DORMAN 01KW406 Outlet Radiator Coolant Hose Connector

( Brand: Dorman ), ( Manufacturer Part Number: 01KW406 ), ( Part Type: Outlet Radiator Hose ), ( Manufacturer Warranty: 1 Year ), ( Placement On Vehicle: Outlet ), ( Notes: Surge Tank To Engine ), ( Description: Coolant Hose Junction ), ( Short Description: Coolant Junction ), ( Package Contents: 1 Heater Connector / 3 Clamps ), ( Material: Carbon Steel ), ( Color: Silver ), ( Length: 3.48 In ), ( Cs-sku: 328 )

Review DORMAN Outlet Radiator Coolant Hose Connector Gmc fits SIERRA 2500 1999–2004

The **Dorman 01KW406 Outlet Radiator Coolant Hose Connector** is a high-quality, direct-fit replacement part designed specifically for the **1999 2004 GMC Sierra 2500 HD** and its Chevrolet counterpart, the **2000 2004 Silverado 2500 HD**, ensuring a seamless and reliable fit for your heavy-duty pickup s cooling system. Engineered to meet or exceed OEM standards, this durable **clamp-style hose connector** is crafted from **heat-resistant, flexible rubber** reinforced with a sturdy **wire braid or fabric casing**, providing long-lasting resistance to engine heat, oil, and coolant exposure while maintaining optimal flexibility to prevent cracking or kinking over time. The connector features a **precision-machined metal clamp** with a **screw-lock mechanism**, ensuring a secure, leak-proof seal that prevents coolant loss and overheating critical for maintaining engine performance and longevity, especially in demanding applications like towing or off-roading. Compatible with the **upper radiator hose outlet**, this connector is designed to withstand the high pressures and thermal fluctuations inherent in diesel and heavy-duty gasoline engines, offering a dependable alternative to worn or damaged factory parts. Whether replacing a failed clamp, addressing a slow coolant leak, or upgrading for added durability, the **Dorman 01KW406** delivers a straightforward, no-fuss installation with minimal tools required, making it an ideal choice for DIY mechanics and professional technicians alike. Built to restore your truck s cooling system to peak efficiency, this connector is a small but essential component that helps safeguard your engine from the risks of overheating and fluid loss.

### Pros and Cons of buying a Dorman 01KW406 Outlet Radiator Coolant Hose Connector for a 1999-2004 GMC Sierra 2500

1. **Direct Fitment** The Dorman 01KW406 is specifically designed for the 1999-2004 GMC Sierra 2500, ensuring compatibility without modification. This reduces the risk of installation issues or improper sizing.

2. **Quality Construction** Dorman is a well-known brand in the aftermarket automotive parts industry, known for durable materials and reliable performance. The hose connector is likely made from reinforced rubber or synthetic materials, resistant to heat, oil, and coolant degradation.

3. **Easy Installation** Since it is an OEM replacement part, the design should align with the original equipment, making installation straightforward for most DIYers with basic tools. No special equipment or expertise is typically required.

4. **Cost-Effective Solution** Replacing a faulty coolant hose connector is often cheaper than repairing or replacing the entire cooling system. The part itself is reasonably priced compared to labor costs if professional installation is needed.

5. **Prevents Cooling System Failures** A failing coolant hose connector can lead to coolant leaks, overheating, or even engine damage. Replacing it proactively can prevent costly repairs down the line.

6. **Widely Available** Dorman parts are stocked by most auto parts stores (AutoZone, O Reilly, Advance Auto, etc.), making it easy to purchase without long waits or special ordering.

7. **Compatibility with Other Dorman Parts** If you ve used Dorman parts before, this connector will integrate seamlessly with your existing cooling system components.

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1. **Potential Quality Variations** While Dorman is generally reliable, there have been occasional reports of inconsistent quality in aftermarket parts. Some users may receive a slightly cheaper version with shorter lifespan than the original equipment.

2. **Limited Longevity Compared to OEM** Original equipment parts often last longer than aftermarket replacements due to stricter manufacturing standards. The Dorman connector may wear out faster, especially if exposed to extreme heat or harsh conditions.

3. **No Warranty on Installation Issues** Dorman offers a limited warranty on manufacturing defects, but this does not cover improper installation or damage caused by misuse. If the part fails due to incorrect fitting (e.g., overtightening), the warranty may not cover it.

4. **Possible Counterfeit Parts** Purchasing from untrusted sellers (e.g., third-party online marketplaces) could result in counterfeit or substandard replicas. Always buy from reputable retailers to avoid this risk.

5. **Additional Costs** While the part itself is affordable, you may need to purchase additional supplies like clamps, gaskets, or coolant flush additives if the system hasn t been serviced recently. These extras add to the total cost.

6. **Risk of Overlooking Underlying Issues** If the coolant system has other problems (e.g., a failing water pump, cracked radiator, or clogged passages), replacing just the connector may not solve the root cause. A full cooling system inspection is advisable.

7. **Installation Challenges for Inexperienced DIYers** While the part is straightforward, working on a cooling system requires caution to avoid air pockets, leaks, or improper torque. Over-tightening clamps can damage the hose or connector.

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The Dorman 01KW406 outlet radiator coolant hose connector is a **practical and cost-effective choice** for replacing a failing part in your 1999-2004 GMC Sierra 2500. Its direct fitment, durability, and ease of installation make it a solid option for most drivers comfortable with basic automotive repairs. However, it is not without drawbacks potential quality inconsistencies, limited longevity compared to OEM parts, and the risk of counterfeit products necessitate careful purchasing and installation.

If you prioritize **reliability and longevity**, consider comparing it to other high-quality aftermarket brands like **Genuine OEM parts (if available), ACDelco, or Bosch**. If you re on a budget and trust Dorman s reputation, this part is a **safe and reasonable replacement**.

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1. **Purchase from a Reputable Retailer** Buy the Dorman 01KW406 from a well-known auto parts store (AutoZone, O Reilly, Advance Auto, or a trusted online retailer like Amazon or RockAuto) to avoid counterfeit parts.

2. **Inspect the Part Before Installation** Check the connector for visible defects, such as cracks, improper molding, or weak clamps. If it looks damaged, return it and request a replacement.

- Drain and flush the coolant system to remove old coolant and debris.

- Inspect the radiator, hoses, and clamps for leaks or wear.

- Replace any other worn components (e.g., clamps, gaskets) to prevent future issues.

4. **Follow Installation Guidelines Carefully**

- Ensure the vehicle is cool before working on the cooling system.

- Use the correct torque specifications for clamps (typically 10-15 ft-lbs for hose clamps).

- Avoid overtightening, which can damage the connector or hose.

- Refill the coolant system with the recommended type (usually a 50/50 mix of ethylene glycol and water for older GM vehicles).

5. **Monitor for Leaks Post-Installation** After starting the engine, check for coolant leaks around the new connector. If a leak occurs, tighten the clamps or reapply gasket maker as needed.

6. **Consider Professional Installation if Uncertain** If you re not comfortable working on the cooling system, a mechanic can install the part for a modest labor fee ( $50 $100), ensuring it s done correctly.

7. **Maintain the Cooling System** Regularly check coolant levels, top off as needed, and replace coolant every **5 years or 100,000 miles** (or as recommended in your owner s manual) to extend the life of all components.

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**Final Verdict:** The Dorman 01KW406 is a **good, budget-friendly replacement** for your GMC Sierra s coolant hose connector, provided you purchase it from a trusted source and perform the installation correctly. For maximum reliability, pair it with a full cooling system inspection to address any underlying issues.

Details:

Dorman parts are engineered to meet or exceed OEM standards, providing reliable performance, durability, and ease of installation. Manufacturer: Dorman. Item Specifics Clamps Included: Yes. Color: Silver.

Notes: Surge Tank to Engine. Warranty Coverage: 1 Year. End 1 Type: Hose Barb. End 1 Outside Diameter: 1.24 IN / 0.9.

Position: Outlet. End 1 Gender: Male. Part Type: Radiator Coolant Hose Connector. Reliable Performance: Engineered to meet or exceed OEM specifications for consistent operation and longevity.Durability: Manufactured using high-quality materials withstand the demands of everyday driving.Easy Installation: designed as direct-fit replacements, requiring minimal effort no special modifications.Wide Availability: Covers a broad range vehicle applications, making it easier find right part your car truck.

part #: 01kw406 price

• $39.66

specifications ocoosys:

• for models: 2500, Sierra
• for makes: Gmc
• for years: 1999-2004
• brand: Dorman
• mpn: 01kw406
• part type: Outlet Radiator Hose
• manufacturer warranty: 1 Year
• placement on vehicle: Outlet
• notes: Surge Tank To Engine
• description: Coolant Hose Junction
• short description: Coolant Junction
• package contents: 1 Heater Connector / 3 Clamps
• material: Carbon Steel
• color: Silver
• length: 3.48 In
• cs-sku: 328

shipping ocoosys:

• type: Fixed
• service: Standard
• cost: $0.00
• class: Standard
• transit: 4-10 Days

payments ocoosys:

• credit card: Mastercard
• wallet: Google-pay
• other

offer ocoosys:

• sold: 0
• quantity: 1
• options: Ship-to-home
• started: February 20, 2026
• availability: In Stock

general ocoosys:

• condition: New
• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

returns ocoosys:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

seller ocoosys:

• rating: 99.3%
• # reviews: 136
• city: Bronx, New York

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