Coolant Pump – 2.X Series

Tesla Roadster 2.x — Magnetic-Drive Coolant Pumps (Pair Replacement)

The 2.0 and 2.5 Roadsters upgrade the ESS cooling loop from the older 1.5 series brush-motor pump to two
magnetic-drive coolant pumps. Instead of one pump doing all the work, these cars use a dual-pump layout to circulate coolant through the battery pack and heat-exchanger—delivering higher reliability and better thermal stability under charge and load.

A magnetic-drive pump spins the impeller via a magnetic coupling—no direct motor shaft, brushes, or dynamic shaft seal in the coolant path—so there’s no brush dust and fewer wear items compared with a traditional centrifugal pump. This is a vast improvement over the 1.5 series DC brush-motor pump.

Why these pumps need periodic replacement

• Bearing & coupling fatigue — Over time, internal bearings and the magnetic coupling lose efficiency, reducing flow.
• Impeller/volute wear — Particulates or erosion diminish head/flow performance.
• Noise escalation — The most common field symptom is increasing mechanical/whine noise prior to failure.

Replace in pairs. The system is balanced for two identical pumps. Replacing only one can leave uneven flow and mismatched duty cycles.
(PLEASE SELECT TWO)

Our solution

• Direct-fit 2.x pumps — Correct hose orientation and electrical connectors for Roadster 2.0/2.5.
• Brushless magnetic-drive — No brushes to shed carbon; clean, efficient operation.
• Bench-verified — Each unit checked for current draw and flow at operating head before shipment.
• Service interval — Proactive replacement every 5–7 years (usage and heat dependent).

Installation & notes

• Pair logic — Always install two matched pumps to maintain balanced flow and equal duty.
• Bleed procedure — Command pumps and purge air to restore full head/flow; recheck coolant level warm and cold.
• Hoses & clamps — Replace brittle hoses; verify no suction-side collapse at high duty.

Included in ESS service

Pump inspection/replacement is a standard reliability item during our Roadster battery/ESS service and thermal-system refresh.

Maintenance Tip:
Replace pumps as a matched pair. After installation, run a full bleed cycle and confirm both pumps meet spec current draw and flow.  50/50 water/propylene-glycol (Green Color Glycol) mix designed for aluminum systems. After any pump service, vacuum-fill and bleed the loop to remove air pockets that can starve the pump and reduce cooling performance.