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I need a diagram for a heater - blower motor resistor on a 1998 buick century custom

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  • Raymond Nicholson Sep 07, 2010

    After having removed the heater - blower motor resistor - I am not sure if there was 1 or 2 sets of wires that attach to the "Blower Motor Resistor"? Please help - on the new blower motor resistor there is a small 2 wire connector, but then there is a long terminal with 6 or 7 pins inside of it, and thats the one I'm not sure of and if I disconnected anything from or not?



    Thank You - Ray

  • Raymond Nicholson Sep 08, 2010

    I'm at a loss for this other wire (multi - pin) connector, so tomorrow I will have to get back under the dashboard to see if I missed / misplaced something (probable cause - I was working tired and not thinking clearly). Thanks again - RAY

    PS: I will keep you advised!

  • Raymond Nicholson Sep 08, 2010

    Can just the 2 wire plug-in connector wire make the blower motor resistor functional (speed switch to be able to select different speeds from low to high)? Next question - is there another wire connector that has to be plugged in to the resistor to make it work? Thank You - RAY

    Please note: I am not your everyday mechanic - sort of a do-it-yourself type.

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  • Buick Master
  • 17,970 Answers

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.Battery voltage to the blower motor is supplied by the heater & A/C control by way of the blower resistor (or blower motor control module). At low and medium speeds, the voltage is stepped down by the blower motor resistors. At high speed, the blower motor relay is energized, removing the blower motor resistors from the circuit. Battery voltage is then applied directly to the blower motor through the relay. The motor will then run at maximum speed.

Several types of HVAC systems were available on these vehicles, from manual to fully automatic electronic control. The blower motor speed can be adjusted manually by pushing the fan switch up or down or automatically by placing the heater & A/C control in the AUTO mode.

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.

I need a diagram for - 68f54ca.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

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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.

The blower motor resistor is located on the back of the blower motor housing under the dash on the passenger side. It can be difficult to get at, but it is doable. Be ready with the ibuprofen the next day for your sore back.
Remove the cover panel from beneath the dash on the passenger side.
Unplug the power 'ribbon' wires leading to the resitor.
Unplug the wires that lead from the resitor to the blower motor housing. There are usually two, one black and one purple that share the same plug.
Remove the short hose that leads from the blower motor housing to the ventilation system ducts.
Remove the blower motor by removing the three hex screws that hold it in place.
Remove the resistor by removing the three hex screws that hold it in place. The resistor is right against the firewall so two of the screws are very difficult to reach. A slender flexible socket extension will make the job easier.
Attach the new resistor in place using the same hex screws. Only 1 or 2 of the original three are needed (the part is very light) if you do not feel like fighting with the ones next to the firewall.
Reatach the blower motor and reconnect the hose.
Plug the power cable wires back into the resitor and the wire from the resistor back into the blower motor.

Instead of hex screws mine were held in with 7/32 bolts. It was difficult, but easier than I had anticipated. I replaced two of the three bolts holding the resistor. The blower motor came with instructions saying that the plugs may have to be cut off of the resistor and the blower motor, then spliced together... I had to do this on mine.
I got everything back together and now the fan works on four of the five levels. It does not work on high.

I found on another site that said "high" uses a different circuit, with a separate fuse. I found the fuse panel on the passenger side of the dash when the door is open. The cover for the panel has all of the fuses mapped out, so it was easy to spot the 25 amp "Blower High Speed" fuse. I was very impressed to find the panel contained a fuse puller and replacement fuses. Mine was blown, I replaced it, and all is good with the world.

Hope helps.

Posted on Sep 08, 2010

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  • Master
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I need a diagram for - 345c0ab.jpg

This will help you out.

Posted on Sep 08, 2010

  • Jason Maurirere
    Jason Maurirere Sep 08, 2010

    This may help you out then.



    Let me know if you need more information.

    Thanks
    jason

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  • Master
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I need a diagram for - 4d0afe9.gifDoes this help?

Posted on Sep 07, 2010

  • Nate Stansfield
    Nate Stansfield Sep 07, 2010

    Two wire for power and a bigger pin set for selector and speed.

  • Nate Stansfield
    Nate Stansfield Sep 08, 2010



  • Locate
    the blower motor and look around the outside and close to the motor for
    a 2-by-3-inch plate held on by two or four small screws. There will be
    an electrical connector plugged into it with five or six wires,
    depending on the type of heating and air conditioning of control panel.





  • 2

    Test the resistor before replacing it. It is always
    recommended to test any electronic unit before replacing because there
    are a multitude of things that could cause the same symptoms. It only
    takes a few minutes and can qualify the assumption that a part is bad.
    It will save money to replace or repair the right part the first time.





  • 3

    Check the speeds by turning the fan conrol to all positions. Take note which fan speeds work and which speeds do not work. If the fan works only on one speed the blower motor resistor is very likely bad.





  • 4

    Check the fuses if the fan speeds do not work. The fuses for
    the interior heating and air conditioning fan are usually under the hood
    in the fuse and relay center. If the fuse looks good,
    then take it out and turn the ignition key on and use the volt meter
    set at 20 volts DC. Check to make sure that there is voltage to the
    fuse. If not, check for an open circuit to the fuse.





  • 5

    Check the relay to determine if there is power at the fuse.
    The relay should have two of the four terminals showing power. With the
    key on and the fan turned on, remove the relay and put it back in,
    listening for it to click. If it does not click, then replace the relay.





  • 6

    Check the voltage at the electrical connector on the blower
    motor resistor to see if the fuse and relay are good. Make sure that
    power is present at the connector with the key on and the fan switch on.
    There should be power at two terminals of the blower motor resistor. If
    only one terminal has power, replace the resistor. If two terminals
    have power, replace the blower motor itself. Remove the screws and
    unplug the connector to remove the blower motor resistor. Put the new
    one in its place by screwing it back in and plugging in the wiring
    connector.


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