTSA Campaign 24V815000 (Mazda Recall 7024J): This recall addresses improper software in the Powertrain Control Module (PCM) and Engine Control Module (ECM) that can cause malfunction lights and a loss of drive power. An owner experiencing A/C issues also reported an engine malfunction light.
• NHTSA Campaign 24V814000 (Mazda Recall 7124J): This recall is for software in the Dash Electrical Supply Unit (ESU) that can cause the defroster, seat belt warnings, and 360° view monitor to fail. A faulty defroster is directly related to the HVAC system.

Before replacing any hardware, it is critical to ensure the vehicle has had all open recalls and software updates performed by a Mazda dealer, as these may resolve A/C-related symptoms.

Buying a Used A/C Compressor

Given the high cost of a new OEM compressor, a low-mileage used unit can be a smart purchase, especially from a vehicle this new. Here’s what to look for:

• Verify the Part Number: The primary OEM part number for the 3.3L Turbo engine is KMW7-61-450. You may also see CA500MLEDA03, which has been seen on used parts from these models. Do not purchase a compressor intended for the PHEV model.
• Inspect the Pulley and Clutch: The pulley should spin freely and smoothly by hand with no grinding or wobble. The clutch plate in the center should be intact, not cracked or heavily rusted.
• Check the Ports: The inlet and outlet ports should be capped or sealed. An unsealed compressor can absorb moisture from the air, which will contaminate the A/C system and cause premature failure. If the ports are open, do not buy the part.
• Look for Leaks: Inspect the compressor body, especially around the seams where the case halves meet and where the electrical connector is. Any signs of oily grime suggest a potential leak.
• Consider Mileage: For a part this new, look for a compressor from a donor vehicle with the lowest possible mileage. A part from a vehicle with under 20,000 miles is ideal. Many recyclers provide the VIN and mileage of the donor vehicle.

Cost of Replacement

Replacing an A/C compressor is a significant expense. The system must be professionally evacuated of old refrigerant, the new parts installed, and then recharged with the precise amount of refrigerant and oil. Here is a cost breakdown:

Frequently Asked Questions