Dorman Washer Fluid Reservoir with Cap for Cadillac/ Chevrolet/ GMC — Direct-Fit, Heat-Resistant Replacement

The Dorman 603-072 washer fluid reservoir with cap is a direct-fit replacement tank designed to restore reliable windshield washer fluid storage and delivery on select Cadillac, Chevrolet, and GMC models.

This replacement reservoir is molded to match the original equipment's shape and mounting points so it integrates cleanly into the engine bay. Built from durable plastic formulated to resist heat and vibration, the tank is intended for drivers who need to repair a cracked or leaking reservoir without modifying mounting brackets or plumbing. Use the vehicle compatibility tool to confirm fit before ordering; some applications may require additional fitment notes.

How does this reservoir restore windshield washer function?

Replacing a cracked or leaking reservoir stops fluid loss and restores the system's ability to supply washer fluid to the wiper nozzles. The reservoir includes the filler neck and cap locations so you can refill and seal the system like the original design.

• Direct replacement dimensions and mounting points for specified models
• Retention points maintain original hose and pump positions
• Cap seating area designed to prevent leaks under normal use

Will the Dorman 603-072 fit my vehicle without modification?

Many vehicle applications accept this reservoir as a bolt-in swap, but fitment varies by year and trim. Enter your vehicle details into the online garage tool and review the Confirmed Fit indicator to make sure this part matches your exact model and equipment level.

• Check year, make, and model using the product page tool
• Look for an information icon for special fit notes or exceptions
• Some installations may require reusing the original pump or hoses

What materials and construction make this a lasting repair?

The reservoir is produced from robust plastic chosen to tolerate elevated engine bay temperatures and the continual vibration of daily driving. Tough construction helps reduce the chance of stress cracks and provides longer service compared with worn original parts.

• Heat-resistant plastic formulation helps prevent warping
• Reinforced mounting areas resist fatigue from vibration
• Finished edges and inlet/outlet bosses align with factory components

How do I install the replacement tank and what else might I need?

Installation is straightforward for those with basic automotive skills: drain remaining fluid, disconnect electrical and hose connections, unbolt the old reservoir, and swap in the new unit. Keep the original pump and hoses if they are undamaged; otherwise order replacements to ensure leak-free operation.

• Tools needed: basic hand tools and a drain container
• Inspect pump, grommets, and hoses; replace if brittle or cracked
• Refill with recommended washer fluid and test system for leaks

Who is this for: The Dorman 603-072 is intended for DIY mechanics and professional technicians repairing select Cadillac, Chevrolet, and GMC vehicles that have a cracked, leaking, or otherwise damaged washer fluid reservoir. It’s also suitable for fleet managers seeking a cost-effective, reliable replacement that follows original mounting and fill arrangements. Always verify vehicle compatibility using the fitment tool before purchase and review any model-specific notes to confirm whether additional parts are required for a complete repair.