HSP Diesel Upper Coolant Tube for 2011-2014 Chevrolet and GMC LML Duramax

2011-2014 Chevrolet / GMC Upper Coolant Tube

Part Number: 537-1-HSP

The HSP Upper Coolant Tube is a premium upgrade for 2011-2014 LML Duramax-equipped Chevrolet and GMC trucks. This often-overlooked component improves durability and brings a cleaner, more custom look to your engine bay.

Why Upgrade the Upper Coolant Tube?

The OEM upper coolant tube is made of rubber — a material that can crack over time, especially under high heat and pressure. This leads to cooling system failure and a cluttered engine bay appearance. The HSP Upper Coolant Tube resolves both of those issues in one upgrade.

What Sets the HSP Tube Apart?

Crafted from aluminum, the HSP Upper Coolant Tube offers superior strength, eliminates rubber cracking risks, and delivers better aesthetics. Designed with gentle bends to match factory routing, this powder-coated tube includes the signature HSP Diesel logo front and center. It's a direct-fit replacement with upgraded components that improve both flow and reliability.

Whats Included:

• 1x LML (11-14) Radiator Hose Tube w/Logo (HSP-IN-239-1)
• 1x 1 3/4" Worm Gear Clamp (RFB-408-RFAB)
• 1x 1.75" 90degree Boot - Rubber (RFB-433-RFAB)
• 1x 1.75"x3" Straight Boot - Rubber (RFB-437-RFAB)

Fitment:

• LML: 2011-2014 (VIN Code 8)

How to Check VIN Code: The 8th character of the VIN indicates engine code. The 10th character shows the model year.

Overview

• Aluminum construction for increased durability
• Includes high-strength silicone boots
• Eliminates risk of cracking rubber hoses
• Powder coat options available
• Drop-in fit with factory components

Note: HSP is currently transitioning boot styles. Some units may ship with unbranded boots to maintain part availability and quality standards.

Our Warranty

HSP "NO BS" LIMITED LIFETIME WARRANTY

At HSP, we believe in our products and stand behind every one that leaves our facility. For years, we've supported customers without a formal policy — now, with our official No BS Warranty, you can count on reliable, long-term coverage. This is our promise to go above and beyond, with straightforward support and no runaround.

Click here to read the full HSP Warranty