Engine Cooling & Accessory Drive Belt — OE 11720JG30B ?

This premium fan/serpentine belt keeps your engine systems in sync. It transfers power from the crankshaft to the alternator, water pump, A/C compressor, and (where equipped) radiator fan. Without a healthy belt, charging, cooling, and comfort features cannot work as designed.

Why you need it ✅

A fresh belt maintains correct coolant flow, stable battery charge, strong steering assist, and cold A/C. It ensures quiet operation, better efficiency, and protects the engine in traffic, heat, and long trips.

How it works ⚙️

A multi‑rib EPDM belt wraps the crank pulley, tensioner, and accessory pulleys. Ribbed contact increases grip, while the automatic tensioner holds constant load for slip‑free drive. Correct OEM length and rib count keep alignment true, reduce noise, and minimize wear under heat, dust, and moisture.

What happens if it’s worn or broken ⚠️

Common signs: cold‑start squeal, cracks, glazing, frayed edges, or missing ribs; dim lights, weak A/C, heavy steering, vibration, and rising temp. If it snaps: instant loss of charging, coolant circulation stops, rapid overheating, potential head‑gasket damage, and roadside breakdown. Replace at the first wear signs or around scheduled intervals; inspect tensioner and idlers together.

Fitment notes

Direct‑fit OE 11720JG30B with precise length and rib profile for a quick, clean install. Follow the under‑hood routing diagram and verify pulley alignment after tensioning.

Compatibility

• X-Trail
• Rogue
• Elgrand