Dorman OE Solutions Engine Coolant Reservoir for 1987-1992 BMW 735i 603-538

Pressurized coolant reservoir for 1987 to 1992 BMW 735i 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 and engine vibration while matching the original part's fit and function.

Key Features

• Direct replacement for original equipment coolant reservoir
• Constructed from durable materials resistant to heat stress
• Engineered to match OE form, fit, and function
• Designed to handle standard engine vibration
• Validated through testing for dependable performance

Benefits

• Restores proper cooling system pressure and capacity
• Prevents coolant leaks caused by cracked plastic tanks
• Ensures a smooth installation with no modifications needed
• Reduces the risk of repeat repairs and overheating
• Provides a cost-effective solution compared to dealer parts
• Backed by Dorman's century of automotive experience

Application

Ideal for BMW 735i owners experiencing coolant loss, visible cracks in the factory tank, or failed pressure tests who need a trustworthy direct-fit replacement.

Fitment Notes

• Fits 1987, 1988, 1989, 1990, 1991, and 1992 BMW 735i models
• Replaces BMW part number 17111712196

Why Choose Dorman - OE Solutions?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function, helping ensure a smoother installation and reliable results while standing up to daily driving demands.

What's in the Box

• 1 Engine Coolant Reservoir

Item Dimensions

• 20.5 inches x 7.9 inches x 7.1 inches
• Weight: 1.7 lbs