Description
The DMH3647-CH3647 THROTTLE BY PASS HOSE is a precision-engineered replacement part designed for the Nissan Patrol ST series manufactured between 2001 and 2012. Built for 4-door models equipped with the 4.8-litre inline-6 24-valve engine, this hose plays a vital role in the cooling and air management system. By ensuring proper coolant circulation around the throttle body, it helps regulate operating temperature, prevents overheating, and supports smooth engine performance.
🔧 Key Features
OEM Fitment
Exact compatibility with Nissan Patrol ST (2001–2012).
Designed for 4.8L I6 24V engines.
Fits seamlessly in 4-door configurations.
Molded to match factory routing for straightforward installation.
Durable Construction
Made from reinforced EPDM rubber for superior resistance to heat and chemicals.
Withstands operating temperatures up to 150°C.
Flexible enough to absorb vibration and engine movement.
Resistant to cracking, swelling, and hardening over time.
Reliable Performance
Provides leak-free coolant transfer in the throttle bypass circuit.
Ensures consistent throttle body temperature regulation.
Supports overall cooling system efficiency and engine longevity.
🛠️ Installation Guide
Step-by-Step Process
Allow the engine to cool completely before starting.
Drain coolant into a container to prevent spills.
Remove the old bypass hose by loosening clamps.
Fit the DMH3647-CH3647 hose in place, aligning with factory routing.
Secure with clamps and refill coolant.
Bleed the system to remove air pockets.
Check for leaks and test throttle body function.
Tools required: Screwdrivers, pliers, drain pan, coolant, replacement clamps.
🚨 Signs Your Throttle Bypass Hose Needs Replacement
Coolant leaks near the throttle body.
Visible cracks or bulges on the hose surface.
Soft or spongy texture when squeezed.
Engine overheating despite proper coolant levels.
Erratic idle or performance caused by improper temperature regulation.
🛒 Availability
The DMH3647-CH3647 throttle bypass hose can be purchased from:
Nissan parts distributors.
Auto parts retailers (local and online).
Specialized suppliers for Patrol components.
🧊 Maintenance Tips
Inspect hoses every 12 months or 20,000 km.
Replace hoses every 4–5 years or sooner if wear is detected.
Use OEM-approved coolant to extend hose life.
Check clamps regularly for corrosion or looseness.
✅ Conclusion
The DMH3647-CH3647 throttle bypass hose is a dependable replacement for Nissan Patrol ST models (2001–2012, 4-door, 4.8L I6 24V engines). With its OEM fitment, durable EPDM construction, and reliable performance, it ensures proper coolant circulation and stable throttle body temperatures. Timely replacement of worn hoses prevents leaks, overheating, and costly engine damage, keeping your Nissan Patrol running smoothly and efficiently.
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