Pierburg 7.03665.66.0 Electric Water Pump - CWA400

The Pierburg 7.03665.66.0 is a high-performance electric water pump (CWA400 model) designed for engine cooling systems in BMW vehicles equipped with N20 turbocharged engines. This advanced brushless electric pump delivers superior cooling performance independent of engine RPM, offering precise coolant flow control for optimal engine temperature management.

Key Features:

• Brushless canned motor design for maintenance-free operation
• Variable speed control with integrated controller
• High flow capacity: 150 L/min at 0.85 bar, up to 220 L/min at lower pressures
• Operating voltage: 8-16 volts (12V nominal)
• Maximum current draw: 36.3A during operation, 0.2mA standby
• Wide temperature range: -40°C to 128°C (coolant), -40°C to 140°C (ambient)
• IP67 protection rating for durability and weather resistance
• Approximately 5,900 RPM operating speed
• Differential pressure rating: 0.85 bar

This OEM-quality replacement pump is manufactured in Germany and crosses to BMW part numbers 11517604027, 11518625097, and 11518635089. The CWA400 represents the next evolution in Pierburg's electric water pump technology, delivering more than double the hydraulic performance of previous models in a similarly compact package. Its brushless motor design ensures reliable, long-term operation with minimal maintenance requirements.