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2016 Model S HVAC Not Blowing Cold Air

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Mike T. · rep 0 · May 25, 3:59 AM · 1 replies · solved · Question

Vehicle: 2016 Tesla Model S 75D

My 2016 Tesla Model S 75D is having AC issues. For the past week, the air conditioning has stopped blowing cold air entirely. It just circulates ambient temperature air, no matter how low I set the temperature.

I've checked the cabin air filter, and it looks relatively clean. There are no strange noises coming from the vents or under the hood (frunk, rather). The fan speed works fine, and all other climate controls seem responsive.

Could this be a refrigerant issue, a compressor problem, or something else entirely? I haven't seen any specific error messages on the screen. Any ideas before I book a service appointment?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:59 AM

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ClearTheCode admin answer:

An HVAC system that only blows ambient air, despite fan operation, is a common complaint and points directly to the cooling cycle itself. For your 2016 Tesla Model S 75D, several components could be at fault.

  1. Initial Checks & Diagnostics:

    • Listen for Compressor: With the AC set to max cold, listen carefully in the frunk area (where the AC compressor is located) for the compressor engaging. You might hear a distinct hum or click.
    • Check for Leaks: While not always visible, a loss of refrigerant is the most common cause of no cold air. Look for oily residue around AC lines or components.
    • Review Tesla App/Screen: Sometimes, even without a direct fault code, the Tesla app or vehicle screen might show unusual power consumption or thermal management alerts.

  2. Potential Causes:

    • Low Refrigerant (R1234yf): This is the most frequent cause. A leak in the system allows refrigerant to escape, preventing proper heat exchange. The system will not engage the compressor if pressure is too low.
    • AC Compressor Failure: The compressor is the heart of the AC system. If it fails mechanically or electrically, it won't circulate refrigerant. This is a known issue on some older Tesla models.
    • HVAC Control Module: A fault in the electronic control unit that manages the HVAC system can prevent the compressor from engaging or direct airflow incorrectly.
    • Thermal Expansion Valve (TXV) or Orifice Tube: These components regulate refrigerant flow. A blockage or failure here can disrupt the cooling process.
    • Pressure Sensor Failure: If a pressure sensor in the AC system is faulty, it might incorrectly report low pressure, preventing the compressor from turning on.

  3. When to See a Shop: Since you're not getting any cold air and have done basic checks, it's time for professional diagnosis. An AC system requires specialized tools to properly evacuate, leak test, and recharge. You should:

    • Schedule Tesla Service: Contact Tesla service. They have the specific diagnostic tools to read any internal fault codes related to the HVAC system and can accurately identify the failed component.
    • Avoid DIY Refrigerant Kits: Tesla's AC systems are complex and use specific refrigerants. Generic recharge kits are not suitable and can cause further damage.
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