HSP Diesel Upper Coolant Tube for 2015-2016 Chevrolet and GMC LML Duramax

2015-2016 Chevrolet / GMC Upper Coolant Tube

Part Number: 537-2-HSP

The HSP Upper Coolant Tube is a premium upgrade for the 2015-2016 LML Duramax-equipped Chevrolet and GMC trucks. This often-overlooked component is both functional and aesthetic — a simple replacement that adds durability and style to your engine bay.

Why Upgrade to the HSP Upper Coolant Tube?

The factory rubber upper coolant hose is prone to cracking, leaking, and early failure — especially in high-heat conditions. It's also an eyesore that clashes with an otherwise clean engine bay. The HSP Upper Coolant Tube eliminates those weak points while giving your truck a sharp, finished look.

What Makes the HSP Upper Coolant Tube Different?

HSPs version is crafted from durable aluminum to eliminate the cracking issues found in OEM rubber hoses. Designed with gentle mandrel bends and finished in your choice of powder coat colors, this drop-in replacement maintains factory fitment while improving reliability and appearance. The engraved HSP Diesel logo adds a bold detail front-and-center in the engine bay.

Whats Included:

• 1x LML (15-16) Radiator Hose Tube w/Logo (HSP-IN-239-2)
• 4x 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: 2015-2016 (VIN Code 8)

Important Fitment Note: This only fits 2015-2016 model year LML trucks. While VIN codes may appear the same across years, there are engine bay differences. Double-check your vehicles year before purchasing.

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

Overview

• Aluminum construction for increased reliability
• High-strength silicone boots included
• Eliminates rubber cracking issues
• Powder coat options available
• Drop-in replacement with factory fitment

Note: HSP is currently making a running change to boot styles. You may receive boots without logos — this ensures continued delivery of the high-quality parts you expect.

Our Warranty

HSP "NO BS" LIMITED LIFETIME WARRANTY

At HSP, we believe in our products and stand firmly behind everything we make. For years, we've gone above and beyond to support our customers — even without a formal warranty. Now, with the No BS Warranty, we've made our commitment official. You can trust that you're covered with a lifetime guarantee that actually means something.

Click here to read the HSP Warranty