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2017 Model S 75D AC Not Cooling - Just Blowing Warm Air

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

Vehicle: 2017 Tesla Model S 75D

Hi everyone,

I'm having an issue with my 2017 Tesla Model S 75D's air conditioning. For the past few days, it's just been blowing warm air, even when set to the lowest temperature. The fan works fine, and I can hear the compressor kick on initially, but it never gets cold. This is really frustrating, especially with the summer heat starting.

I've tried turning the AC off and on, rebooting the main screen, and even a full power cycle of the car, but nothing seems to help. There are no specific error messages on the screen, just no cold air. The cabin overheat protection also doesn't seem to be cooling the car effectively anymore.

Has anyone else experienced this with their Model S? Is there a common fault like a refrigerant leak, or could it be something more serious like the AC compressor itself? Any diagnostic steps I can take or things to look for before taking it into service?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It's a common and frustrating problem when your AC stops blowing cold air, especially in a Tesla where the climate control is integrated with battery thermal management. For your 2017 Model S 75D, there are several potential causes for this issue.

  1. Listen for Compressor Noise: While you mentioned hearing it initially, listen carefully for consistent operation. A failing compressor might cycle irregularly or make unusual noises. If it's not running at all, that's a key indicator.
  2. Check for Leaks: While difficult without specialized tools, sometimes visible signs of refrigerant leaks (oily residue) can be found around AC lines or components under the frunk. A significant leak would result in low refrigerant pressure.
  3. Review Service History: Has the AC ever been serviced or recharged? Over time, small amounts of refrigerant can escape, leading to reduced cooling performance.
  4. Software Issues: Although less common for a complete AC failure, ensure your car's software is up to date. Sometimes, climate control logic can be improved or bugs resolved with updates.

Common Causes for AC Not Cooling in a Tesla:

  • Refrigerant Leak: This is the most common cause. Teslas, like all vehicles, can develop leaks in AC lines, condensers, evaporators, or seals. Low refrigerant pressure prevents the system from cooling effectively.
  • AC Compressor Failure: The electric AC compressor can fail. This is a more expensive repair. Symptoms include no cold air, unusual noises, or the compressor not engaging at all.
  • Condenser Blockage/Damage: The condenser, usually located at the front of the car, can get clogged with debris or damaged by road hazards, impeding heat dissipation.
  • Thermal Expansion Valve (TXV) Issues: A faulty TXV can restrict refrigerant flow, preventing proper cooling.
  • HVAC Control Module Failure: Less common, but a fault in the module controlling the AC system could prevent it from operating correctly.
  • 12V Battery Issues: While not directly causing AC failure, a weak 12V battery can sometimes cause various electrical systems to malfunction, including climate control, if it interferes with sensor readings or module operation.

When to See a Shop: If your AC is blowing consistently warm air and simple reboots haven't resolved the issue, it's time to schedule a service appointment with Tesla. Diagnosing refrigerant leaks, compressor failures, or other component issues requires specialized tools (e.g., refrigerant gauges, leak detectors) and expertise. Continuing to drive without AC isn't harmful to the car, but it's crucial for your comfort and, in some cases, for the thermal management of the battery, which can be indirectly affected if the cabin gets excessively hot.

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