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Home >> Mercedes Benz >> 1996 >> S 320 SWB (140.032) L6-3.2L (104.994) >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - HVAC >> Control Module HVAC >> Description and Operation >> Auxiliary Fan Control Module
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Auxiliary Fan Control Module



The auxiliary fan control module switches on the auxiliary fan.

The pushbutton control module controls the AIR control module (N65/1) with a minimum of 3 mA and max. 10 mA.

The AIR control module (N65/1) compares these values with stored values and switches on the auxiliary fan (M4) under the following conditions:

- Outdoor temperature >5 °C
- Refrigerant pressure = 13 bar
- Coolant temperature = 103 °C
- Limp-home mode (e.g. refrigerant pressure > 20 bar)

The auxiliary fan (M4) is switched off under the following conditions:
- Refrigerant pressure = 12 bar
- Coolant temperature = 100 °C

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