HVAC Blower residual speed only. - Mercedes-Benz Forum

 
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post #1 of 2 (permalink) Old 07-08-2010, 04:04 PM Thread Starter
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Date registered: Jul 2010
Vehicle: 93 Mercedes-Benz 500 SEL
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HVAC Blower residual speed only.

93 Mercedes-Benz 500 SEL

The HVAC blower motor only operates at its lowest, residual speed.

Does this pretty much require replacement of the blower motor regulator?

Or is there a test to diagnose this component/system?

Further, the two outermost dash air ducts constantly vent heat, so I keep them closed. I'm thinking this is a vacuum pump problem.

I'm just starting with this analysis and would greatly appreciate some guidance.

Thanks, Wayne.
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post #2 of 2 (permalink) Old 07-11-2010, 09:42 PM
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