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Gates 51750 HVAC Heater Hose - Reservoir (Lower)
Gates Molded Coolant Hose for BMW 525i and 530i
Gates 51750 is a molded HVAC heater hose built for specific BMW cooling-system applications. It follows OEM-style routing and integrates the molded branch and quick-connect features needed for a precise reservoir lower hose replacement on select 2004-2005 BMW 525i and 530i models.
Key Features
- Gates Molded Coolant Hose line for application-specific fitment
- OEM-style molded construction for the lower reservoir hose route
- Material blend of EPDM, plastic, and steel for cooling-system use
- Integrated modular design with one branch and three female quick connectors
- Centerline length: 71 in. (1803 mm)
- End inside diameters: 20 mm / 20 mm / 16.5 mm
- Direct replacement reference: Gates 51750
Product Details
This Gates 51750 molded coolant hose is part of the Gates Modular Coolant Hose program, which is built for specific vehicle applications and mirrors the OE layout with integrated components such as branches and quick-connectors. For BMW 525i and BMW 530i models, the molded shape helps maintain the original hose path at the reservoir lower position, supporting a clean and accurate replacement. This part cross-references Genuine 17127519258 and Rein CHE0493 for the same application.
Common Problems This Hose Can Address
- Cracked or brittle lower reservoir hose sections
- Coolant seepage at molded hose bends or connector points
- Improper hose routing after a failed replacement hose
- Loss of sealing at quick-connect interfaces
- Cooling-system service needs on aging BMW 525i and 530i vehicles
Installation Notes and Tips
Verify the reservoir lower hose routing and connector style before installation. Inspect mating fittings, seals, and nearby plastic components for wear or damage, and replace any compromised parts before refilling the cooling system. Confirm the hose path matches the original layout on the vehicle to avoid stress at the molded bends and connector ends.
Quality Assurance
Gates is a recognized aftermarket supplier of modular coolant hose assemblies, with products engineered to match specific OE-style applications and integrated component layouts. Gates 51750 is built for the listed BMW fitments and follows the dimensional and connector requirements shown in the product data.
| Brand | Gates |
|---|---|
| Part Number | 51750 |
| Position | Molded Coolant Hose, Reservoir (Lower) |
| Material | Epdm, plastic, steel |
| End 1 Inside Diameter | .8 |
| End 1 Inside Diameter | 20 |
| End 2 Inside Diameter | .8 |
| End 2 Inside Diameter | 20 |
| Contains Spring | No |
| Centerline Length | 17 |
| Centerline Length | 1803 |
| Centerline Length | 71 |
| End 3 Inside Diameter | .65 |
| Branch Quantity | 1 |
| 9839 | Yes |
| 9845 | 3 |
| Modular Components | Branch, 3 female quick connectors |
| Modular Hose | Yes |
This part fits 4 vehicles. Search below:
| Year | Make | Model | Transmission | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2005 | BMW | 525i | Automatic | 2.5L | L6 | GAS | Reservoir (Lower) | Molded Coolant Hose |
| 2005 | BMW | 530i | Automatic | 3.0L | L6 | GAS | Reservoir (Lower) | Molded Coolant Hose |
| 2004 | BMW | 525i | Automatic | 2.5L | L6 | GAS | Reservoir (Lower) | Molded Coolant Hose |
| 2004 | BMW | 530i | Automatic | 3.0L | L6 | GAS | Reservoir (Lower) | Molded Coolant Hose |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.