S 430 4MATIC (220.183) V8-4.3L (113.948) (2003)
Refrigerant Control Solenoid Valve: Description and Operation
Purpose
Since the vehicle only has one A/C compressor, the refrigerant shutoff valve for the rear refrigerant circuit has to shut off the refrigerant when the rear air
conditioning is switched off or before the evaporator in the rear air conditioning ices up.
Function