Tesla Model 3 & Y Radiator (2017-2026): Heat Pump vs. PTC System Differences

Key Compatibility Warning: Heat Pump vs. PTC Heater Systems

The most critical factor when replacing a radiator in a Tesla Model 3 or Model Y is identifying the vehicle's thermal management system. There are two major versions, and the parts are not interchangeable.

• 2017-2020 Tesla Model 3 (Non-Heat Pump): These earlier models use a Positive Temperature Coefficient (PTC) resistive heater for the cabin. Their cooling system is less complex than later models. The radiator for these vehicles is specific to this system. A common part number for this era is 1077082-00-C.
• 2021+ Tesla Model 3 & 2020+ Tesla Model Y (Heat Pump): These vehicles feature a highly efficient heat pump system, which integrates heating and cooling for the cabin, battery, and drivetrain. This system, which includes the 'Octovalve' and 'Supermanifold', uses a different radiator design. 🎬 Watch: How Tesla's heat pump system works A common part number for these models is 1494175-00-B.
• 2024+ Model 3 'Highland' & 2025+ Model Y 'Juniper': These major vehicle refreshes include redesigned exteriors and updated thermal management systems. While they also use a heat pump, part numbers and designs may differ from the 2020-2023 versions. Always verify part numbers for these newer models.

Symptoms of Radiator & Cooling System Failure

A problem with the radiator or the broader thermal management system can present in several ways, often through warnings on the main touchscreen.

• Vehicle Overheating Warnings: The car will display alerts like "Pull over safely" or "Vehicle may not restart" if the battery or drivetrain components get too hot. This is the most serious symptom.
• Reduced Performance or Charging Speed: To protect the battery from overheating, the vehicle's computer will automatically limit motor power and reduce DC fast charging speeds.
• Coolant Leaks: You may find a puddle of pink or blue fluid under the front of the car. The coolant is Tesla's specific G-48 formula. Leaks can come from the radiator itself (often due to road debris damage) or from connecting hoses.
• Loud or Constantly Running Fans: If the radiator is clogged with debris or is failing, the cooling fans will run at high speed more frequently to try and compensate.
• Loss of Cabin Heat or A/C: In heat pump-equipped models, issues within the thermal management system can affect cabin climate control. A common issue is the failure of refrigerant pressure/temperature sensors, which can disable the heat pump.

Known Issues, Recalls, and Service Bulletins

• NHTSA Recall 22V-063 (Heat Pump Software): A February 2022 recall was issued for a software error on 2020-2022 Model Y and 2021-2022 Model 3 vehicles. The error could cause a valve to open unintentionally, trapping refrigerant and leading to decreased windshield defrosting performance in cold temperatures. This was addressed with an over-the-air (OTA) software update.
• TSB SB-21-18-002 (Faulty Sensors): A technical service bulletin addresses an issue on 2020-2021 models where refrigerant pressure/temperature sensors in the heat pump system can fail. This can cause a loss of both heating and cooling. The fix involves replacing the faulty sensors.
🎬 See: Troubleshooting Tesla HVAC and sensor failures
• Debris Accumulation: The front-facing radiator is susceptible to collecting bugs, leaves, and road debris. Over time, this can block airflow and significantly reduce cooling efficiency. Tesla has an official service procedure for cleaning the radiator, which involves removing the active grille shutter to gain access.

Buying a Used Radiator: What to Look For

A used OEM radiator can be a cost-effective solution, but careful inspection is key. Since this part is critical for battery health, getting a good one is essential.

1. Verify the Part Number: This is the most important step. Double-check that the part number matches your vehicle's system (PTC vs. Heat Pump). For example, 1077082-00-C is for older PTC models, while 1494175-00-B is for newer heat pump models.
2. Inspect the Fins: Look for extensive damage to the cooling fins. A few bent fins are normal and can be carefully straightened with a fin comb, but large areas of flattened or crushed fins will impede airflow and reduce performance.
3. Check for Corrosion: Examine the aluminum core and especially the areas where the aluminum meets the plastic end tanks. Heavy white, crusty corrosion is a red flag indicating a potential future leak.
4. Examine End Tanks and Connections: Inspect the plastic end tanks for any cracks, especially around the hose connection points. Check that the hose inlets/outlets are not cracked or deformed.
5. Ask About the Donor Vehicle: If possible, find out why the donor vehicle was salvaged. A part from a rear-end collision is generally preferable to one from a major front-end impact, which could have subjected the radiator to stress or hidden damage.

For a component like this, a used OEM part is often a better choice than a cheap aftermarket one. OEM parts guarantee perfect fitment for mounting points and hose connections, which is crucial in the tightly packaged front end of a Tesla.

Replacement Overview & Related Parts

Replacing the radiator on a Model 3 or Y is a moderately difficult job that requires specific procedures.

• Difficulty: The process involves removing the front bumper, frunk assembly, and active grille shutters to access the radiator.
• Coolant Service: The vehicle's cooling system must be drained and refilled. Tesla's service software (Toolbox 3) is used to run a special coolant bleed and fill procedure to prevent air pockets in the system, which can impede coolant flow.
• Related Parts to Consider:
  • Coolant: You will need to refill the system with Tesla's specified G-48 coolant (blue/green), which is typically a pre-mixed 50/50 solution. Do not add water or use other types of coolant.
  • Hoses and Clamps: It's good practice to inspect the radiator hoses for any swelling, cracking, or softness and replace them if they show signs of age.
  • Cooling Fan Assembly: The radiator is attached to the fan assembly. While you have it apart, check the fan for any damage or bearing noise.

Cost Comparison

Prices are estimates as of mid-2026 and can vary based on location and vehicle model. Shop labor includes draining and refilling the cooling system.

Frequently Asked Questions