95 e320 blower motor fault
 

Please Help! My 95 E320 a/c blower motor only runs at high speed in auto mode. This is too high for comfort and minimum is not very useful. Is there a convenient way to check for proper output from the auto climate control unit to the blower regulator (n29) or should I just spring for a new regulator? Are they prone to fail in this way? Is there a way to easily bypass the auto mode altogether and wire in an intermediate mode which to me makes more sense anyway? Any help on this matter will be appreciated.

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Blower regulator trigger feed wire is yellow on the 3 wire connector on firewall. [y/b/r].. there should be variable voltage [ 2-8 approx] at that connector from Control panel inputs. If No , CP is suspect , if Yes , blower regulator is suspect........