Parts for your 2012 Honda Stream-Radiator hose

2012 Honda Stream radiator hose — what it does and how to look after it

Radiator hoses are absolutely used on the 2012 Honda Stream. Technical references including the Honda Stream (RN6–RN9) Service Manual cooling system section and the Honda Electronic Parts Catalogue identify both an “upper radiator hose” and a “lower radiator hose” for the 1.8‑litre and 2.0‑litre i‑VTEC engines. Major aftermarket catalogues from well‑known brands also list direct‑fit upper and lower hoses for this model year, confirming their fitment and relevance.

On this Honda, the upper hose carries hot coolant from the engine to the radiator, while the lower hose feeds cooled coolant back to the water pump. Together, they’re the flexible arteries of the cooling system, allowing the engine to manage temperature under load, on long Kiwi or Aussie highways, and in stop‑start traffic. Made from heat‑resistant EPDM rubber with constant‑tension clamps, they handle vibration, thermal cycling, and pressure changes every time the car is driven.

Because hose failure can quickly lead to overheating, warped heads, or a blown gasket, keeping these hoses in good nick is smart preventative maintenance. Many technicians recommend inspecting them at every service and replacing them at the first sign of ageing rather than waiting for a leak to appear.

• Inspection habits: Check hoses stone‑cold. Look and feel for cracks, glazing, swelling, soft spots, or oil contamination. Squeeze gently, a hose that feels mushy or excessively hard is due for replacement.
• Preventative intervals: Consider replacement around 100,000–150,000 km or 6–8 years, earlier in hot or harsh conditions. It’s common practice to replace upper and lower hoses together.
• Clamps and sealing: Use new constant‑tension/spring clamps or quality worm‑drive clamps. Position them behind the bead on the radiator and thermostat necks.
• Coolant and bleeding: Refill with the correct Honda Type 2 long‑life coolant (blue) at the specified mix. Bleed the system properly to avoid air locks, run the heater on hot, top up as the level drops, and recheck the reservoir after a full heat cycle.
• Routing and clearance: Ensure hoses follow factory routing with no kinks or chafe points, and adequate clearance from belts and fans.

For anyone servicing a 2012 Honda Stream, fresh hoses and the right coolant are inexpensive insurance. A straightforward hose swap and system bleed can save a weekend, a tow, and a costly cylinder‑head repair.

Does a 2012 Honda Stream actually have radiator hoses?

Yes. The Honda service manual and the Honda EPC list both upper and lower radiator hoses for RN6–RN9 Stream variants. They’re standard parts on the liquid‑cooled i‑VTEC engines.

How often should the radiator hoses be replaced on a 2012 Honda Stream?

Inspect at every service and consider preventative replacement around 100,000–150,000 km or 6–8 years. Replace sooner if there are signs of ageing like cracks, bulges, soft spots, or leaks.

What are the warning signs of a failing radiator hose?

Low coolant level, a sweet coolant smell, visible drips, white crust at hose ends, temperature gauge creeping up, swollen or spongy hose sections, or steam from the bonnet. If any appear, park up and address it promptly.