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AC Only Blows Warm Air in My 2021 RDX A-Spec

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Mike T. · rep 0 · May 26, 3:56 AM · 1 replies · solved · Question

Vehicle: 2021 Acura RDX A-Spec

My 2021 Acura RDX A-Spec's air conditioning system suddenly stopped blowing cold air. It was working perfectly fine last week, but now no matter how low I set the temperature, it just blows ambient or slightly cool air, never truly cold.

The fan works fine, and I can hear the compressor engage sometimes, but the air coming out of the vents is definitely not cold enough to cool the cabin, especially with summer approaching. I've checked the cabin air filter, and it looks pretty clean.

Is this a common issue for newer RDX models? What should I be looking for? Could it be a simple fix or something more serious like a refrigerant leak or compressor failure?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:56 AM

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ClearTheCode admin answer:

An AC system suddenly blowing warm air in a relatively new vehicle like your 2021 Acura RDX A-Spec usually points to a few specific issues. Here's what to consider:

  1. Refrigerant Level (Leak): The most common reason for an AC system to stop blowing cold air is low refrigerant. This almost always indicates a leak somewhere in the system (e.g., condenser, evaporator, hoses, or seals). A professional can check the system's pressure and, if low, add a UV dye to help locate the leak.
  2. AC Compressor Failure/Clutch Issue: The compressor is the heart of the AC system. If it's not engaging properly, or if its clutch is failing, it won't be able to circulate refrigerant and cool the air. You mentioned hearing it engage sometimes, which could indicate an intermittent clutch issue or a failing compressor.
  3. Clogged Condenser: The condenser (located in front of the radiator) is responsible for dissipating heat. If it's blocked by debris (leaves, bugs, road grime) or damaged, it can't cool the refrigerant effectively.
  4. Blend Door Actuator: Less common, but a malfunctioning blend door actuator can prevent the system from directing cold air into the cabin, even if the AC system itself is working correctly. This would typically result in air blowing at the ambient temperature, regardless of the AC setting.

Causes: Low refrigerant due to a leak, a faulty AC compressor or compressor clutch, a clogged or damaged condenser, or a malfunctioning blend door actuator.

When to see a shop: AC systems are complex and require specialized tools for accurate diagnosis and repair, especially when dealing with refrigerants. Do not attempt to "top off" refrigerant yourself without addressing a potential leak, as this can overpressure the system and cause further damage. A professional technician can accurately diagnose leaks, test all components (compressor, pressure switches, sensors), safely recover and recharge the system, and perform any necessary repairs. Early diagnosis can prevent more expensive component failures.

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