Dorman 603-177 Washer Fluid Reservoir - Front

Washer Fluid Reservoir for GM Trucks and SUVs

Dorman 603-177 is a replacement washer fluid reservoir for front-mounted windshield washer systems on select Cadillac, Chevrolet, and GMC applications. It is built from plastic to handle underhood heat and engine vibration, with fit and performance tested for the listed vehicle applications.

Key Features

• Plastic construction for underhood durability
• White reservoir body for direct replacement use
• Fits front washer system applications on select GM vehicles
• Thoroughly tested for fit and performance on specific applications
• Replacement part number 603-177 for service and repair

Detailed Description

This Dorman washer fluid reservoir is a direct replacement for select 2007-2013 Cadillac Escalade EXT, Chevrolet Avalanche, Chevrolet Cheyenne, Chevrolet Silverado 1500, GMC Sierra, and GMC Sierra 1500 models, plus 2007-2010 Chevrolet Silverado 2500, Silverado 2500 HD, Silverado 3500, Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD front washer system applications. Part number 603-177 is designed as a service replacement for the original reservoir when the factory tank is cracked, leaking, or no longer holding washer fluid. This part cross-references OE number 10382706 for the same application.

What It Helps Fix

• Washer fluid leaks from a cracked reservoir
• Low washer fluid capacity caused by damaged tank walls
• Washer system failure from a reservoir that no longer seals properly
• Loss of windshield spray performance due to reservoir damage
• Replacement needs after heat or vibration-related wear

Installation Notes and Tips

Mounting hardware is not included, and a mounting bracket is not included. The reservoir cap is not included. Verify the vehicle’s front washer system layout and compare the original reservoir shape, hose routing, and mounting points before installation. Confirm fitment for your specific Silverado, Sierra, Avalanche, Escalade EXT, or Cheyenne application using the vehicle year and model listed above.

Quality Assurance

Dorman tests this reservoir for fit and performance on the specified applications and manufactures it to withstand underhood heat and engine vibration. That validation helps support consistent replacement quality for 2007-2013 GM truck and SUV washer system service.