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PHEV Battery Coolant Flush on 2022 Outlander PHEV

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Dan C. · rep 0 · May 22, 5:36 AM · 1 replies · solved · Question

Vehicle: 2022 Mitsubishi Outlander PHEV GT

Hello ClearTheCode community,

I own a 2022 Mitsubishi Outlander PHEV GT, and I'm trying to get a handle on all the specific maintenance items for a plug-in hybrid. I know there's engine coolant, but I've also heard about a separate cooling system for the high-voltage battery and other hybrid components.

What's the recommended maintenance schedule for the PHEV battery coolant? Is it a different type of coolant than the engine uses? And is this something a DIYer can tackle, or is it strictly a dealer-only service due to the high-voltage nature of the system? Any insights would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:36 AM

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ClearTheCode admin answer:

  1. Dual Cooling Systems: You are absolutely correct! Your 2022 Mitsubishi Outlander PHEV GT has two distinct cooling systems: one for the internal combustion engine and another, separate system for the high-voltage battery pack and power electronics (inverter, motor-generators). These systems use different coolants and have different maintenance schedules.

  2. PHEV Battery Coolant Type: The high-voltage battery and inverter cooling system typically uses a specialized, long-life coolant, often a specific color (e.g., blue or pink) and formulated to be non-conductive and compatible with the materials in the hybrid system. It is NOT the same as the engine coolant and should never be mixed or interchanged. Always refer to your owner's manual for the exact specification, but it's usually a Mitsubishi-specific Super Long Life Coolant (SLLC).

  3. Maintenance Schedule: The battery/inverter cooling system generally has a much longer service interval than the engine coolant. Mitsubishi typically recommends inspecting the fluid level during routine service, but a full flush and replacement might be specified at intervals like 100,000 to 120,000 miles, or even longer, depending on the specific model year and region. Always consult your owner's manual or a Mitsubishi service schedule for precise intervals.

  4. DIY vs. Professional Service: This is where caution is paramount. While checking the reservoir level might be possible for a DIYer, performing a full flush and refill of the high-voltage battery cooling system is strongly recommended to be done by a certified Mitsubishi technician or a hybrid specialist.

    • High Voltage Risk: The system is connected to high-voltage components, posing a serious electrical shock hazard if not handled correctly.
    • Specialized Tools: Proper bleeding procedures are critical to ensure no air pockets remain, which can lead to overheating and damage to expensive hybrid components. This often requires specialized vacuum fill tools and diagnostic equipment to cycle pumps and monitor temperatures.
    • Specific Coolant: Using the wrong coolant can damage the system and void warranties.

  5. When to See a Shop: For any maintenance beyond simply checking the reservoir level, especially for a flush or if you suspect an issue with the battery cooling system (e.g., warning lights, unusual noises), take your Outlander PHEV to an authorized Mitsubishi dealer. Their technicians are trained and equipped to safely and correctly service these complex hybrid systems.

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