2018 Toyota Mirai Coolant in Peoria, AZ

Warning lights, fluctuating temperature readings, low coolant in the reservoir, or visible leaks are common signs your 2018 Toyota Mirai needs cooling system service.

Sweet or chemical odors near the front of the vehicle, dried coolant residue, and cooling fans running more often than usual also merit attention. Check levels only when the vehicle is cold—the system is pressurized and can be hot after running. A professional pressure test and coolant analysis at Larry H. Miller Toyota Peoria can confirm what’s needed and why.

• Temperature or system warning indicator illuminated
• Low reservoir level or recurring top-offs
• Visible drips, stains, or crusted coolant at fittings

A Mirai coolant service includes draining the cooling circuits, testing for leaks, inspecting hoses and pumps, and refilling with the manufacturer-specified coolant.

Technicians also check cap integrity, verify sensor readings, and bleed the system per factory procedure to restore proper flow and temperature control. On a 2018 Toyota Mirai, that means attention to the fuel cell stack loop and electric drive components so heat is managed consistently under load.

• Drain and refill per factory method
• Cooling system pressure test and leak check
• Inspection of hoses, fittings, caps, and electric pumps

The manufacturer publishes the maintenance schedule for the 2018 Toyota Mirai, and that schedule determines when coolant should be changed.

Between scheduled services, technicians can test coolant condition to verify inhibitor strength and confirm it’s protecting aluminum components effectively. If testing shows depleted additives or contamination, service is recommended even if appearance seems normal. Follow the published schedule and use interim testing for peace of mind.

• Follow the factory maintenance schedule
• Use condition testing between intervals
• Service early if tests show depleted protection

The 2018 Toyota Mirai uses a coolant type specified by the manufacturer for this vehicle, and coolants are not interchangeable.

Color is not a reliable guide to what’s in the bottle; only the correct specification ensures proper corrosion protection and heat transfer for the Mirai’s fuel cell and electric drive. At Larry H. Miller Toyota Peoria, we refill with the exact type and mixture the manufacturer specifies for this model.

• Use only the manufacturer-specified coolant
• Do not rely on color to identify type
• Correct coolant protects aluminum and seals

Topping off restores level but does not refresh depleted additives, and a recurring drop in level points to a leak that needs inspection.

Check levels only when the Mirai is cold; the system is under pressure when hot. If you add fluid frequently, schedule a pressure test to locate the cause. A full service replaces aged coolant, restores inhibitor strength, and verifies sealing so temperatures remain stable.

• Only check and add when the system is cold
• Frequent top-offs indicate a leak, not normal use
• Service restores corrosion protection and flow

You can schedule service or schedule appointment online, or call our team for help.

For convenience, review current service specials before you book. If you prefer in-person support, visit us at 8633 W Bell Rd, Peoria, AZ 85382. We’ll test your 2018 Toyota Mirai’s coolant, inspect for leaks, and perform factory-approved service.

• Book online in minutes
• Check service specials before you visit
• Call or stop by our Peoria location for assistance