Dorman 603-158 Washer Fluid Reservoir - Front

Overview of Dorman 603-158 Washer Fluid Reservoir

The Dorman 603-158 washer fluid reservoir is designed to restore proper windshield washer function for select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab vehicles. This replacement reservoir is made from durable plastic and includes a reservoir cap to ensure a secure seal.

• Constructed from durable white plastic for corrosion resistance
• Includes reservoir cap for a tight seal
• Compatible with Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models
• Does not include mounting hardware or brackets
• Part number 603-158 ensures correct fitment

Product Details and Specifications

This washer fluid reservoir by Dorman is engineered to meet or exceed OEM specifications for the listed vehicle models, including Buick Rainier, Chevrolet Trailblazer and Trailblazer EXT, GMC Envoy series, Isuzu Ascender and Bravada, Oldsmobile Bravada, and Saab 9-7x. The reservoir is made from sturdy white plastic, providing resistance to wear and environmental factors. The included reservoir cap helps prevent fluid leakage and contamination. Note that mounting hardware and brackets are not included, so reusing existing components or purchasing separately may be necessary.

Compatible Vehicles and Applications

This washer fluid reservoir is compatible with the following makes and models:

• Buick Rainier
• Chevrolet Trailblazer, Trailblazer EXT
• GMC Envoy, Envoy XL, Envoy XUV
• Isuzu Ascender, Bravada
• Oldsmobile Bravada
• Saab 9-7x

Ensure compatibility by verifying your vehicle’s make and model before installation.

Common Issues Addressed by This Reservoir

• Leaking or cracked washer fluid reservoir
• Inability to hold washer fluid properly
• Contaminated or damaged reservoir cap causing fluid loss
• Washer fluid system malfunction due to reservoir damage
• Replacement for worn or deteriorated original reservoir

Installation Notes and Tips

Installation of the Dorman 603-158 washer fluid reservoir requires basic automotive tools. Since mounting hardware and brackets are not included, inspect existing components for wear and replace if necessary. Carefully disconnect washer fluid lines and electrical connectors before removing the old reservoir. After installation, refill with appropriate washer fluid and check for leaks. Follow vehicle-specific service manual instructions for detailed procedures.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, ensuring reliable performance and durability. The 603-158 washer fluid reservoir undergoes quality inspections to maintain consistent fit and function. Warranty coverage details can be obtained from Dorman or authorized distributors to confirm terms and conditions.