87 300sdl blower motor chirp/squeal - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 11-17-2006, 11:02 AM Thread Starter
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Date registered: Nov 2006
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Angry 87 300sdl blower motor chirp/squeal

87 300 SDL, 126 body. Heater blower motor chirps/squeals when on low or low/auto. I also get feedback into am radio when blower is on. After first working on old blower motor and reinstalling and then installing a new blower motor and a used blower regulator, blower motor[s] still squeals or chirps on low and auto (when auto is near low, when blower is on high or auto/high there is no noise). Always occurs when auto starts until auto is at high. While it sounds like it might come from the blower motor bearings or squirell cage it does not. I have one old motor and one new one, they both do the same. Noise sounds like it is coming from windings. It makes no difference whether the blower motor[s] is installed in blower motor housing or if it is sitting on the floor of car all hooked up and running outside of the housing, the blower motor still makes this whining, squealing, chirping or whatever we want to call it. When the blower motor picks up speed, noise also does until it gets near high. For sure there is no noise when on high and it blows like crazy. This noise feedbacks into radio when AM is on. New radio by the way. Got the problem solved for about a week by cleaning up the regulators connections. Then it came back. Some folks say it is the regulator. Any ideas before I keep buying parts?
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