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2021 MDX Advance A/C Blowing Warm Air & Strange Noise

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Mike T. · rep 0 · May 26, 3:55 AM · 1 replies · solved · Question

Vehicle: 2021 Acura MDX Advance

My 2021 Acura MDX Advance is having A/C problems, and it's starting to get hot here! The air conditioning is blowing warm air, or at best, only slightly cool air, even when set to the lowest temperature. On top of that, I've started hearing a strange, almost hissing or rattling noise coming from under the hood when the A/C is running.

It worked perfectly fine last summer, so this is a new development. I'm hoping it's something simple and not a major repair. Has anyone experienced similar symptoms with their newer MDX? What should I check first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:55 AM

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ClearTheCode admin answer:

  1. Refrigerant Level: The most common reason for warm A/C is low refrigerant. A leak in the system can cause the pressure to drop, leading to inefficient cooling. The hissing sound could indicate a small leak.
  2. Condenser/Compressor Check: Inspect the A/C condenser (located in front of the radiator) for any obstructions like leaves or debris, or signs of damage. The rattling noise could potentially be related to the A/C compressor clutch or the compressor itself failing.
  3. Cabin Air Filter: While less likely to cause warm air, a severely clogged cabin air filter can restrict airflow and reduce overall A/C performance. It's a good, inexpensive item to check and replace if dirty.
  4. Causes:
    • Low refrigerant due to a leak (common).
    • Faulty A/C compressor or clutch.
    • Clogged or damaged condenser.
    • Malfunctioning blend door actuator (less common for total warm air).
    • Electrical issues with the A/C system.
  5. When to See a Shop: If the air is consistently warm and you hear unusual noises, it's best to take your MDX to a professional. A qualified technician can perform a proper diagnostic test, including checking refrigerant pressure, inspecting for leaks using dye, and evaluating the compressor and other components. An OBD-II scan might reveal codes related to climate control system sensors, though A/C issues don't always trigger a check engine light. Addressing it promptly can prevent further damage to the compressor.
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