This hose runs from the automatic transmission cooler into the bottom of the expansion tank.

When you are replacing your coolant hoses, examine the rest of your cooling system to be sure that all these abused parts are being replaced. In numerous European car applications, hose flanges are made of plastic the cracks and leaks over time. Replace any suspect hose flanges and pick up some extra, factory-approved coolant to complete the job by looking under the Maintenance section of your specific model.