Dorman OE Solutions Engine Coolant Reservoir for 1991-2003 BMW 603-537

Pressurized coolant reservoir for 1991 to 2003 BMW models designed to replace cracked or leaking factory expansion tanks.

Built to meet the manufacturer's design intent for reliable service, this unit is constructed from quality materials capable of withstanding underhood heat and engine vibration while maintaining proper system pressure.

Key Features

• Direct replacement for original equipment part numbers including BMW 17111741167
• Engineered to match the fit and function of the factory component
• Constructed from durable materials resistant to thermal stress
• Validated through testing to ensure dependable performance
• Manufactured by Dorman with over 100 years of aftermarket experience

Benefits

• Restores proper coolant capacity and system pressurization
• Helps prevent overheating caused by reservoir leaks or cracks
• Reduces the risk of repeat repairs with a trustworthy design
• Ensures a smoother installation with direct-fit engineering
• Provides a cost-effective solution compared to dealer parts

Application

Ideal for BMW owners experiencing coolant loss, visible cracks in the old tank, or failed pressure tests who need a reliable OEM-style replacement to keep their vehicle operating correctly.

Fitment Notes

• Compatible with select BMW models from model years 1991 through 2003
• Verify specific vehicle compatibility using part number 603-537 before purchase

Why Choose Dorman - OE Solutions?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function
• Built with quality materials and validated through testing to stand up to daily driving demands
• Offers a smart way to restore your vehicle with confidence in fit and durability

What's in the Box

• 1 Engine Coolant Reservoir

Item Dimensions

• 11.8 inches x 5.7 inches x 6.5 inches
• Weight: 1.3 lbs