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2017 Lancer A/C Blowing Warm Air - What's Wrong?

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Chris P. · rep 0 · May 22, 5:37 AM · 1 replies · solved · Question

Vehicle: 2017 Mitsubishi Lancer ES

Hey everyone,

I've got a 2017 Mitsubishi Lancer ES, and with summer just around the corner, my A/C has decided to stop working properly. It's blowing warm air, even when I have it set to the coldest setting and the fan on high. It was working fine last year, but now it's just not cooling at all.

I've checked the cabin air filter, and it looks pretty clean. I'm not hearing any strange noises from the engine bay when I turn the A/C on, but it's definitely not getting cold. I'm hoping it's something simple like needing a recharge, but I'm not sure how to check or what else it could be.

Has anyone with a 2017 Lancer or similar Mitsubishi experienced this? What are the common culprits for A/C failure, and is there anything I can troubleshoot myself before taking it to a shop? Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:37 AM

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A/C systems can be complex, but blowing warm air is a clear sign something isn't right. Here are the most common reasons for your 2017 Lancer's A/C issue:

  1. Low Refrigerant (Freon): This is the most frequent cause. A low refrigerant level, usually due to a small leak somewhere in the system (hoses, O-rings, condenser, evaporator), means the system can't effectively transfer heat. While you can buy DIY recharge kits, they only mask a leak and don't fix the underlying problem. A professional will evacuate the system, check for leaks, and then recharge it to the precise level.
  2. Compressor Failure: The A/C compressor is the heart of the system, pressurizing the refrigerant. If it fails (e.g., clutch doesn't engage, internal failure), the system won't cool. You might hear a click when you turn on the A/C as the clutch tries to engage; if you don't hear it, the compressor or its electrical circuit might be at fault.
  3. Condenser Blockage/Damage: The condenser, located in front of your radiator, dissipates heat. If it's blocked by debris or damaged (e.g., from road impact), it can't cool the refrigerant effectively.
  4. Electrical Issues: A blown fuse, faulty relay, or wiring problem can prevent the compressor from engaging or other A/C components from functioning.
  5. Blend Door Actuator: Less common, but if the blend door actuator (which controls whether hot or cold air enters the cabin) is stuck on 'hot,' it will blow warm air regardless of the A/C system's function.

When to See a Shop: While you can check fuses related to the A/C system, diagnosing and repairing A/C issues often requires specialized tools (e.g., manifold gauges, leak detectors, vacuum pump). It's best to take your Lancer to a qualified automotive A/C technician. They can accurately diagnose the problem, safely handle refrigerants, and perform the necessary repairs to get your A/C blowing cold again.

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