Rad Hose Upper 21501-FJ100

🔧 Component Type: Upper Radiator Hose
📂 Category: Cooling System – Engine
🚙 Common Application: Nissan and related vehicle models (varies by region and year)

📏 Key Specifications

• 📐 Hose Type: Pre-molded rubber hose

• 🔄 Orientation: Upper (connects radiator to engine block or thermostat housing)

• 🔩 End ID (Inner Diameter): ~30–40 mm (varies slightly by model)

• 🔥 Temp Rating: Engine coolant range – typically up to 120°C (248°F)

• 💧 Fluid Type: Engine coolant (50/50 antifreeze-water mix)

⚙️ Functionality

The upper radiator hose is a critical part of the cooling loop:

• ♻️ Transfers hot coolant from the engine ➡️ radiator

• 🌡️ Helps regulate engine temperature by allowing coolant to circulate

• 🔒 Maintains pressure integrity in the cooling system

🛠️ Maintenance Tips

• 🧼 Check for soft spots, cracks, or bulges – signs of degradation

• 💦 Look for coolant leaks or white crust near hose clamps

• 🔁 Replace during major coolant service intervals or overheating issues

• ⚠️ Never remove while hot – coolant under pressure can cause burns

• 🧰 Use new hose clamps when replacing for secure sealing