How do you replace a fan on a 2005 Chevy Express?

To replace the fan on a 2005 Chevy Express, first disconnect the negative battery cable to ensure safety. Remove the fan shroud by unscrewing the bolts and carefully lifting it out. Next, detach the fan from the water pump by loosening the fan clutch bolts and pulling the fan off. Finally, install the new fan by reversing the process, making sure everything is securely fastened before reconnecting the battery.