Keep a proper coolant reserve and an easy at-a-glance level check with the Dorman - OE Solutions Engine Coolant Reservoir 603-500. It drops in as a direct-fit replacement for the 1998-2002 Mazda 626, mounting in the front position where the original reservoir sits.
- Direct-fit design: a direct-fit replacement for the listed application, mounting in the front position.
- Coolant reserve: holds coolant and accommodates expansion as the system heats, returning it as the engine cools.
- Level monitoring: lets you check the coolant level during routine under-hood inspections.
Over years of heat cycling, the original reservoir can crack, warp, or leak at the seams and fittings, leading to coolant loss and low-level readings. If a cracked or leaking reservoir is the cause of your coolant loss, this replaces it and helps restore a sealed reserve for the cooling system. Inspect the cap, hoses, and clamps, and diagnose the source of any coolant loss before replacing.
Interchange: 2411117 · KL0115205 · KLG415350A · KLG415350B · KLG415350C · 41350C · SK603500 · FRT2103C. Manufacturer part number 603-500.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicle does the 603-500 reservoir fit?
It is a direct-fit replacement for the 1998-2002 Mazda 626. Check the Buyer's Guide tab to confirm it matches your vehicle.
What does an engine coolant reservoir do?
It holds coolant and accommodates expansion as the system heats, returning it as the engine cools, while letting you check the coolant level.
Where does this reservoir mount?
It mounts at the front of the engine bay, in the factory location for the listed 1998-2002 Mazda 626 application.
What are signs the reservoir may need replacing?
Cracks, warping, or leaks at the seams and fittings, along with coolant loss or persistently low level readings, are signs the reservoir may need replacing.
What interchange numbers does it cross-reference?
It replaces 2411117, KL0115205, KLG415350A, KLG415350B, KLG415350C, 41350C, SK603500, and FRT2103C. Its manufacturer part number is 603-500.
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