45161SA000 Subaru HOSE RAD UPR, Price: 10.71$, Weight: 0.212kg

Upper Radiator Hose for Subaru Cooling System

This molded upper hose links the engine outlet to the radiator top tank. It carries hot coolant, stabilizes temperature, and keeps your Forester running cool. Built from heat‑resistant EPDM rubber with formed bends, it resists collapse, vibration, and pressure for long service.

How it works

When the thermostat opens, the water pump pushes hot coolant through this hose into the radiator. Airflow removes heat, then coolant returns via the lower hose. Spring or worm clamps seal the ends to prevent seepage and maintain system pressure.

Why you need it ✅

Age, oil splash, and ozone make hoses hard, cracked, or swollen. Upper radiator hose replacement restores safe flow and prevents sudden leaks. Signs: bulges, soft spots, dried coolant crust, sweet smell, low coolant, or temp gauge spikes. Replace at the first warning.

If it fails ⚠️

A split hose dumps coolant quickly, causing overheating, steam, warped heads, or head‑gasket damage. You may lose cabin heat and the ECU can enter limp mode. Stop the engine immediately to avoid costly repairs.

Install tips

Work on a cold engine. Drain enough coolant, remove old clamps, clean necks, and fit new clamps. Route the molded bends correctly, avoid twisting, and bleed air after refill with the correct antifreeze mix. Check for leaks under operating temperature.

Specs

EPDM rubber, molded OE fit, heat rating to ~120°C, typical cooling system pressure ~1.2 bar, kink‑resistant under vacuum during cooldown. Ideal as a preventive cooling system hose service item.

Compatibility

• Forester