89 audi 100, fan problems

Ok, My 89 audi is having some probelms. I think it was yesterday, i pulled into my driveway after work and noticed the fan, the one right behind the radiator, wasn't stopping. I figured that it would stop
within 5-10 minutes. I came back out 15 minutes later and the fan was still running. I started my vehicle to make sure the battery wouldn't die, and then turned off my car again. Once again i waited for another 15 minutes, with the car off, but the fan kept on runnning. So now whenever i want to drive my car i have to pull the battery so the fan will stop. Please any ideas will help.
Thank you, Jimmie

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