Coolant Reservoir, Coolant Bottle, and Radiator Overflow Tank Replacements for Cars and Trucks

A coolant reservoir absorbs pressure changes as your cooling system heats and cools, giving expanding coolant somewhere to go rather than forcing it out through a weak seam elsewhere. CBT Auto Parts stocks coolant reservoir and coolant bottle options for cars, trucks, and SUVs.

Every radiator overflow tank here is OEM grade or built to OEM specification, so mounting brackets and cap thread match the original. Confirm fitment by year, make, and model, then add a radiator cap or radiator hose from the wider Cooling, HVAC and Climate Control Parts range. Orders ship fast worldwide, with support on hand if you're unsure which reservoir fits.

Coolant Reservoirs

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FAQs

1. How do I know if my coolant reservoir needs replacing?

Steady coolant loss with no visible puddle, cracking, chalky plastic, or weeping around a seam line is the clearest sign.

2. Why does my coolant reservoir tank look faded or chalky?

UV exposure and heat cycling embrittle the plastic over time, which can lead to cracking even without any visible damage beforehand.

3. What's a normal coolant color in the reservoir?

It should stay close to its original shade, green, orange, pink, or blue, depending on formulation; a brown or rusty tint suggests corrosion.

4. Is the coolant reservoir itself pressurized?

Usually not, most vehicles pressurize at the radiator cap and the reservoir just collects overflow, though some designs reverse this, so it's worth confirming for your vehicle.

5. Can I use a custom or universal coolant reservoir on my build?

Yes, custom reservoirs with universal brackets work well for engine swaps or restorations where the original mounting location no longer exists.