BMW 525i coolant leak from driver's side, possibly from transmission cooler or upper radiator hose connector on BMW 525i

Some BMW 525i owners report experiencing coolant leaks from the driver's side, particularly around the transmission cooler or upper radiator hose connector. These leaks can often be attributed to loose hose connections, which may allow coolant to escape from the upper radiator hose. Additionally, a broken radiator could be a significant source of the leak, especially if it is located on the driver's side. A failed water pump is another common issue that may lead to coolant escaping near the transmission cooler. To address these problems, owners are advised to inspect the coolant reservoir for low levels or discoloration, visually examine all coolant hoses and clamps for cracks or loose connections, and check the radiator for leaks around the seams. Early identification and prompt repair of these leaks are crucial to prevent costly engine repairs in the future.