If your blower motor is on when you stop the vehicle:
1)your engine might be having a thermostat or engine cooling issue
2)your exterior thermostat is different than your "engine cooling fan".
It may be cool outside(separate thermostat),yet your engine temp.(separate thermostat)fan will kick on once "engine temp. reaches a degree where it is necessary to be cooled.
Be sure to check the following:
coolant level/indicator light
thermostat temp
heater motor fan
OEM Conti Tech Belt
Open the bonnet, remove the scuttle cover, wiper motor, and finally blower motor.
The blower motor for a 1993 Mercedes 190E is located under the dashboard on the passenger side of the vehicle. To access it, you typically need to remove the glove compartment and possibly some paneling. The blower motor is mounted to the HVAC housing, making it essential to be cautious during removal and installation to avoid damaging any surrounding components.
In the 1993 Mercedes 190E, the blower motor is located behind the dashboard on the passenger side. To access it, you typically need to remove the passenger side footwell cover and possibly some other dashboard components. Once exposed, the blower motor is mounted to the HVAC housing and can be disconnected and removed for servicing or replacement.
The blower motor fuse for a 1992 Mercedes-Benz 190E is located in the fuse box, which is typically found under the dashboard on the driver's side. Specifically, you should look for fuse number 5 or 6, depending on the vehicle's configuration. Always refer to the owner's manual for the exact fuse layout and specifications before replacing any fuses.
The blower motor is probably busted, or the blower speed switch could be busted as well, if that isn't it could be a fuse for the blower motor I would check that first and save your self alot of time and money.
To locate the blower control resistor, windshield wiper then plastic panels under windshield wiper must be removed. Then remove wiper motor and linkage assembly. In the center of the car under the wiper linkage the plastice heater motor cover must be removed. Remove heater motor. The resistor/controller mounts directly below the heater motor. Resistor unit and wire harness must be removed as an assembly. Install new resistor and work back through directions. Due to the amount of labor involved it is recommended to check the blower motor at the same time.
the sampler fan pulls cabin air across a temperature sensor so the automatic climate control can figure out the interior temperature. sometimes when they get noisy you can quiet them by blowing a short blast of compressed air into the air inlet to knock the dust off the fan blades.
See my tutorial on this at the following link http://www.benzworld.org/forums/w201-190e-d-class/1358590-troubleshooting-mercedes-benz-190-e-d-210-tempmatic-climate-control-system.html#post2716281
It is probably the motor itself it sounds like u have a bearing going bad you can view my tutorial on this at the following link it will help u test this problem http://www.benzworld.org/forums/w201-190e-d-class/1358590-troubleshooting-mercedes-benz-190-e-d-210-tempmatic-climate-control-system.html#post2716281
castrol magnatex 10w 40 a3/b3
castrol magnatex 10w 40 a3/b3
Left side of engine under the intake manifold.