location of Blower Relay Switch on 1993 Mercedes-Benz 600SEL

I need the location of the Resistor or Relay switch for the blower.

the blower resistor is mounted on the blower motor and is
sold as a separate part (1408218351 $308.00). this is located inside the engine compartment, passenger side at the cowl. remove plastic cover, then remove a/c cabin filter. the motor is there.
are you speaking of the airfilter in the engin compartment.what is the cowl