S 550 (221.171) V8-5.5L (273.961) (2007)
Heater Control Valve: Description and Operation
GF83.20-P-3125SX AC Water Valve, Component Description
AC Water Valve, Component Description
Component Identification
Location
The air conditioner water valve is centrally located in the radiator tank underneath the windshield wiper mechanical system.
Task
After the engine has reached its operating temperature, the air conditioner water valve opens the connection between the heater heat exchanger and the
radiator.
It is only now that heated-up coolant flows through the heater heat exchanger.
Function
The request for opening or closing is transmitted by the AAC [KLA] control unit (N22/1) via the interior CAN to the front SAM control unit with fuse
and relay module (N10/1), which directly actuates the air conditioner water valve.