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2018 RDX A/C Not Blowing Cold - Just Warm Air

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Chris P. · rep 0 · May 26, 3:32 AM · 1 replies · solved · Question

Vehicle: 2018 Acura RDX Technology

Hey everyone, I'm having a major problem with the air conditioning in my 2018 Acura RDX Technology package. It's starting to get hot here, and my A/C is only blowing warm air, even when set to the lowest temperature. I've tried turning it off and on, checking the fan speed, but nothing helps. The fan works, I can hear it, but the air coming out is just ambient temperature. There's no strange smell or loud noises, it just stopped cooling. Has anyone experienced this with their RDX, and what was the fix? I'm hoping it's not a huge repair bill.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:32 AM

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ClearTheCode admin answer:

An air conditioning system that only blows warm air in your 2018 Acura RDX Technology can be due to several common issues. While it's frustrating, many of these problems have straightforward solutions.

Common Causes:

  1. Low Refrigerant (Freon): This is the most common cause. A leak in the A/C system can lead to insufficient refrigerant, preventing the system from cooling effectively. This often means there's a leak somewhere in the lines, condenser, evaporator, or compressor.
  2. Faulty A/C Compressor: The compressor is the heart of the A/C system, pressurizing the refrigerant. If it fails (e.g., clutch doesn't engage, internal failure), it won't cool. You might hear a click when the A/C is turned on if the clutch is trying to engage.
  3. Blown Fuse or Electrical Issue: A fuse for the A/C compressor clutch or other components might be blown, preventing the system from engaging. Less commonly, wiring issues can occur.
  4. Malfunctioning Blower Motor or Resistor: While you mentioned the fan works, a failing blower motor or resistor can sometimes lead to inconsistent airflow or issues, though typically it would affect fan speed rather than temperature.
  5. Clogged Cabin Air Filter: A severely clogged cabin air filter can restrict airflow, but it typically doesn't stop cooling altogether; it just reduces the volume of air.
  6. Faulty Pressure Sensor: The A/C system has pressure sensors that tell the compressor when to engage. A faulty sensor (e.g., P0530 A/C Refrigerant Pressure Sensor Circuit Malfunction) can prevent the system from operating.

Diagnostic Steps:

  1. Check for Compressor Engagement: With the engine running and A/C on full cold, pop the hood and look at the A/C compressor pulley. You should see the inner hub spinning with the pulley (clutch engaged). If it's not engaging, check fuses related to the A/C system in your fuse box.
  2. Listen for Hissing Sounds: While the engine is off, listen for any faint hissing sounds near the A/C lines or components, which could indicate a refrigerant leak.
  3. Scan for OBD-II Codes: Although not always illuminated by a check engine light, HVAC systems can store specific codes (e.g., B1201 for A/C pressure sensor issues). An OBD-II scanner can help identify these.
  4. Inspect Cabin Air Filter: While unlikely to be the sole cause of no cold air, it's good practice to check and replace your cabin air filter if it's dirty.

When to See a Shop:

  • Immediately if you suspect a refrigerant leak, as refrigerant is a hazardous chemical and requires proper handling.
  • If the A/C compressor is not engaging, and you've checked relevant fuses.
  • If you've performed basic checks and the issue persists. An automotive A/C specialist or Acura dealership has specialized equipment to:
    • Accurately diagnose refrigerant levels.
    • Perform leak detection (dye test, sniffer).
    • Test compressor function and electrical circuits.
    • Replace faulty components like the compressor, condenser, or evaporator.
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