After I have my a/c running and I stop the car and turn the engine off, the aux fans continue to run on low speed, even with the key out. This only happens when I drive and I run the a/c. The fans seems to run for....I don't know how long, but it drained my battery today. The other day they ran for about a 1-3 mins before shutting off on their own. Anyone have any ideas? I checked the silver relay at the back of the fuse compartment and even swapped it out, but it continues to do it. I disconnected the wires at the engine block to get the high speed fans to turn on, then I reconnected and shut the engine off, but the low speeds kept running. Please help.

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1990 190E 3.0L