Freightliner Cascadia Coolant Reservoir / Overflow Tank 12.8L (2018–2022) – 603-1316, Replaces A0532836000
Warranty Information
ROADWEST stands behind the parts we sell. Unless otherwise stated on the product page, your purchase is covered by a 1-Year Limited Warranty against manufacturing defects under normal use.
What’s covered
- Defects in materials or workmanship
- Premature failure caused by factory-related issues
What’s not covered
- Normal wear and tear, cosmetic aging, corrosion from environment/road salt
- Damage from improper installation, incorrect wiring, modifications, misuse, or accidents
- Labor costs (installation/removal), downtime, towing, or other indirect costs
How to file a claim
Contact us with:
- Order number
- Product name / SKU
- Clear photos or a short video showing the issue
If approved, ROADWEST will provide an appropriate resolution (replacement parts, replacement unit, or refund/credit).
Please do not send items back without return authorization.
For more details, see our Shipping Policy, Easy Return & Refund Policy, and Warranty pages.
Shipping & Returns
Most ROADWEST orders ship from our U.S. warehouses within 1–2 business days. Standard ground delivery in the contiguous United States is typically 1–3 business days, with freight service used for oversized or extra-heavy parts.
- Shipping area: United States only (no PO Boxes or international addresses).
- Processing time: In-stock items usually ship within 1–2 business days, Mon–Fri.
- Delivery: Standard ground or LTL freight depending on size and weight.
- Returns: Most unused items may be returned within 30 days of delivery, subject to inspection and our return guidelines.
- Costs: Original and return shipping are generally the customer’s responsibility, unless the issue is caused by ROADWEST (wrong item, damaged on arrival, etc.).
For full details, please review our Shipping Policy and Easy Return & Refund Policy before placing your order.
Keep your late-model Cascadia running at the right temperature with the High Soar 603-1316 Engine Coolant Reservoir Tank. Designed as a direct replacement for the factory tank on 2018–2022 Freightliner Cascadia trucks, this heavy duty coolant overflow reservoir restores proper coolant storage and circulation in demanding commercial use.
Built with a generous 12.8 L capacity and a 20 PSI cap maximum pressure rating, this tank is engineered to handle long hours on the road, high underhood temperatures and continuous vibration. The OE-style design matches the original mounting points and dimensions, making installation clean and straightforward for fleet shops and owner-operators.
Whether you’re replacing a cracked, leaking or discolored reservoir, this unit helps maintain correct coolant levels and flow, so the engine can reach and hold its optimal working temperature more quickly and reliably.
- Direct replacement for Cascadia – High Soar 603-1316 engine coolant reservoir tank is designed to fit 2018, 2019, 2020, 2021, 2022 Freightliner Cascadia models.
- OE cross reference – Replaces OEM coolant overflow tank OE# A0532836000 for a factory-style fit and function.
- Heavy duty capacity – Features a 12.8 L capacity and 20 PSI cap maximum pressure rating to support modern HD cooling system requirements.
- Application-specific dimensions – Approximate dimensions: Height: 880 mm, Length: 307 mm, with mounting holes threaded M6-1.0 for correct installation.
- Engineered for reliability – Quality construction resists heat and vibration, helping prevent leaks and premature failure compared to worn or damaged original tanks.
- Restores cooling performance – Helps control coolant flow so the engine reaches operating temperature quickly and stays within a safe range under load.
- Ready-to-install kit – Supplied as a heavy duty reservoir tank with 2 caps, simplifying replacement and reducing downtime.
- Fitment note – Always confirm your truck’s year, model and OE number before ordering to ensure this premium radiator coolant overflow tank is the correct application.
Package Includes:
- 1 × Heavy Duty Engine Coolant Reservoir Tank (603-1316 style)
- 2 × Coolant Reservoir Caps
| Brand | High Soar |
|---|---|
| Product Type | Engine Coolant Reservoir / Overflow Expansion Tank |
| OE Cross Reference | A0532836000 |
| Compatible Vehicles | Freightliner Cascadia 2018, 2019, 2020, 2021, 2022 |
| Capacity | 12.8 L |
| Cap Pressure Rating | 20 PSI (maximum) |
| Approx. Dimensions | Height: 880 mm; Length: 307 mm |
| Mounting Hole Spec | M6-1.0 threaded mounting holes |
| Material | Heavy duty coolant-resistant construction |
| Vehicle Service Type | Heavy Duty Truck / Semi Truck |
| Fit Type | Vehicle Specific – Freightliner Cascadia (2018–2022) |
| Function | Stores and balances coolant, supports proper flow so the engine reaches and maintains working temperature quickly |
| Installation | Direct bolt-in replacement; professional installation recommended for fleet use |