(Replace Fan Unit Wiring Harness - AN31.19-P-8100-07LWG)

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Model 253.3/9 up to 5/31/19

GROUND POINTS

Number	Designation			Model 253 (except 253.99)	Model 253.99
BA00.19-P-1003-01E	Left front ground point	W2/2	Nm	10	10

FUSE AND RELAY BOX

Number	Designation			Model 253
BA54.15-P-1003-01K	Nut, positive line to engine compartment prefuse box	M6	Nm	8
BA54.15-P-1003-01K	Nut, positive line to engine compartment prefuse box	M8	Nm	16

Fig 1: Identifying New Passenger Car Wiring Harness Repair Kit (220 589 04 99 00)

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Fig 2: Identifying Wiring Harness Repair Kit, Basic (000 589 13 99 00)

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Routing diagram

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Wrap fan motor wiring harness (33) with felt tape, starting at the branch-off line of the brown line (BN).
Detach black 4-pin connector (30) from fan motor.

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Mark contact cavity assignment of black 4-pin coupling housing (30.1).
Remove contact spring (31) of brown line of vehicle wiring harness from black 4-pin coupling housing (30.1).
The appropriate tool is available in the basic wiring harness repair kit or the supplementary passenger car wiring harness repair kit.
Remove contact spring (32) of red line of vehicle wiring harness from black 4-pin coupling housing (30.1).
The appropriate tool is available in the basic wiring harness repair kit or the supplementary passenger car wiring harness repair kit.
Cut off contact springs (31 and 32) of vehicle wiring harness.
Tie back brown line of vehicle wiring harness and insulate.
Tie back red line of vehicle wiring harness and insulate.

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Detach brown line of vehicle wiring harness from left front ground point (W2/2).
Cut line lug off brown line of vehicle wiring harness.
Tie back brown line of vehicle wiring harness and insulate.

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Route brown line (BN) of fan motor wiring harness (33) to left front ground point (W2/2) and connect .

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Install contact spring (33.2) of brown line of fan motor wiring harness (33) in black 4-pin coupling housing (30.1).
Ensure that seal is correctly seated.

Otherwise water could enter which could then cause a short circuit or corrosion.

The contact cavity assignment was marked previously.
Install contact spring (33.1) of red line of fan motor wiring harness (33) in black 4-pin coupling housing (30.1).
Ensure that seal is correctly seated.

Otherwise water could enter which could then cause a short circuit or corrosion.

The contact cavity assignment was marked previously.

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Route red line (RD) of fan motor wiring harness (33) along existing lines to engine compartment prefuse box (F32/3).
Make sure that movement of the wiper arms is unobstructed.

Otherwise the red line (RD) can be sheared off, thereby causing a short circuit.

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Detach red line of vehicle wiring harness from contact cavity 3 (arrow) of engine compartment prefuse box (F32/3).
Cut line lug off red line of vehicle wiring harness.
Tie back red line of vehicle wiring harness and insulate.
Attach red line (RD) of fan motor wiring harness to contact cavity 3 (arrow) of engine compartment prefuse box (F32/3) .

Courtesy of MERCEDES-BENZ USA