Description
Nissan Engine Cooling Hose (21045-42B03) – Technical Specifications
1. Core Specifications
- OEM Part Number: 21045-42B03
- Type: Heater hose (connects engine to heater core)
- Material: Reinforced EPDM rubber (heat-resistant, ozone-resistant)
- Length: ~45 cm (varies by application)
- Diameter: Inner 16mm / Outer 24mm
- Max Temp: +125°C continuous / +150°C peak
- Pressure Rating: 1.2 bar
2. Vehicle Compatibility
Fits Nissan models with SR20DE, QR25DE, and VQ35DE engines, including:
| Model | Engine | Years | Notes |
|---|---|---|---|
| Nissan X-Trail (T30) | 2.5L QR25DE | 2001–2007 | Lower heater hose |
| Nissan Altima (L31) | 2.5L QR25DE | 2002–2006 | Firewall connection |
| Nissan Maxima (A34) | 3.5L VQ35DE | 2004–2008 | Requires special clamp |
| Nissan Sentra (B15) | 2.0L SR20DE | 2000–2006 | Common failure point |
3. Key Identification Features
✔ Pre-molded 90° bend near firewall connection
✔ Nissan PN embossed on hose surface
✔ Reinforced fabric lining (prevents collapse under vacuum)
✔ Factory-installed spring guard (protects against abrasion)
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