Expansion & Overflow Tank Pricing
Market data for 269,765 expansion and overflow tanks.
What you'll usually pay
👉 In short easy summary
Genuine OEM parts command the highest premium at 63% above the median. The best value is found in ACDelco parts, which sit 9% below the market median.
💚 Best value for your money
Price by brand
Why? Prices vary by manufacturer, with Ford at 59.69 and ACDelco at 34.66.
Price by type
Why? Coolant Overflow Reservoirs are more expensive (52) than Coolant Expansion Tanks (46.66).
Price by universal fitment
Why? Universal fitment parts carry a 31% premium over the median compared to non-universal parts.
🛒 Some on sale right now
Common questions
What is the median price for a new expansion tank?
The median price for new units is 39.42.
How do OEM tanks compare to the market average?
Genuine OEM tanks have a median price of 62.04, which is 63% above the market median.
Which brand offers the lowest median price?
ACDelco offers the lowest median price among listed brands at 34.66.
How we got these numbers
Worked out from 200 live eBay listings (price range $20–$140, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 12, 2026.