2016-2021 Tesla Model S & 2012-2021 Cooling Auxiliary Coolant Water Pump | 1037327-00-F

The Unsung Hero of Your Tesla’s Thermal Management

Key Functions: Beyond “Just Circulating Coolant”

• Battery Thermal Safeguard: During DC fast charging, the pump accelerates coolant flow to dissipate heat from the battery pack, preventing overheating that would otherwise slow charging or trigger safety cutoffs.
• Motor & Inverter Cooling: When pushing your Model S in Sport mode, the pump redirects coolant to the motor inverters—critical components that convert DC power to AC for the motors—keeping them within optimal operating temps (185-200°F).
• Climate System Support: Works with the HVAC loop to maintain cabin temperature efficiency, even when the main pump is focused on powertrain cooling. No more sacrificing AC performance during hard drives.
• Post-Shutdown Cooling: Continues running for up to 10 minutes after you turn off the car, bleeding residual heat from the battery and motors to prevent long-term thermal stress.

Signs Your Auxiliary Pump Needs Replacement

• Overheating Alerts: “Battery Temp High” or “Motor Inverter Hot” warnings, especially during charging or high-speed driving.
• Reduced Charging Speed: The car limits fast charging to 50% or less, a protective measure when the battery can’t cool properly.
• Unusual Noises: A high-pitched whine or grinding sound from the front of the vehicle (near the radiator) when the car is on or charging.
• HVAC Inefficiency: Cabin AC takes longer to cool, or blows warm air intermittently—often a sign the pump isn’t supporting the climate loop.

Technical Specifications (At a Glance)

Why It Outperforms Aftermarket Alternatives

• Tesla-Calibrated Flow: The impeller is engineered to match the pressure demands of Model S’s secondary cooling loops, preventing under/over-circulation that can damage components.
• High-Temp Resilience: The housing uses heat-resistant polymer that won’t warp when exposed to hot coolant (up to 221°F), unlike cheap plastic pumps that crack under stress.
• Quiet Operation: Equipped with a noise-dampening bearing system that operates at <45dB—so you won’t hear it over road noise or the car’s cabin.
• Plug-and-Play Fit: Includes pre-wired connectors and mounting brackets that align perfectly with Model S’s cooling system. No splicing or modifications needed.

Installation & What You Get

• 1x Auxiliary Coolant Water Pump (1037327-00-F)
• Mounting hardware (bolts, gaskets)
• Digital Installation Guide: Step-by-step photos showing access points (near the front radiator) and torque specs (8 Nm for mounting bolts).