How do you change Volvo 850 timing belt?

To change the timing belt on a Volvo 850, first ensure the engine is cool and disconnect the battery. Remove the engine cover and any components obstructing access to the timing belt, such as the serpentine belt and crankshaft pulley. Align the timing marks on the camshaft and crankshaft, then remove the old belt and replace it with the new one, ensuring proper tension. Finally, reassemble all components, double-check alignment, and reconnect the battery.