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2016 Outlander Sport SEL AC Blowing Warm Air When Idling

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Mike T. · rep 0 · May 25, 4:13 AM · 1 replies · solved · Question

Vehicle: 2016 Mitsubishi Outlander Sport SEL

Hey everyone, I'm having an issue with the air conditioning in my 2016 Mitsubishi Outlander Sport SEL. The AC works fine when I'm driving at speed, blowing nice cold air. However, as soon as I come to a stop or am stuck in traffic, the air starts blowing warm. It's really frustrating in the summer heat!

Once I start moving again, the cold air returns. I've heard this could be related to the AC compressor, the condenser fan, or maybe even low refrigerant. I haven't noticed any strange noises from the engine bay or any leaks under the car.

Has anyone else experienced this specific problem with their Outlander Sport? What was the fix, and is this something I can troubleshoot myself before taking it to a shop? I'm trying to avoid a costly repair if it's something minor.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:13 AM

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ClearTheCode admin answer:

The symptom you're describing – AC blowing cold when driving but warm when idling – is a very classic indication of a specific type of AC system problem. It's often related to airflow over the condenser or refrigerant pressure.

Possible Causes:

  1. Faulty Condenser Fan: When driving, airflow over the condenser (located in front of the radiator) helps dissipate heat from the refrigerant. When idling, the condenser fan needs to pull air through to achieve the same cooling. If this fan isn't working correctly (e.g., seized motor, bad relay, broken blades), the refrigerant won't cool sufficiently, leading to warm air.
  2. Low Refrigerant (Freon): While less likely to cause only an idle issue, significantly low refrigerant can reduce system efficiency, making it struggle more at idle when less airflow is available.
  3. Clogged Condenser: Debris (leaves, bugs, dirt) can accumulate on the condenser fins, restricting airflow and reducing its ability to cool the refrigerant, especially at low speeds.
  4. Compressor Issues: A weak compressor might struggle to maintain adequate pressure at lower engine RPMs, though this often presents with other symptoms too.
  5. Pressure Switch Malfunction: A faulty pressure switch might not be signaling the fan to turn on or the compressor to engage correctly under specific pressure conditions.

When to See a Shop: While you can visually inspect the condenser fan for obvious damage or if it's spinning when the AC is on and the engine is idling, diagnosing refrigerant levels and other electrical components requires specialized tools. It's best to take your vehicle to an automotive AC specialist or your Mitsubishi dealership.

Recommended Steps:

  1. Visual Inspection of Condenser Fan: With the engine running and AC on high, check if the condenser fan (usually in front of the radiator) is spinning. If it's not, check the fan's fuse and relay.
  2. AC System Performance Check: A technician will connect gauges to your AC system to measure high and low-side pressures. This will immediately indicate if refrigerant levels are low or if there's an issue with the compressor or expansion valve.
  3. Leak Detection: If refrigerant is low, they will perform a leak test to find the source of the leak, as simply recharging without fixing the leak is a temporary solution.
  4. Condenser Inspection: They will inspect the condenser for blockages and ensure it's clean.
  5. Electrical Diagnostics: If the fan isn't working, they will diagnose the electrical circuit, including the fan motor, relay, and wiring.

The most common culprit for this specific symptom is often the condenser fan or its control circuit. Getting it checked will restore your comfort and prevent potential damage to other AC components.

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