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Home >> Mercedes Benz >> 2007 >> CL550 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control -- Cl550 -- 216 Chassis >> Basic Knowledge >> AC water valve, component description - GF83.20-P-3125SX

AC water valve, component description - GF83.20-P-3125SX

MODEL 216.3, 221.0 /1 up to Model Year 8 

Shown on model 221.0 

Fig 1: Identifying AC Water Valve
G07638780Courtesy of MERCEDES-BENZ USA

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.