Question about 1990 Mercedes-Benz 300 Diesel

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Mercedes blower motor.

Fan blower on 1990 Mercedes 300sel will work when removed from the vehicle. Installed it apparently is getting no voltage. Suspect relay but I have not yet got my hands on a wiring diagram. Any suggestions please.


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  • Anonymous Mar 14, 2014

    how to remove the fuel tank on a mercedes 300sel

  • Anonymous Mar 30, 2014

    How to I replace the blower motor

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Check the blower fuse? check for voltage at the switch (requires removing heater / ac controls from dash on most vehicles.)

Posted on Apr 22, 2010

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2003 dodge dakota air conditioning fan has stopped working.


The diagram is for v6. The top wire at blower motor is voltage, the bottom wire is ground. Use a test light and check both voltage and ground. Key on--hvac on. If you have good voltage and ground with no blower action, suspect the blower motor. The blower motor is usually under the passenger side dash.
blower motor-4w4l4yu4it40zmugu2c5pbyo-3-0.jpg

May 08, 2018 | Dodge Cars & Trucks

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Could a defective alternator cause fan motor to malfunction on Jeep cherokee?


What I can tell you is an Alternator can produce dirty electricity besides low or high voltage if the embedded regulator malfunctions. How "high tech" your fan motor is probably depends on the fan blower motor resistor. Advanced Climate Control goes beyond the simple setting for low, medium, or high. You can have a good Alternator and blower fan and be the victim of a bad blower fan resistor.

You can get your Alternator checked for free at Autozone, Advance, or Oreilys and it can be checked without removing it from the vehicle.

Sep 19, 2014 | Cars & Trucks

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Want to change fan on blower heater


Removal

  1. Remove wiper arms.
  2. Remove cowl panel.
  3. Disconnect blower motor electrical connector and vent tube.
  4. Remove blower motor retaining screws.


  1. Remove fan retaining nut from blower shaft through plenum opening while holding the fan from the engine compartment.
  2. Remove fan from blower motor while removing blower motor from vehicle.
Installation

  1. Hold fan through plenum opening.
  2. Install blower motor to vehicle while installing fan to blower motor.
  3. Install fan retaining nut to blower motor shaft through plenum opening.
  4. Install blower motor retaining screws.
  5. Connect electrical connector and vent tube.
  6. Install cowl panel.
  7. Install wiper arms.

Aug 13, 2013 | 1991 Oldsmobile Cutlass Ciera

1 Answer

Heater blower not working


put 12 volt power to terminals on fan itself, if the fan works its the switch thats bad. or a fuse or relay ! if need be try and get another switch from same vehicle at junk yard. because the dealers are out to rob you. replace switch if motor and fuses are good. check the wires at motor to see if they are getting voltage. if not the switch is bad. sometimes if blower motor resistor is bad, fan will not blow on any speed. check this first. its beside the fan motor. if you need more info, just type in on computer. location of blower motor 2001 intrigue. good-day !

Dec 18, 2011 | 2001 Oldsmobile Intrigue

1 Answer

Where is the blower motor? heater in car dosent blow. not under hood, cant get through glover compartment.


This work for 1998 Buick Century 3.1L SFI OHV 6cyl; the blower motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed. Depending on the HVAC (Heater Ventilation Air Conditioning) option installed in the vehicle, blower speed control could be through a set of resistors or through a solid-state blower motor control module.

In general, this system is reliable. Because so many of the control operations are electronic, special diagnostic equipment really should be used for system diagnostics and check-out. An authorized technician using a scan tool can most quickly locate HVAC problems.

zjlimited_78.jpg

Fig. Typical behind-the-instrument panel view of HVAC related components. Depending on the HVAC option, not all components are used on all vehicles (click for zoom)

zjlimited_79.jpg

Fig. Typical HVAC operation schematic

An inoperative blower motor could be caused by the following:

* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.

REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable.
  2. The blower motor is located on the passenger side of the vehicle, under the instrument panel. Remove the right side sound insulator (trim panel) by removing the retainers and disconnecting the courtesy lamp.
  3. Detach the blower motor electrical connector. Some applications may have cooling hose to the motor which should be disconnected.
zjlimited_80.jpg

Fig. Blower motor and fan assembly removal

  1. Unfasten the blower motor mounting screws, then remove the blower motor from the vehicle.
  2. If the blower motor fan (also called a 'squirrel cage') must be replaced, use the following procedure:
NOTE Do not hammer on the motor to remove or install the fan. Do not apply force to the motor housing to seat the fan on the motor, or motor/shaft bearing damage could result. Do not apply pressure to the fan rim. Be sure the correct replacement part is used.
  1. Remove the metal star clip retaining the fan cage to the motor shaft.
  2. Remove the fan by pulling straight out.
To install:
  1. If removed, install the blower motor fan, as follows:
    1. Install the replacement fan cage onto the motor shaft.
    2. Adjust the fan cage to get a clearance of 0.30 inch (7.5mm) to the motor mount plate.
  2. Install the remaining components in the reverse of the removal procedure. Make sure the electrical connection is secure. Tighten the motor screws to 14 ft. lbs. (20 Nm).
  3. Connect the negative battery cable, then test the blower motor for proper operations


I hope this helps (remember to rate and comment this answer).

Nov 17, 2010 | 1998 Buick Century

1 Answer

94 Mercedes-Benz e320 how and where is blower for ac


the blower motor for the a/c is located under the windshield wiper motor. you access it from the engine compartment by removing all the trim covers under the windshield, also have to remove the wiper motor and assembly but be careful not to crack the windshield. once you pull all the covers out of the way you will see the blower motor housing. remove clips and voltage regulator in order to remove top cover of blower motor housing.

Sep 27, 2010 | 1994 Mercedes-Benz E-Class

2 Answers

2005 Chevrolet Silverado - Fan not coming on. When I turn the heater/ac blower fan on, fan does not work. Prior to completely going out, fan would quit working intermittently. Is this a fuse problem? ...


Chk for power at the blower motor electrical connector. If no voltage, check the blower motor resistor, its within the blower motor vent (this controls power to the blower motor). Also, in theses vehicles water may have damaged the blower motor itself. Inspect the blower motor for proper function.

Aug 10, 2010 | 2005 Chevrolet Silverado 1500HD

1 Answer

The blower motor will not work in the vehicle but I can hook up a 12 volt source from the outside and it will work what could be the problem?


I would think that either the fan switch or the resistor would be your problem if you've ruled out any fuse or wiring issues. By testing the voltage going in & out of both components, preferably with a digital multimeter but a 12 volt test light can be used, you will eliminate purchasing parts needlessly. If you end up getting voltage to the fan then see below remarks.

The blower motor still could be bad depending upon how you're jumping it. The vehicle wiring is only equipped to send a certain amount of amps to the blower motor & you may be using wiring that is larger, or connecting directly to a power supply that would make even a weak motor work by providing much more amperage than the vehicle usually does..

You can generally note that a worn motor doesn't turn by hand as smoothly as it should, causing the need for maximum amperage to get it started, tough to do in a car when everything is cold.

I suggest a Vehicle specific manual to aid in troubleshooting if you are unfamiliar with removing those components.

good luck.

Feb 15, 2010 | 1997 Volkswagen Jetta

1 Answer

My heat and AC fan wont come on and all the fuses are fine


What I would do is pull the fan blower motor speed switch, plug the wires back into it while you're holding it in your hand, run the car, and check with a multitester and see if you are getting voltage at the switch. Should be something like:
High=12-14 volts
MHi=8-10 volts
MLo=4-6 volts
Low=2-4 volts
OFF=no voltage

If you get voltage but the fan still doesn't work, then it's either a bad ground, or the motor is bad. If you can access the blower motor wire connections(sometimes its easier to try this with it removed from the vehicle), then you could try jumping the blower motor at the wiring connection with a known good 12 volt source, and if you STILL can't get the motor to spin then it's seized up or it's just a bad motor. If you have the motor removed, try spinning the squirrel cage by hand. Is it stiff? Seized? Probably need a new one if it doesn't spin freely by hand.

Hope this helps!

Nov 08, 2009 | 2003 Saab 9-3

1 Answer

A/c fan not working


on a right hand drive vehicle you will find the blower motor just under the cubbie hole.Slide the 2 levers and the cover comes off.Use a spline to remove the motor. You must change the brushes and please make sure the replacement brushes are of the same grain else you will damage the commutator

Sep 09, 2009 | 1996 Mercedes-Benz C-Class

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