Coolant Tanks

Coolant Tanks: OEM-placement and degas tanks that hold pressure and bleed air

A coolant tank is the reservoir that manages the expansion, overflow and de-aeration of your cooling system. As the engine heats up, coolant expands and needs somewhere to go; as it cools, the tank feeds it back. Degas and expansion tanks also separate trapped air from the coolant so the system stays full and stable. When a factory plastic tank cracks, weeps at a seam, or you want something built to take pressure and heat cycling, an aftermarket coolant tank is the fix. That is the job these coolant tanks do, and this page covers the full range we stock in Engine Components.

What ThreePiece stocks

There are 55 coolant tanks in stock here from 10 brands. The biggest selection comes from Wehrli and Mishimoto, followed by Radium Engineering, with Weapon R, Perrin Performance, COBB, Torque Solution, Moroso, aFe and Fleece Performance filling out the rest. Current pricing runs from $58 to $567 for what is in stock now, not a fixed promise. Coverage spans model years 2001 through 2025, with fitment listed on 47 of the 55 parts. Top vehicles include the Subaru WRX and STI, Ford Focus and Mustang, Chevrolet Silverado, GMC Sierra, Toyota GR Corolla, Nissan 350Z, Lotus Elise and Exige, Honda Civic, Mitsubishi Evo, Dodge Hellcat, and the 6.7L Cummins and L5P Duramax diesel trucks.

How to choose

The split here is between OEM-placement diesel tanks and degas/expansion tanks for sport compacts. For late trucks, an OEM-placement kit like the Wehrli L5P Duramax tank kit or the Wehrli 6.7L Cummins tank kit mounts where the factory unit did and comes as a kit, which simplifies the install. The Mishimoto Ram 6.7L Cummins aluminum degas tank and the Mishimoto Powerstroke degas tank trade plastic for aluminum. The Fleece Performance Cummins replacement tank is a direct-replacement route. For a car, the aFe Challenger expansion tank is a bolt-in example. Match the part to your exact year and engine first, then decide between a full kit and a bare replacement tank.

What else you need

A coolant tank is one piece of the cooling system. If yours is tired, look at Radiators at the same time, and check the Fittings and Adapters you will need to plumb hoses cleanly. While the panel is off, many builders also refresh Head Gaskets and Gasket Kits.

Fitment help and ordering

Confirm year, make, model and engine before you order. If you are unsure, call fitment help at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout.

Coolant Tanks: OEM-placement and degas tanks that hold pressure and bleed air

A coolant tank is the reservoir that manages the expansion, overflow and de-aeration of your cooling system. As the engine heats up, coolant expands and needs somewhere to go; as it cools, the tank feeds it back. Degas and expansion tanks also separate trapped air from the coolant so the system stays full and stable. When a factory plastic tank cracks, weeps at a seam, or you want something built to take pressure and heat cycling, an aftermarket coolant tank is the fix. That is the job these coolant tanks do, and this page covers the full range we stock in Engine Components.

What ThreePiece stocks

There are 55 coolant tanks in stock here from 10 brands. The biggest selection comes from Wehrli and Mishimoto, followed by Radium Engineering, with Weapon R, Perrin Performance, COBB, Torque Solution, Moroso, aFe and Fleece Performance filling out the rest. Current pricing runs from $58 to $567 for what is in stock now, not a fixed promise. Coverage spans model years 2001 through 2025, with fitment listed on 47 of the 55 parts. Top vehicles include the Subaru WRX and STI, Ford Focus and Mustang, Chevrolet Silverado, GMC Sierra, Toyota GR Corolla, Nissan 350Z, Lotus Elise and Exige, Honda Civic, Mitsubishi Evo, Dodge Hellcat, and the 6.7L Cummins and L5P Duramax diesel trucks.

How to choose

The split here is between OEM-placement diesel tanks and degas/expansion tanks for sport compacts. For late trucks, an OEM-placement kit like the Wehrli L5P Duramax tank kit or the Wehrli 6.7L Cummins tank kit mounts where the factory unit did and comes as a kit, which simplifies the install. The Mishimoto Ram 6.7L Cummins aluminum degas tank and the Mishimoto Powerstroke degas tank trade plastic for aluminum. The Fleece Performance Cummins replacement tank is a direct-replacement route. For a car, the aFe Challenger expansion tank is a bolt-in example. Match the part to your exact year and engine first, then decide between a full kit and a bare replacement tank.

What else you need

A coolant tank is one piece of the cooling system. If yours is tired, look at Radiators at the same time, and check the Fittings and Adapters you will need to plumb hoses cleanly. While the panel is off, many builders also refresh Head Gaskets and Gasket Kits.

Fitment help and ordering

Confirm year, make, model and engine before you order. If you are unsure, call fitment help at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout.