Dorman 603-5503 front windshield washer fluid reservoir for the 1991-2003 Mack MR holds the washer fluid that feeds the windshield sprayers. This Dorman washer fluid reservoir is a heavy-duty replacement for an original that has cracked or been damaged by heat.
- Heavy-duty plastic body for the washer fluid supply
- Engineered to withstand underhood heat and engine vibration
- Designed to help keep washer fluid storage leak-free when an original reservoir has cracked or failed from heat and vibration
- Reservoir cap included
Quick facts
- Part: Dorman 603-5503 windshield washer fluid reservoir
- Fits: 1991-2003 Mack MR
- Position: Front
- Material: Plastic
- Condition: New
A cracked plastic body, fluid stains under the hood or a washer fluid level that keeps dropping can mean the reservoir has failed. Before replacing it, look over the plastic, its seams and the hose connections with the engine off and cool, in case the leak is somewhere else. This listing is one reservoir, and the 1991-2003 Mack MR takes one.
Fits
It is designed as a direct replacement for the original equipment reservoir on the 1991-2003 Mack MR.
Specifications
Fit and size
- Position: Front
- Quantity per vehicle: 1
Build and materials
- Material: Plastic
- Condition: New
- Reservoir cap: included
- Mounting hardware: not included
- Mounting bracket: not included
- Country of origin: Taiwan
In the box
One windshield washer fluid reservoir with its cap. Mounting hardware and a mounting bracket are not included, so plan on new fasteners, since the old ones may not be reusable.
Interchange: 575.1051
25128217 · 34QT411M · 34QT412M
This part cross-references / interchanges with the following part numbers:
575.1051, 25128217, 34QT411M, 34QT412M
Frequently Asked Questions
Will this Dorman 603-5503 front washer fluid reservoir fit the 1991-2003 Mack MR?
Yes. Dorman 603-5503 is a front windshield washer fluid reservoir listed for the 1991-2003 Mack MR, and that truck takes one.
Is the Dorman washer fluid cap included with this reservoir?
Yes, the reservoir comes with its cap. The mounting hardware and the mounting bracket are not included.
What is this Dorman washer reservoir made of?
Dorman 603-5503 is made of plastic and is sold as a single heavy-duty windshield washer fluid reservoir.
How can I tell if my washer fluid reservoir is cracked?
With the engine off and cool, look for visible cracks, fluid stains or drips on the plastic, and watch for the fluid level dropping between fills. Any of these can mean the reservoir has failed.
Is this reservoir built to handle underhood heat and vibration?
Yes. This reservoir is engineered to withstand underhood heat and engine vibration, and to help keep washer fluid storage leak-free where an original has cracked or failed.
