Parts for your 2006 Honda Stream-Radiator hose

2006 Honda Stream Radiator Hose: Purpose, Care, and When to Replace

Technical sources including the Honda Stream RN6–RN9 workshop manual, Honda’s Electronic Parts Catalogue (EPC), and common OEM supplier catalogues (e.g., Mackay Rubber, Gates) list both upper and lower radiator hoses for the 2006 Honda Stream (R18A 1.8L and K20-series 2.0L). So yes—radiator hoses are absolutely used on this model and they’re essential to its cooling system.

The radiator hose’s job is simple but critical: move coolant between the engine and radiator so heat can be dumped to the airflow. The upper hose carries hot coolant out of the engine to the radiator, the lower hose returns cooled coolant back in. Good hoses maintain pressure, resist heat, oil, and ozone, and keep their shape so the Stream doesn’t run hot under the bonnet—whether it’s the school run or a long Kiwi road trip.

For servicing a 2006 Honda Stream, checking the radiator hoses should be routine. Look for soft spots, cracks, swelling at the ends, crusty deposits near clamps, or coolant stains. If the rubber feels spongy, or the hose is oil-soaked or bulged, it’s time to replace. As a rule of thumb, expect 5–7 years of life, many shops recommend replacement around 100,000–150,000 kilometres, sooner in hot climates or if towing.

When fitting new hoses, choose EPDM hoses that meet or exceed OEM spec. Spring (constant-tension) clamps are preferred on Hondas—replace tired clamps rather than reusing them. It’s smart to do upper and lower hoses together, and inspect heater and bypass hoses at the same time.

• Drain coolant safely, catching it in a clean tray (it’s toxic to pets).
• Remove old clamps, twist hoses gently to break the seal, then pull off.
• Clean stubs/necks, no gouging with a screwdriver.
• Fit hoses without kinks, position clamps behind the bead, and orient spring clamps correctly.
• Refill with Honda Type 2 premix (blue) or an equivalent silicate-free coolant, avoid topping with plain water.
• Bleed air with the heater on hot, run until the fan cycles and recheck the level.

Watch for tell-tales of trouble: creeping temperature gauge, sweet coolant smell, steam, or a hose collapsing under revs (often a radiator cap or return-line issue). Given model variations (1.8 vs 2.0), confirm hose fitment by VIN for the best result.

How often should the 2006 Honda Stream’s radiator hoses be replaced?

Most owners will be well served replacing hoses every 5–7 years or around 100,000–150,000 kilometres. If the vehicle sees lots of heat, towing, or city stop–start, bring that forward. Always replace immediately if there are cracks, swelling, leaks, or soft spots.

What coolant should be used after replacing a radiator hose?

Use Honda Type 2 premixed coolant (blue) or an equivalent long-life, silicate-free coolant compatible with Honda aluminium engines. Don’t mix types, if uncertain, drain and refill with fresh, correct-spec coolant to the proper concentration.

Are the 1.8 and 2.0 Stream radiator hoses interchangeable?

Generally no. The RN6/RN7 (1.8 R18A) and RN8/RN9 (2.0 K-series) have different hose shapes and lengths. Always match by engine code and VIN, and check the EPC or supplier catalogue to ensure the right upper and lower hoses.