Tesla LDU Coolant Delete Modification

Overview

The Large Drive Unit (LDU) in early Tesla Model S and X (2012-2020) uses internal coolant paths—including one through the rotor shaft—to manage heat. Unfortunately, the triple-lip rotor seals often leak over time, allowing coolant to flood the rotor, stator, and inverter. This can cause catastrophic electrical failures and high repair costs  .

What Does the Mod Do?

• Blocks coolant to the rotor shaft, eliminating the root cause of seal leaks.
• Preserves coolant flow to the stator, gearbox, and inverter via rerouting or manifold cap—effectively mimicking Tesla’s official Revision U design .
• Tesla has now adopted this design in their Revision U units since approximately 2023 .

Why It Matters

• Prevents catastrophic failures: With no route for coolant to breach the rotor, you avoid seal leaks, shorted windings, and complete drive unit failure .
• Cost-effective warranty alternative: LDU replacement can be $10-20 k; this mod is a fraction of that cost.
• Trusted practice: Widely adopted by specialist workshops and even recognized by Tesla in later revisions .

Common Concerns

• Increased rotor temperature: Without coolant, the rotor can run hotter—but components are rated for far more heat than normal driving produces. Failures from this are rare unless pushing the car on track or towing heavy loads .
• Engaging rinse→recovery: Many kits—including our approach—maintain flow to gearbox and inverter, avoiding issues like air pockets or overheating in other systems .

Why Choose Jaunt?

We’re the only workshop in Australia offering this full-service Tesla LDU Coolant Delete, backed by EV conversion-level expertise and a full machine shop.

What Sets Us Apart

• Thorough LDU preparation: Complete teardown, deep clean, and methodical inspection.
• Precision work: Milling out the stator delivery tube, installing the manifold cap, and applying Permatex high-temp sealant.
• OEM-grade standards: We replace all Tesla-specified single-use bolts and re-torque to factory settings.
• Upgrade bonuses: While the unit is accessible, we include half-shaft-seal replacement and precision rotor checks—no fluid intrusion goes unchecked.
• Delicate methods: We avoid wire brushes on critical parts to prevent debris, choosing gentler cleaning techniques.
• Bonus option: Full coolant system flush and replace service—perfect for cars over 8 years—to pair with the mod and ensure coolant quality.