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  #16  
Old 01-13-2009, 05:59 PM
OldPokey's Avatar
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Quote:
Originally Posted by VW1300 View Post
Can someone explain to me what these resistors do in relation to the rest of the heat/fan/climate control system?

Thanks.
They go in series with the motor. The blower regulator bypasses resistors in order to make the motor go faster. More resistors in series with the motor == slower motor. Fewer resistors in series with the motor == faster motor.

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  #17  
Old 01-13-2009, 06:31 PM
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Does anyone know if someone can have a shop determine if either the temp. controller or the blower motor controller or the push button electronics can be tested to see if they are faulty? It can get quite expensive to just buy another used one to see if it fixes the problem. The used one may be no better or may get trashed by the other faulty parts in the system. I did see a picture of some special test unit made by Mercedes that has a connector that plugs into one of the controllers to diagnose problems.

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