Removing and installing auxiliary fan preresistor - AR83.30-P-5370D

MODEL 140 up to 30.11.94 

Fig 1: Identifying Auxiliary Fan Preresistor Components

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Location of connections to auxiliary fan preresistors (R15, R15/1) on 3-stage auxiliary fans 

Fig 2: Identifying Location Of Connections To Auxiliary Fan Preresistors On 3-Stage Auxiliary Fans

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location of connections to auxiliary fan preresistors (R15, R15/1) on 2-stage auxiliary fans 

Fig 3: Identifying Location Of Connections To Auxiliary Fan Preresistors On 2-Stage Auxiliary Fans

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removal, installation
1	Disconnect negative pole on battery
2	Unclip clips (1)
3	Unscrew screw clips (2)
4	Remove grille
5	Unscrew nuts (3)	4 each
6	Remove electrical leads
7	Unscrew nuts (4)	2 per preresistor
8	Reinstall in opposite order
9.1	Check 3-stage auxiliary fans for proper function as follows
10.1	Disconnect connector on coolant temperature sensor (B10/8) or (B11/4). Set resistance decade to 310 Ω (stage 1) or 250 Ω (stage 2).		Fig 4
11.1	Ignition ON
12.1	Set pushbutton control module (Automatic AC) to "AUTO"
13.1	Auxiliary fans should rotate to right	After completing the work erase DTC memory in pushbutton control module (diagnosis manual)
9.2	Check 2-stage auxiliary fans for proper function as follows ↓
10.2	Disconnect connector from coolant temperature sensor (B10/8) or (B11/4, pin 1 and 2) and connect resistance decade. Set resistance decade to 310 Ω
11.2	Ignition ON
12.2	Set pushbutton control module (Automatic AC) to "AUTO"
13.2	Auxiliary fans should rotate to right	After completing the work erase DTC memory in pushbutton control module (diagnosis manual)

Fig 4: Identifying Resistance Decade (124 589 09 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.