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The AISIN Coolant Expansion Tank is a replacement overflow tank for a vehicle's cooling system, made from high-strength engineering plastic that resists cracking and warping through repeated heat cycles. It has clear graduated markings for checking coolant level and an internal design meant to keep coolant flowing smoothly and cut air bubbles. It ships as the tank only, with no cap and no sensor, so those parts must be reused or bought separately. AISIN is an original-equipment supplier for several automakers, which is the main argument for it over unbranded tanks; the trade-off is that you pay for that name and still supply the cap and sensor yourself.
Availability unknown
Lowest price we've seen: $45.99 on Nov 1 at CarParts.com. Tracked across 1 store since Nov 1.
The AISIN Coolant Expansion Tank stores coolant and supports its circulation in the cooling system. It is molded from polypropylene, a high-strength engineering plastic that resists cracking and warping from repeated heat cycles.
The precision-molded design gives a tight seal to help prevent coolant loss over time. The materials resist corrosion from hot coolant and engine bay exposure. The internal design promotes smooth coolant flow and helps reduce air bubbles in the system.
Clear graduated markings on the tank let you check the coolant level at a glance.
