Dorman OE Solutions Engine Coolant Reservoir for 1999-2003 BMW X5 and Z3 603-336

Pressurized coolant reservoir for 1999 to 2003 BMW X5 and Z3 models used 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 engineered to withstand underhood heat cycles and engine vibration without failing.

Key Features

• Direct replacement for original equipment part numbers including 17107514964 and 17111712669
• Manufactured from durable materials designed to resist thermal stress and cracking
• Engineered to match the fit and function of the factory coolant expansion tank
• Validated through testing to ensure consistent performance under daily driving conditions
• Sold as a single complete unit ready for installation

Benefits

• Restores proper cooling system pressure to prevent overheating issues
• Eliminates coolant leaks caused by worn or damaged factory reservoirs
• Provides a precise fit that simplifies installation and reduces modification needs
• Helps avoid repeat repairs by using components built for long-term durability
• Ensures engine safety by maintaining correct coolant levels and system integrity

Application

Ideal for BMW owners experiencing coolant loss, visible cracks in the expansion tank, or warning lights related to low coolant levels on X5 and Z3 vehicles from the late 1990s to early 2000s.

Fitment Notes

• Compatible with 1999-2003 BMW X5 models
• Compatible with 1999-2002 BMW Z3 models
• Verify vehicle compatibility using provided OEM part numbers before purchase

Why Choose Dorman - OE Solutions?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function
• Backed by over 100 years of automotive aftermarket experience and a focus on durability
• Built with quality materials and validated through testing to stand up to daily driving demands

What's in the Box

• 1 Engine Coolant Reservoir

Item Dimensions

• Length: 11.1 inches
• Width: 8.2 inches
• Height: 7.7 inches
• Weight: 2.9 lbs