HSP Diesel Upper Coolant Tube for 2017-2019 Chevrolet and GMC L5P Duramax
This product is vehicle-specific. Select your year, make, model, engine and transmission to confirm compatibility before adding it to your cart.
Colours and prices as published by HSP Diesel · verified 9/8/2026
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- Ships from HSP Diesel
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.
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.
HSP offers a limited lifetime warranty to the original purchaser on eligible HSP products. Underhood powder coating has separate two-year limited coverage. Non-HSP brands follow their own manufacturer warranties. Discontinued products and customer/installer damage are excluded. Claim authorization is required; customer pays inbound shipping for ordinary claims.
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
HSP Diesel warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
- Return eligibility
- HSP states returns must be postmarked within 30 days of purchase, new and unused with original tags and packaging, with an approved RMA. A 15% restocking fee and customer-paid return shipping apply. Special orders, non-HSP dropship products, apparel, used items and custom colors are excluded. Based on what HSP Diesel 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
- HSP Diesel
- Warranty duration
- Product-specific duration not stated; see supplier terms
- 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.