Keep your cooling system topped off and easy to monitor with the Dorman - OE Solutions Engine Coolant Reservoir 603-066. This front-mounted reservoir drops in as a direct-fit replacement for the 2004-2006 Chevrolet Malibu and 2005-2006 Pontiac G6, giving the expanding coolant somewhere to go as the engine heats up and returning it to the system as things cool down.
- Coolant storage & overflow: Holds the cooling system's expansion volume and lets you check the fluid level at a glance.
- Front-mounted design: Positioned at the front of the engine bay for the listed applications.
- Direct-fit replacement: Made to install in place of a cracked, brittle, or leaking factory reservoir.
Signs the original reservoir may need replacing include visible cracks, coolant seepage around the tank, a persistently low coolant level, or a warped or discolored bottle. If a failed reservoir is the source of your coolant loss, this replaces it. Always diagnose the underlying cause of any coolant loss before replacing parts.
Interchange: 15066786 · 15793368 · 2411009 · DAKG-15310 · DAKG15310 · GM3014140 · FRT1214C
Manufacturer part number 603-066
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the Dorman 603-066 coolant reservoir fit?
It is a direct-fit replacement for the 2004-2006 Chevrolet Malibu and the 2005-2006 Pontiac G6. Check the Buyer's Guide tab to confirm fitment for your vehicle.
What does an engine coolant reservoir do?
It stores the cooling system's expansion volume, giving heated coolant a place to expand into and drawing it back as the engine cools, while letting you check the coolant level.
How do I know if my coolant reservoir needs replacing?
Common signs include visible cracks, coolant seepage around the tank, a persistently low coolant level, or a warped or discolored bottle. Diagnose the cause of any coolant loss first.
What interchange numbers does part 603-066 replace?
It cross-references 15066786, 15793368, 2411009, DAKG-15310, GM3014140, and FRT1214C.
Where is this reservoir mounted?
For the listed applications it is a front-mounted reservoir, installing in place of the original factory unit.
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