Assuming your 1987 300E does not have a cabin air filter... The blower resistor/regulator is located beneath the blower motor. Follow the procedure for getting to the blower motor, then remove the motor by diconnecting the red and blue wires. Then remove the motor cradle. There are 2 hex-head screws securing the blower regulator. Remove them, then wiggle the regulator out carfeuuly, toward the drivers side (left) of the car. There is a pin in the bottom of the regulator that fits in a hole underneath it, so you have to work that pin out of the hole below the regulator. The regularor you need is available from several vendors. The Replacement-brand SKU is REPM191902. The original Mercedes part number is 2015400845. IF your vehicle has a cabin air filter, the procedure is similar, but the Replacement SKU for the part is REPM191901. BE VERY sure you order the correct part. The wrong part would be electrically equivalent but has a very different shape and will not fit.
In the 1987 Mercedes-Benz 560SL, the blower motor resistor is typically located under the dashboard on the passenger side. To access it, you may need to remove the lower dashboard cover. The resistor is usually mounted near the blower motor itself and is responsible for controlling the speed of the blower fan. Always refer to the vehicle's service manual for specific instructions and safety precautions when working on electrical components.
you access the fan blower by removing the windshield wiper motor from the outside of the car.
The resistor has power going to it but, the resistor may be burned out and no power is coming out of it. Check for power at the blower motor connection.
It is probably no longer a rsistor but a transitor control model on the fire wall.
To change the AC blower on a 1987 Mercedes-Benz 420 SEL, first disconnect the negative battery terminal for safety. Remove the passenger side under-dash panel to access the blower motor. Disconnect the electrical connector and remove the screws securing the blower motor in place, then take out the old motor and replace it with the new one, reassembling in reverse order. Finally, reconnect the battery and test the blower to ensure it's functioning properly.
You can check the blower motor by unplugging the wire harness and connecting a jumper wire directly from the battery positive terminal to the blower motor. Be very careful to avoid touching the jumper wire to ground to avoid arcing. If the blower motor runs then there may be a blown fuse, bad resistor pack, wiring issues or bad switch.
First check fuse under dash. Then check voltage to blower motor. Then replace resistor under glove compartment. Then move to switch behind dash panel. Then blower relay if no voltage.
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The blower motor on a 1987 Jeep Wrangler is typically located under the dashboard on the passenger side. It is mounted to the heater box and can be accessed by removing the lower dash panel. You may need to disconnect the electrical connector and remove a few screws to remove the blower motor for service or replacement.
More than likely the blower resistor is bad....I recently ran into this problem in my 91 Vette...Hope this helps!
first thing to check is the fuse
On a 87 Jeep Wagoneer Limited 4x4, 242cid 4.0L, M.O.H.V. - M, it is located under the kick plate on the passenger side. Unscrew the plate and you will see the vacuum motor (which looks like a flying saucer) and to the left of it you will see the resistor. Unplug the four prong wire, and unscrew the two screws holding it in the duct, and lift out. (Takes about ten minutes to remove)