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It is probably the motor itself it sounds like u have a bearing going bad you can view my tutorial on this at the following link it will help u test this problem http://www.benzworld.org/forums/w201-190e-d-class/1358590-troubleshooting-Mercedes-Benz-190-e-d-210-tempmatic-climate-control-system.html#post2716281

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Q: Your 1990 190E Mercedes Benz makes a loud noise when you turn on the ACHeater fan switch Could it be the blower motor However the fan is workingjust loud?
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