Why does the engine cooling fan always run on a 1989 Ford Festiva?

The engine cooling fan on a 1989 Ford Festiva may always run due to a faulty temperature sensor, which could mistakenly signal the fan to operate continuously. Additionally, a malfunctioning relay or wiring issue could cause the fan to stay on regardless of the engine temperature. It's also possible that the fan's control module is defective, preventing it from receiving proper signals to turn off. Checking these components can help diagnose and resolve the issue.