Check the Heater blower regualtor which is the aluminum piece under the motor itself. It has a bunch of aluminum rods that stick out. We call it a porcupine.

These fail all the time ! =)

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1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."