Dorman 603-5402 Washer Fluid Reservoir - Front

Washer Fluid Reservoir Replacement

Dorman 603-5402 is a replacement washer fluid reservoir built for underhood heat and engine vibration. It is a direct-fit style service part for specific vehicle applications, including Chevrolet Malibu and Pontiac G6 fitments where the original reservoir has cracked, leaked, or no longer holds washer fluid properly.

Key Features

• Plastic reservoir construction with a clear finish for fluid level visibility
• Engineered to match specific vehicle mounting and hose routing requirements
• Tested for fit and performance on targeted applications
• Reservoir cap included for a complete service replacement
• Part number 603-5402 for easy identification and ordering

Detailed Description

This Dorman washer fluid reservoir is made to replace the original windshield washer tank on select vehicles without changing the factory layout. The clear plastic body helps with visual fluid checks, while the reservoir design is intended to handle heat cycling and vibration in the engine compartment. For Chevrolet Malibu and Pontiac G6 owners, 603-5402 provides a practical replacement when the original tank is damaged, warped, or leaking. This part cross-references Monroe Shocks & Struts (e.g., 575.1022, N5355001) for the same application.

What It Helps Fix

• Washer fluid leaks from a cracked reservoir
• Low washer fluid capacity caused by a damaged tank
• Washer spray loss from a reservoir that no longer seals correctly
• Visibility issues from an empty or unreliable washer system
• Service failures related to heat- or vibration-damaged plastic

Installation Notes and Tips

Verify vehicle application before installation and compare the reservoir shape, cap location, and hose connections to the original part. Mounting hardware and mounting bracket are not included, so reuse the existing vehicle components when applicable. Inspect the washer pump, hoses, and grommets during replacement to help prevent repeat leaks. Part number 603-5402 should be matched to the vehicle’s original reservoir configuration for proper fit.

Quality Assurance

Dorman tests this reservoir for fit and performance on specific vehicle applications. The design is intended to meet the demands of underhood use, including heat exposure and engine vibration, while maintaining OE-style function for service replacement.