Keep your cooling system holding pressure and coolant where it belongs with the Dorman - OE Solutions Engine Coolant Reservoir 603-840. It drops in as a direct-fit replacement for the 2014-2021 RAM 2500, 2014-2021 RAM 3500, 2014-2021 RAM 4500 and 2014-2021 RAM 5500, plus the 2019-2021 RAM 4000, all with the V8-6.4L engine. Dorman engineers this reservoir to match the original part's fit and function, so it installs cleanly in place of the factory unit.
- Durable construction: molded from plastic to withstand underhood heat and engine vibration.
- Pressurized design: includes a twist-type cap rated to a maximum of 20 PSI.
- Mounting brackets included: mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused.
- Capacity: holds 2.5 liters; a coolant level sensor is not included.
Signs this reservoir may need replacing include cracks, coolant weeping or seepage, and a persistently low coolant level. Country of origin: Taiwan.
Interchange: 68096261AA · 68184910AC · 68184910AD · 68184910AE · 68184910AF · 68249136AA · 68442532AA · 2411293 · CH3014187 · CH3014188. Manufacturer part number 603-840.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Does this coolant reservoir come with a cap?
Yes. It includes a twist-type cap rated to a maximum of 20 PSI.
Does it include a coolant level sensor?
No. A level sensor is not included with this reservoir.
Are mounting brackets and hardware included?
Mounting brackets are included, but mounting hardware is not. Consult the vehicle service information for the correct fasteners and whether they may be reused.
What vehicles does part 603-840 fit?
It fits the 2014-2021 RAM 2500, 3500, 4500 and 5500, and the 2019-2021 RAM 4000, all with the V8-6.4L engine. See the Buyer's Guide tab to confirm your vehicle.
What are signs this reservoir may need replacing?
Common signs include cracks in the tank, coolant weeping or seepage, and a coolant level that keeps dropping. Diagnose the cause before replacing.
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