2015 Toyota Highlander: Coolant Capacity & Type
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The 2015 Toyota Highlander holds between 6.5 and 10.1 quarts (6.2 - 9.6 Liters) of engine coolant depending on the engine option.
Quick Answer
- Total Cooling System Capacity:
- 2.7L 4-Cylinder (2AR-FE): 6.5 quarts (6.2 Liters)
- 3.5L V6 (2GR-FE): 10.1 quarts (9.6 Liters)
- OEM Coolant Spec: Toyota Super Long Life Coolant (SLLC)
- Color: Pink
- Chemistry: P-HOAT (Phosphated Hybrid Organic Acid Technology)
- Mix Ratio: 50/50 with deionized or distilled water. Toyota SLLC is typically sold as a pre-mixed 50/50 solution.
Capacity by Engine Option
| Engine | Total Capacity (Quarts) | Total Capacity (Liters) |
|---|---|---|
| 2.7L I4 (2AR-FE) | 6.5 | 6.2 |
| 3.5L V6 (2GR-FE) | 10.1 | 9.6 |
Flush Interval
Toyota Super Long Life Coolant is designed for extended service intervals. The initial factory fill is intended to last for a significant period, with subsequent changes occurring at shorter intervals.
- Initial Flush: 10 years or 100,000 miles.
- Subsequent Flushes: Every 5 years or 50,000 miles thereafter.
Using a non-OEM coolant may require more frequent changes. Always refer to the owner's manual for the most accurate maintenance schedule for your specific driving conditions.
How to Refill & Bleed
Properly refilling and bleeding the cooling system is crucial to prevent overheating caused by air pockets. The 2015 Highlander has a straightforward process.
- Refill: After draining the old coolant, slowly pour the 50/50 pre-mixed Toyota SLLC into the radiator until it is full.
- Bleed Air:
- Fill the coolant reservoir to the "FULL" line.
- Leave the radiator cap off.
- Start the engine and let it idle. Set the heater to the highest temperature and the fan to the lowest setting. This ensures the heater core is opened, allowing coolant to circulate through it.
- As the engine warms up, the thermostat will open, and the coolant level in the radiator will drop. Continue to top off the radiator as the level goes down and air bubbles escape.
- Once the radiator cooling fans have cycled on and off at least once and no more bubbles are appearing, the system should be bled. Top off the radiator one last time and securely install the radiator cap.
- Re-check the coolant level in the reservoir and top off as needed. Check the level again after the vehicle has cooled down completely.
Common Cooling System Issues
The third-generation Highlander (2014-2019) is known for its reliability, and its cooling system is generally robust. However, one issue to be aware of is potential water pump seepage or failure. While not extremely common, it is the most frequently reported cooling system problem for this generation. Symptoms include a slow coolant leak from the passenger side of the engine, a low coolant light, or engine overheating.
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More specs for the 2015 Toyota Highlander
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2015 Toyota Highlander Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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