Shop / Maintenance & Replacement / HSP Diesel Upper Coolant Tube for 2017-2019 Chevrolet and GMC L5P Duramax
HSP Diesel
HSP Diesel Upper Coolant Tube for 2017-2019 Chevrolet and GMC L5P Duramax
MPN: 637-1-HSP
HSP Diesel L5P 2017-2019 Upper Coolant Tube Part Number: 637-1-HSP The 637-1-HSP is best known as the HSP Upper Coolant Tube for the 2017-2019 L5P Duramax-equipped Chevrolet and GMC trucks. This is an often-overlooked component that can truly elevate the look of your engine bay. Why Would You Nee…
$150
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Fitment sensitive
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Colours and prices as published by HSP Diesel · verified 9/8/2026
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Warranty
Warranty Information Pending
Warranty information has not yet been provided for this product. Contact FullSpecDiesel for help locating the applicable manufacturer or supplier warranty.
View complete warrantyHSP Diesel L5P 2017-2019 Upper Coolant Tube Part Number: 637-1-HSP The 637-1-HSP is best known as the HSP Upper Coolant Tube for the 2017-2019 L5P Duramax-equipped Chevrolet and GMC trucks. This is an often-overlooked component that can truly elevate the look of your engine bay. Why Would You Need the HSP Upper Coolant Tube? The factory upper coolant tube is functional but lacks durability and aesthetic appeal. It can crack over time due to its construction, and it simply doesnt match the performance and visual standards of the L5P platform. What Makes the HSP Upper Coolant Tube Different? The HSP Upper Coolant Tube is precision-built from aluminum to prevent failures and add durability. The aluminum construction allows for powder coating in a range of colors and is topped with the HSP Diesel logo for a custom look. Slight precision bends ensure a perfect drop-in fit with factory components—no modifications required. Installation is quick and easy with basic tools and knowledge. Whats Included: 1x Radiator Hose Tube w/ Logo (HSP-IN-248) 4x 2" T-Bolt Clamp (RFB-370-RFAB) 2x 2"x4" Straight Boot (RFB-691-RFAB) Special Note: This part fits only 2017-2019 L5P models. Although the VIN code (Y) is shared with later models, changes in the engine bay layout make it incompatible with 2020+ trucks. Please verify the model year before ordering. Vehicle Fitment: L5P: 2017-2019 (8th digit of VIN = Y) How to Verify: The 8th character of the VIN indicates the engine code. The 10th character shows the model year. Overview: Maintains factory routing 2" outer diameter matches factory hose size No modifications necessary Enhances engine bay appearance Durable aluminum construction Our Warranty HSP “No BS” Limited Lifetime Warranty We believe in our products and back every one with our No BS Warranty. For complete terms, coverage details, and how to submit a claim, click here.
HSP Diesel L5P 2017-2019 Upper Coolant Tube Part Number: 637-1-HSP The 637-1-HSP is best known as the HSP Upper Coolant Tube for the 2017-2019 L5P Duramax-equipped Chevrolet and GMC trucks. This is an often-overlooked component that can truly elevate the look of your engine bay. Why Would You Need the HSP Upper Coolant Tube? The factory upper coolant tube is functional but lacks durability and aesthetic appeal. It can crack over time due to its construction, and it simply doesnt match the performance and visual standards of the L5P platform. What Makes the HSP Upper Coolant Tube Different? The HSP Upper Coolant Tube is precision-built from aluminum to prevent failures and add durability. The aluminum construction allows for powder coating in a range of colors and is topped with the HSP Diesel logo for a custom look. Slight precision bends ensure a perfect drop-in fit with factory components—no modifications required. Installation is quick and easy with basic tools and knowledge. Whats Included: 1x Radiator Hose Tube w/ Logo (HSP-IN-248) 4x 2" T-Bolt Clamp (RFB-370-RFAB) 2x 2"x4" Straight Boot (RFB-691-RFAB) Special Note: This part fits only 2017-2019 L5P models. Although the VIN code (Y) is shared with later models, changes in the engine bay layout make it incompatible with 2020+ trucks. Please verify the model year before ordering. Vehicle Fitment: L5P: 2017-2019 (8th digit of VIN = Y) How to Verify: The 8th character of the VIN indicates the engine code. The 10th character shows the model year. Overview: Maintains factory routing 2" outer diameter matches factory hose size No modifications necessary Enhances engine bay appearance Durable aluminum construction Our Warranty HSP “No BS” Limited Lifetime Warranty We believe in our products and back every one with our No BS Warranty. For complete terms, coverage details, and how to submit a claim, click here.
Product conditions
- Return eligibility
- Returnable within 30 days of confirmed delivery, in original condition, with an approved RMA
- Return window
- 30 days from confirmed delivery
- Restocking fee
- No restocking fee
- Return shipping
- Customer pays return shipping on voluntary returns
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Cancellation is only possible before the supplier order is submitted
- Warranty provider
- Warranty Information Pending
- Warranty duration
- Pending verification
- 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
- HSP Diesel
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.