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Dorman

Dorman 603-668 Non-Pressurized Coolant Reservoir with Cap Compatible with Select Buick / Chevrolet / Pontiac Models

  • Based on 247 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Oct 4
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Features

  • Direct replacement - this engine coolant reservoir matches the fit and function of the original part
  • Ideal solution - engineered for a seamless installation
  • Durable construction - manufactured from quality materials to withstand underhood heat and vibration
  • Trustworthy design - backed by 100 years of automotive aftermarket experience
  • Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

Description

This replacement engine coolant reservoir is manufactured from quality materials to withstand the stresses of underhood heat and engine vibration. It is engineered and manufactured to match the fit and function of the original part. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Buick Allure: 2005, 2006, 2007, 2008, 2009] - [Buick LaCrosse: 2005, 2006, 2007, 2008, 2009] - [Chevrolet Impala: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011] - [Chevrolet Monte Carlo: 2004, 2005, 2006, 2007] - [Pontiac Grand Prix: 2004, 2005, 2006, 2007, 2008]

Brand: Dorman


Material: Stainless Steel


Item dimensions L x W x H: 13.64 x 12.85 x 4.74 inches


Exterior Finish: Machined


Vehicle Service Type: Car


Brand Name: Dorman


Manufacturer Part Number: 603-668


OEM Equivalent Part Number: 10322539; 20917050


Global Trade Identification Number: 66


UPC: 885484606166


Manufacturer: Dorman Products


Number of Items: 1


Included Components: 1 Coolant Reservoir, 1 Cap


Item Type Name: Dorman 603-668 Non-Pressurized Coolant Reservoir


Model Number: 603-668


Unit Count: 1 Count


Manufacturer Warranty Description: Limited Lifetime Warranty


Compatible with Vehicle Type: Car


Fuel Type: Gasoline


Product Grade: Replacement Part


Fit Type: Vehicle Specific


Automotive Fit Type: Vehicle Specific Fit


Item Dimensions: 13.64 x 12.85 x 4.74 inches


Material Type: Stainless Steel


Exterior Finish: Machined


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Oct 4

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • It fits
Perfect 👍
Reviewed in the United States on September 7, 2026 by James Marshall
    • Nice replacement
Got this for my wife 2008 Buick lacrosse and it fit perfectly. Easy to install and hook up. There is no leakage and it is very sturdy. Great value for the price.
Reviewed in the United States on April 27, 2026 by Jimmie walker
    • Reservoir
This product was better quality than the original manufacturer part. Worked perfectly with no issues or complaints took all of 5 minutes to install.
Reviewed in the United States on August 2, 2025 by Kevin Hernandez
    • Cooling tank
This was the best fits perfectly thank you
Reviewed in the United States on July 17, 2026 by Donna Patterson
    • Easy install
Fitgrade, the value was great. The quality was good.And in the appearance looked really good with a nice new jug
Reviewed in the United States on April 4, 2026 by Chris Levan
    • Fits well and works well
It's just like the original one. the only issue is the nozzle is built lower into the bottle which makes it bump into the wiring harness. It made it slightly harder to install but not a big issue
Reviewed in the United States on October 9, 2023 by Simple Man
    • Much better than the OEM...
Did not have a problem with the original overflow tank on my Grand Prix until recently, when for some reason the alternator pulley started to engage the tank and dug a hole the size of a quarter into it. This Dorman replacement part solves that problem in a big way! The tank is completely redesigned and is nowhere near the alternator pulley. I see some complaining that the fill line is higher than on the original one, but it's actually easier to see because it's higher up, and very little chance that the alternator pulley will become a problem. Great job Dorman!! ... show more
Reviewed in the United States on April 2, 2022 by Kenny
    • Quick shipping
Item fit correctly.
Reviewed in the United States on March 17, 2026 by Randy Drake

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