2018 Toyota Highlander Serpentine Belt: Routing, Replacement, and Part Numbers
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick answer:
- Belt Length: Approximately 96.5 inches (check specific engine as variations exist)
- Rib Count: 6-rib
- OEM Belt PN (3.5L V6): Toyota 90916-A2022
- Aftermarket Cross-references:
- Gates K060965
- Dayco 5060965
- Continental Elite 4060965
- Auto-Tensioner PN (3.5L V6): Toyota 16620-0P030 (Aftermarket: Gates 38337, Dayco 89337)
- Idler Pulley PN (3.5L V6): Toyota 16603-0P030 (Aftermarket: Gates 36248, Dayco 89047)
Belt Routing (3.5L V6 Engine)
Before you begin, always take a clear photo of your existing belt routing! This will be your most valuable reference during reinstallation. The serpentine belt on your 2018 Toyota Highlander with the 3.5L V6 engine powers several crucial accessories. Here's a common routing path:
- Begin at the Crankshaft Pulley (the largest pulley at the bottom, directly driven by the engine).
- From the crankshaft, the belt typically goes up and to the left to the A/C Compressor Pulley.
- From the A/C compressor, it will often route to an Idler Pulley (a smooth, non-driven pulley used for belt alignment and tension).
- Next, the belt wraps around the Alternator Pulley (usually high on the engine, responsible for charging the battery).
- From the alternator, it makes its way to the Power Steering Pump Pulley.
- The belt then typically routes to the Water Pump Pulley (responsible for circulating coolant).
- Finally, the belt finishes its path by wrapping around the Automatic Belt Tensioner Pulley, which maintains proper belt tension.
Note: While this describes a common routing, slight variations can exist. Always consult your vehicle's specific diagram (if available in your owner's manual or service manual) or, better yet, photograph the existing belt before removal.
How to Replace the Serpentine Belt
Replacing the serpentine belt on your 2018 Toyota Highlander generally requires a serpentine belt tool or a long-handled 3/8
More specs for the 2018 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.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
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.
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
2018 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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