Upper Coolant Pipe for 2011-2016 LML 6.6L Duramax Radiator Pipe | SPELAB
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---tab Description---
Upper Coolant Tube For 2011-2016 LML 6.6L Duramax Coolant Pipe Kit
The SPELAB Upper Coolant Tube is a premium upgrade designed to replace the factory plastic and rubber upper radiator hose on your 2011–2016 LML 6.6L Duramax. Built from high-grade 6061 aluminum with heavy-duty multi-ply silicone couplers, this system eliminates the failure-prone OEM parts and delivers long-lasting durability, clean aesthetics, and improved cooling reliability under heavy load or tuned conditions.
LML Upper Coolant Tube Key Features
• 6061-T6 Aluminum Construction
Mandrel-bent aluminum tubing resists heat, pressure, and aging far better than OEM rubber.
• CNC-Machined Thermostat Housing & Radiator Adapter
Ensures a perfect leak-free connection and long-term durability.
• Powder-Coated Finish (Multiple Colors Available)
Durable, corrosion-resistant coating adds a premium look to your engine bay.
• Direct Bolt-On Installation
No cutting or fabrication required — designed as a direct replacement for your factory upper coolant tube assembly.
Upper Coolant Tube Specification
Material
6061-T6 Aluminum Construction & Silicone
Weight
1.5 kg
Installation
Engine block or thermostat housing to the upper radiator section
What's in the BOX?
• 1 × Aluminum upper coolant tube
• 2 × Silicone couplers
• 4 × Stainless steel T-bolt clamps
---tab Fitment & FAQ---
This Upper Coolant Tube Fit:
• 2011-2016 LML 6.6L Duramax Diesel GMC Sierra 2500 HD
• 2011-2016 LML 6.6L Duramax Diesel GMC Sierra 3500 HD
• 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado 2500 HD
• 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado 3500 HD
FAQS
Why should I upgrade my 2011-2016 LML Duramax to an aluminum upper coolant tube?
The factory upper radiator hose on LML engines uses failure-prone plastic and rubber components. SPELAB's 6061-T6 aluminum tube eliminates these OEM weaknesses, providing superior durability and reliability under heavy load or tuned conditions.
Is this kit compatible with Silverado and Sierra 2500HD/3500HD trucks?
Yes, this kit is specifically engineered for 2011-2016 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L LML Duramax Diesel engine.
Does the SPELAB LML coolant pipe require any modifications for installation?
No, this is a direct bolt-on replacement. It utilizes CNC-machined thermostat housing and radiator adapters to ensure a perfect, leak-free fit without any cutting or fabrication required.
What are the benefits of the mandrel-bent aluminum construction?
Mandrel-bent aluminum tubing maintains a consistent diameter throughout bends, which reduces flow resistance and withstands heat and pressure far better than standard rubber hoses, helping to prevent major engine failures.
Can this modification help reduce engine operating temperatures?
Yes, by replacing the restrictive factory hose with high-grade aluminum tubing, this modification can help improve cooling efficiency and potentially reduce engine operating temperatures by approximately 20–25°F (11–14°C) under heavy use.
---tab Blog & Video---
Video about LML Upper Coolant Tube
Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!
Performance Upgrade Installation Guide
Quickly upgrade your cooling system
Performance Upgrade Installation Guide
OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures
Failure Prevention Installation Guide
×
---tab Shipping & Returns---
Fast Shipping Policy
Your order will be dispatched within 1-2 business days , and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 14-day free return , which means you don't have to pay for a return slip. Click for Return Policy
---tab Description---
Upper Coolant Tube For 2011-2016 LML 6.6L Duramax Coolant Pipe Kit
The SPELAB Upper Coolant Tube is a premium upgrade designed to replace the factory plastic and rubber upper radiator hose on your 2011–2016 LML 6.6L Duramax. Built from high-grade 6061 aluminum with heavy-duty multi-ply silicone couplers, this system eliminates the failure-prone OEM parts and delivers long-lasting durability, clean aesthetics, and improved cooling reliability under heavy load or tuned conditions.
LML Upper Coolant Tube Key Features
• 6061-T6 Aluminum Construction
Mandrel-bent aluminum tubing resists heat, pressure, and aging far better than OEM rubber.
• CNC-Machined Thermostat Housing & Radiator Adapter
Ensures a perfect leak-free connection and long-term durability.
• Powder-Coated Finish (Multiple Colors Available)
Durable, corrosion-resistant coating adds a premium look to your engine bay.
• Direct Bolt-On Installation
No cutting or fabrication required — designed as a direct replacement for your factory upper coolant tube assembly.
Upper Coolant Tube Specification
Material
6061-T6 Aluminum Construction & Silicone
Weight
1.5 kg
Installation
Engine block or thermostat housing to the upper radiator section
What's in the BOX?
• 1 × Aluminum upper coolant tube
• 2 × Silicone couplers
• 4 × Stainless steel T-bolt clamps
---tab Fitment & FAQ---
This Upper Coolant Tube Fit:
• 2011-2016 LML 6.6L Duramax Diesel GMC Sierra 2500 HD
• 2011-2016 LML 6.6L Duramax Diesel GMC Sierra 3500 HD
• 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado 2500 HD
• 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado 3500 HD
FAQS
Why should I upgrade my 2011-2016 LML Duramax to an aluminum upper coolant tube?
The factory upper radiator hose on LML engines uses failure-prone plastic and rubber components. SPELAB's 6061-T6 aluminum tube eliminates these OEM weaknesses, providing superior durability and reliability under heavy load or tuned conditions.
Is this kit compatible with Silverado and Sierra 2500HD/3500HD trucks?
Yes, this kit is specifically engineered for 2011-2016 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L LML Duramax Diesel engine.
Does the SPELAB LML coolant pipe require any modifications for installation?
No, this is a direct bolt-on replacement. It utilizes CNC-machined thermostat housing and radiator adapters to ensure a perfect, leak-free fit without any cutting or fabrication required.
What are the benefits of the mandrel-bent aluminum construction?
Mandrel-bent aluminum tubing maintains a consistent diameter throughout bends, which reduces flow resistance and withstands heat and pressure far better than standard rubber hoses, helping to prevent major engine failures.
Can this modification help reduce engine operating temperatures?
Yes, by replacing the restrictive factory hose with high-grade aluminum tubing, this modification can help improve cooling efficiency and potentially reduce engine operating temperatures by approximately 20–25°F (11–14°C) under heavy use.
---tab Blog & Video---
Video about LML Upper Coolant Tube
Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!
Performance Upgrade Installation Guide
Quickly upgrade your cooling system
Performance Upgrade Installation Guide
OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures
Failure Prevention Installation Guide
×
---tab Shipping & Returns---
Fast Shipping Policy
Your order will be dispatched within 1-2 business days , and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 14-day free return , which means you don't have to pay for a return slip. Click for Return Policy
SPELAB Auto Parts: 1 year from delivery; supplier conditions apply. SPELAB offers a one-year limited warranty from delivery for material/workmanship defects under normal use, original purchaser only, with proof of purchase. Consumables, wear/cosmetic damage, improper installation, alteration, misuse and removal/installation labor are excluded. Approved remedies are repair, replacement or replacement parts at SPELAB’s discretion.
Return and warranty information is based on what SPELAB Auto Parts offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
SPELAB Auto Parts warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what SPELAB Auto Parts offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
- Return eligibility
- SPELAB allows return requests within 30 days of delivery, with authorization and undamaged goods, original packaging and accessories. Tuners are final sale. Customer pays voluntary return shipping; original shipping is not refunded. SPELAB pays return shipping for approved damaged, incorrect or manufacturing-defective items. Transit damage must be reported within two business days and incorrect items within seven days. Based on what SPELAB Auto Parts offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- SPELAB Auto Parts
- Warranty duration
- 1 year from delivery; supplier conditions apply
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- SPELAB Auto Parts
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.