The LESJOFORS 4492521 rear coil spring is engineered specifically for the 2009 Toyota Sienna AWD equipped with air conditioning. This premium-grade coil spring is designed to restore and enhance the vehicle's suspension performance, ensuring optimal ride quality and handling. Manufactured by LESJOFORS, a company with over 160 years of experience in spring manufacturing, this coil spring meets or exceeds original equipment specifications, providing a reliable and durable solution for your fleet's maintenance needs. Constructed from high-strength steel, the LESJOFORS 4492521 coil spring undergoes a meticulous manufacturing process that includes heat treatment and shot peening. These processes enhance the spring's durability and fatigue resistance, ensuring it can withstand the demands of daily operations. A multi-layered corrosion-resistant coating, comprising zinc phosphate and epoxy powder coating, offers superior protection against environmental factors, extending the spring's service life and reducing the frequency of replacements. The pre-setting process ensures that the spring maintains its shape and performance over time, contributing to consistent ride height and handling characteristics. This precision manufacturing results in a coil spring that not only meets but often exceeds the performance of the original equipment, providing a cost-effective solution for fleet operators seeking to maintain vehicle performance and safety. By choosing the LESJOFORS 4492521 rear coil spring, fleet operators invest in a product that delivers enhanced durability, improved ride quality, and reduced maintenance costs. This coil spring addresses common operational challenges such as suspension wear and fatigue, ensuring that vehicles remain in optimal condition, thereby maximizing uptime and operational efficiency. LESJOFORS' commitment to quality and innovation makes this coil spring a valuable addition to any fleet maintenance program, offering a reliable and long-lasting solution to suspension component needs.