Dorman 603-158 Washer Fluid Reservoir - Front

Washer Fluid Reservoir for GM SUV Applications

This Dorman washer fluid reservoir is a direct replacement for select GM and Saab front washer systems. Built from plastic and supplied with a reservoir cap, it is made to handle underhood heat and engine vibration while maintaining proper washer fluid storage.

• Plastic construction with a white finish
• Reservoir cap included
• Direct replacement for specific front washer system applications
• Engineered for fit and performance on listed vehicles
• Cross-references OE part numbers 15046470 and 8150763950

Detailed Product Overview

Dorman 603-158 is a replacement washer fluid reservoir for front-mounted washer systems on select Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, Isuzu Ascender, Buick Rainier, Chevrolet Trailblazer EXT, GMC Envoy XL, GMC Envoy XUV, and Oldsmobile Bravada models. The reservoir is manufactured to withstand underhood heat and engine vibration, and it is tested for fit and performance on the specified vehicle applications. If you need a washer fluid reservoir for a 2002-2009 Chevrolet Trailblazer or a 2002-2009 GMC Envoy, this part number is a direct match for the listed front position.

This part number, 603-158, is also a practical replacement choice when servicing a leaking, cracked, or damaged washer tank on compatible GM SUVs. The included cap helps restore a sealed fluid storage system, and the white plastic reservoir matches the OE-style layout used on these applications.

What This Part Helps Address

• Washer fluid leaks from a cracked reservoir
• Low washer fluid storage caused by damaged plastic
• Broken or missing reservoir cap issues
• Poor windshield washer system operation from a compromised tank
• Replacement needs after heat- or vibration-related reservoir failure

Installation Notes and Tips

Install the reservoir in the front washer system location listed for the vehicle. Mounting hardware and mounting bracket are not included, so reuse the original components if serviceable. Verify hose routing, pump transfer, and cap seating before filling the system. Confirm fitment by matching the vehicle year, make, model, and front position to the application list before installation.

Quality Assurance

Dorman manufactures this washer fluid reservoir as a tested replacement part for specific vehicle applications. It is built to meet the fit and performance requirements of the listed models, including Chevrolet Trailblazer, GMC Envoy, and related GM SUV platforms. Part number 603-158 cross-references OE numbers 15046470 and 8150763950 for the same application.