Coolant Reservoir Tank

Aluminum Coolant Reservoir Tanks for Powerstroke, Cummins & Duramax

This collection focuses on aluminum coolant reservoir tanks for Ford Powerstroke, Ram Cummins, and GM Duramax diesel trucks. These tanks are built for truck owners replacing an aging plastic coolant reservoir, cracked Powerstroke degas bottle, or leaking coolant overflow tank with a stronger aluminum upgrade.

Start by matching your truck’s make, model year, engine platform, cap style, sensor setup, and hose routing before ordering. A coolant reservoir that fits a 6.0L Powerstroke will not fit a 6.7L Powerstroke, and a Duramax LML tank is not the same as an LMM or LB7 / LLY / LBZ tank.

Choose by Diesel Platform

The easiest way to choose the right coolant tank is to start with your truck platform. Powerstroke, Cummins, and Duramax owners often use different search terms, but the buying logic is the same: confirm the year, engine, mounting points, hose layout, cap style, and sensor compatibility.

Big 3 Diesel Truck Fitment Guide

Use this fitment guide as a starting point, then open the product page to confirm exact compatibility before checkout. After you find your platform in the table, compare the product photos, hose locations, mounting points, cap style, and sensor setup with your factory tank before placing the order.

Why Upgrade to an Aluminum Coolant Reservoir Tank?

Factory plastic coolant reservoirs, overflow tanks, and Powerstroke degas bottles live through years of heat cycles, cooling-system pressure, vibration, and age. Over time, the molded seams, hose necks, cap area, and mounting points can become weak spots, especially on diesel trucks that tow, idle hard, or work in hot weather.

Many SPELAB aluminum coolant reservoirs use TIG-welded 6061 aluminum construction and pressure-tested welding for a stronger replacement over aging factory plastic tanks. Depending on the application, selected tanks may also include a sight glass window, external level tube, billet cap option, or internal baffling. Always check the specific product page for exact features before ordering.

• Seam splitting: Aging plastic tanks often fail around molded seams, hose necks, or stress-heavy mounting points.
• Coolant loss under load: A small crack may only open when the truck builds heat and pressure during towing or long highway driving.
• White crusty residue: Dried coolant around the cap, hose connections, or tank body can point to a pressure-side leak.
• Powerstroke degas bottle issues: Ford diesel owners often call this part a degas bottle, especially on 6.0L, 6.4L, and 6.7L Super Duty trucks.
• Cooling-system limits: A stronger aluminum tank can replace a weak plastic reservoir, but it will not fix a bad radiator, thermostat, water pump, fan clutch, weak pressure cap, head gasket problem, or trapped air in the system.

Coolant Reservoir vs Overflow Tank vs Degas Bottle

Truck owners use several names for this part. “Coolant reservoir” and “coolant overflow tank” are common general terms. Ford Powerstroke owners often say “degas bottle,” especially when talking about 6.0L, 6.4L, and 6.7L Super Duty trucks. GM Duramax and Ram Cummins owners usually search by coolant reservoir, coolant tank, or overflow tank.

The exact function and pressure design can vary by vehicle, so do not order by name alone. Always match the tank to the truck’s year, engine, sensor, cap, and hose routing.

What to Check Before Ordering

Most wrong orders happen because the buyer matches only the engine family and misses the details. Before adding a coolant reservoir to your cart, confirm these points.

• Model year: Split-year platforms can use different parts.
• Engine platform: Powerstroke, Cummins, and Duramax tanks are not universal.
• Sensor compatibility: If your truck uses a factory coolant level sensor, confirm the product supports it.
• Cap style: Some tanks reuse the OEM-style pressure cap, while others may use a different cap setup.
• Hose routing: Compare hose neck locations before ordering, especially on trucks with previous modifications.
• Mounting points: Confirm the tank is designed for factory mounting locations.
• Cooling-system condition: A new tank will not fix a bad hose, weak cap, stuck thermostat, clogged radiator, or air trapped in the system.

Installation Notes

Most coolant reservoir replacements are straightforward for experienced DIY owners, but the cooling system must be handled carefully. Always let the engine cool completely before opening the cap or disconnecting coolant hoses.

1. Let the engine cool fully before starting the job.
2. Remove the factory plastic reservoir and disconnect the hoses carefully.
3. Install the aluminum tank using the correct mounting points.
4. Reconnect hoses and refill with the correct coolant for your truck.
5. Bleed air from the cooling system according to the vehicle’s service procedure.
6. Recheck coolant level, hose clamps, and cap seal after the first heat cycle.

Selected Performance Car Applications

Although this collection is built around Big 3 diesel truck applications first, SPELAB also offers selected aluminum coolant overflow tanks for performance cars. These applications include platforms such as Ford Mustang, Chevrolet Camaro, Dodge Charger / Challenger, Chrysler 300C, Honda Civic Type R, Subaru WRX / STI, Subaru BRZ, Toyota 86, and Scion FR-S.

For performance cars, the buying checks are similar: confirm model year, engine, mounting points, hose routing, cap style, and whether the tank is designed for your exact chassis.

Related Cooling System Parts

If you are refreshing more than the coolant reservoir, you may also want to inspect related cooling-system parts such as the radiator, coolant tube, and coolant filtration system. A stronger aluminum tank is only one part of a healthy cooling system.