Model 3/Y refresh 2021: heat pump issues (sensors/PT-sensors, software)

Symptoms

• No heat in frost, HVAC errors. On early batches — increased component wear due to coolant shortage.

What was done

• Software updates (closing "stuck" valve positions).
• Service bulletins for replacement of three PT-sensors of the heat pump.
• For mechanical damage — replacement of components (supermanifold/octovalve, etc.).

Belarus budget

≈ $900–2 000 depending on the scope of replacement.

Links

• NHTSA Recall report (heating/defrosting): https://static.nhtsa.gov/odi/rcl/2022/RCLRPT-22V050-5142.PDF
• Consumer Reports on the recall: https://www.consumerreports.org/cars/car-recalls-defects/tesla-recall-faulty-heat-pump-loss-of-heating-a5384954255/
• PT-sensor bulletin: https://static.nhtsa.gov/odi/tsbs/2022/MC-10226577-9999.pdf

Community experience TESLA Belarus

Analysis of 400,000 messages from the TESLA owner's group BELARUS chat — topic #1 by discussion volume.

Additional fixes from chat:

1. First check the refrigerant level — often the issue is solved by a simple top-up (e.g. near ЭлектроЭра in Minsk).
2. For Denso compressors: in the config you can lower the rpm from 11,000 to 8,000 — Tesla itself fixed this in software in later firmware.
3. R1234yf refrigerant can be replaced with R134a — they are interchangeable, R134a is significantly cheaper. A full replacement with vacuum is required.
4. Worst case — compressor replacement. A new one from a 2023–2024 car costs $800–900, you can sell your old one for $500–600.
5. Smell from the AC is a separate issue: replace cabin filters + ozonate the cabin.

Who reported the issue: Ilya, Егор, Егор Десятов, Dmitry Mel, spadar, Danilius

Who found the fix: firago, Vitali K, P M, fl, Uladzislau, Илья Воронцов

Discussion in Telegram: #147798, #385822, #378444, #109399

Additional sources:

• Tesla heat pump problem explained in NHTSA recall (Electrek): https://electrek.co/2022/02/09/tesla-heat-pump-problem-causing-loss-heat-explained-nhtsa-recall/