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Home >> Mercedes Benz >> 1994 >> C220 >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (Climate Control - 140 Chassis) >> Basic Knowledge >> Auxiliary fan, location/function - GF83.40-P-2115 >> Auxiliary fan, function - GF83.40-P-2115-01S

Auxiliary fan, function - GF83.40-P-2115-01S

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Function 

The auxiliary fans (M4) are switched on with infinite speed adjustment depending on the refrigerant pressure and/or coolant temperature.

The pushbutton control module receives the coolant temperature from the A/C coolant temperature sensor and the refrigerant pressure from the refrigerant pressure sensor.

This input information is transferred to the auxiliary fan control module by the pushbutton control module. The auxiliary fan control module processes this information and compares it with stored values. The resulting request for the fan output is then transferred to the auxiliary fan.

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