2015-2015 Duramax LML HSP Factory Replacement Coolant Tank (527-2-HSP)
The HSP Factory Replacement Coolant Tank is a critical upgrade for 2015-2016 LML Duramax-equipped Chevrolet and GMC trucks. This component replaces the failure-prone factory unit with a stronger, better-looking solution designed for long-term durability and performance.
Why Upgrade to the HSP Coolant Tank?
The OEM coolant tank is constructed from plastic, which becomes brittle over time due to heat cycles. This brittleness leads to cracks, leaks, and ultimately coolant system failure. Additionally, the plastic discolors and yellows, making your engine bay look aged and poorly maintained.
What Makes the HSP Coolant Tank Different?
The HSP Coolant Tank is CNC-cut and bent from high-quality aluminum, eliminating the risk of cracking. Its a direct drop-in replacement, meaning it fits the OEM location and works seamlessly with factory provisions and fittings — including the factory low coolant level sensor. With the aluminum construction, you also gain the option to powder coat for a clean, custom appearance under the hood.
This coolant tank is designed specifically for 2015-2016 models due to slight engine bay variations. Confirm fitment using the 8th character (engine code) and 10th character (model year) of your VIN.
- 1x LML (15-16) Factory Replacement Tank (HSP-IN-708-16)
- 1x Radiator Cap (RFB-806-RFAB)
- 14x 1/2" Heater Hose (RFB-400-RFAB)
- 3x 1/2" Worm Gear Clamp (RFB-405-RFAB)
- 1x 1" Worm Gear Clamp (RFB-406-RFAB)
- 1x Low Coolant Sensor (RFB-460-RFAB)
- 1x 3/8" Coolant Plug - Aluminum (RFB-808-RFAB)
LML: 2015-2016 (VIN Code 8)
Please note that actual products may differ from images shown on our website. While we strive for accuracy in product listings, manufacturers may make changes to design, contents, color, or packaging without notice. Product images are for illustrative purposes only and may not represent the exact item you receive.
By purchasing, you acknowledge and accept that variations may occur and release OCDiesel from any liability related to product appearance differences.
Order Processing Time:
Orders are typically processed within 24-48 hours after the order has been placed.
Custom or special order items may take longer to process, typically 3-5 business days depending on the product and customization required.
Shipping Methods:
Standard Shipping (3-7 business days - location dependent)
Express Shipping (1-2 business days- location dependent)
Packaging:
All parts are securely packaged to better prevent any damage during transit. Fragile or high-value parts will be packaged with additional protective materials, such as bubble wrap or foam padding.
Shipping Rates:
Shipping rates vary based on the size, weight, and destination of the package. You can view the estimated shipping costs for your order during the checkout process before placing your order.
Order Tracking:
Once your order has been shipped, you will receive an email with the tracking number and carrier information. You can also track your order status by logging into your OCDiesel account.
USA Shipping:
We ship to the USA! (Except California) Please note that USA shipping rates and delivery times may vary based on destination. Customers are responsible for any customs fees, import taxes, or additional charges that may apply.
Not all products are stocked in-house. To ensure you receive your desired items promptly, please check for availability before placing your order. Some products may be backordered due to high demand or supply chain constraints, which could result in longer delivery times.
We strive to keep our inventory updated regularly, but availability can change quickly. For the most accurate information, contact the OCDiesel customer service team using either this link, or the chat bubble on the bottom right of this page.
Most items are eligible for return within 30 days of shipping, provided they are unused, in original manufacturer packaging, and in resalable condition. All returns & cancellations are subject to restocking and cancellation fees.
Returns must include a Return Authorization Number (RA #) and be shipped with tracking. Return shipping costs are the responsibility of the customer.
Custom/special orders, electronics, and digital goods are final sale—no returns, refunds, or exchanges.
For full return instructions, fee details, and conditions, click here.
