2026-07-21 · 4 min read
Toyota Vellfire Inverter Coolant Malaysia
Toyota Vellfire Inverter Coolant guide and repair information for Malaysia owners.
Vellfire Inverter Coolant — The Forgotten Fluid
The inverter coolant circuit on the Vellfire is separate from the engine coolant circuit — it cools the power control unit (PCU), inverter, and DC-DC converter. Most workshops — including many Toyota dealers — service only the engine coolant and ignore this circuit. The recommended interval is every 80,000 km or 4 years. Neglected inverter coolant becomes acidic and causes internal corrosion of the PCU heat exchanger, leading to expensive hybrid system failures.
What to Ask Your Workshop
- Ask specifically: 'Please check and service the inverter coolant circuit, not just the engine coolant'
- Toyota Genuine Inverter Coolant (pink) — do not substitute with generic long-life coolant
- Cost to flush inverter circuit at our Bandar Sri Damansara workshop
- Interval: every 80,000 km or 4 years — do not skip