Removal and installation of the blower motor for module box - ra54001402350x(2350)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

A. Removal and installation, B. Function Model 140 up to approx. 07/93

Operation no. of operation texts and work units or standard texts and flat rates:

Removing and installing

Preliminary work:

Right engine compartment cover removed.

Dust filter removed.

Fig 1: Identifying Cable, Blower Motor, Connector, Bracket And Screws

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Quiescent current retention unit	disconnect, connect.
Ground cable at battery	disconnect, connect.
Screws (1)	unscrew, screw in.
Bracket (2)	take off, insert.
Connector (M2/2x1)	unplug, plug in.
Blower motor (M2/2)	take out, plug in.
Cable (3) of blower motor (M2/2)	withdraw, insert.

COMMERCIALLY AVAILABLE TESTER

Quiescent current retention unit

e.g. Hans Zeheter CMP 12.2

Function
The blower motor (M2/2) for cooling the control modules in the module box is switched on and off by the temperature sensor in the basic module N16/1. The blower motor is located in the blower box of the car heating system.

The required cooling air is drawn from the interior in the area of the glove box and routed into the blower box of the car heating system.

Fig 2: Identifying Module Box And Module Box Blower Motor
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The blower motor (M2/2) is switched on:
1. for 1.5 seconds each time the engine is started if an engine speed of 1200 rpm is exceeded.
2. if the temperature in the module box is above 60 °C (engines 104, 119, 603) or above 55 °C (engine 120).
The blower motor (M2/2) is switched off: 1. at a temperature below 55 °C (engines 104, 119, 603) or below 50 °C (engine 120).

If a limit temperature (approx. 70 °C) is exceeded when driving despite the blower motor (M2/2) being switched on, this is stored as fault 5 in the diagnosis of the basic module N16/1).