Question about 1992 Mercedes-Benz Mercedes Benz 300 Class

2 Answers

I removed the heater control from the dash in my 1990 sl300 and now the heater/blower will not work, I have power to it as the recirculation switch lights up when selected.

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  • johnandcrew Jun 23, 2009

    The control unit has been put back in the vehicle and it was then that I discovered that it will not work, when I try to use it I can hear relays clicking but nothing happens

  • Ned C Cook
    Ned C Cook May 11, 2010

    if you hear relays then it is working, right?

  • Ned C Cook
    Ned C Cook May 11, 2010

    but, are the blower wires connected?

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You have primary control of the relay so the control is working. What you don't have is the secondary voltage to cause function. The relay works but the function of the secondary does not. Look for a blown fuse for the secondary circuit of the relay.(s) or the componant that is supposed to function is defective, but, the control is working. Good luck, ned

Posted on Jun 23, 2009

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The blower should work! check the motor wiring circuit. forget about the heater because you removed it!

Posted on Jun 23, 2009

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1 Answer

How to disconect the control cables on 1997 geo metro heater control?


does the fan work on high.
yes, then the heater resistor block is burned up. replace that
or look at it to see if the coil there are burned up and gone.
please post systems first, then your guess.
the FSM covers all this, step by step, take apart dash. under
HVAC chapter,.
alldata.com log in and its there.
factory service manual.
removing the control is tricky on all cable cars.
you must get the cables loose before the panel can move out.
the cables all clamped down or they will be dead. (all cars with cables drive)
please post of HIGH speed blower works on high first.
why do this the hard way, at the worst we can use a voltmeter
and prove what is dead, first.

see those rules on cables in the FSM below?
ill not post the panel Remove
  1. Disconnect the negative battery cable.
  2. Remove the heater control unit from the instrument panel.
  3. Remove the mode and temperature control cables at the heater case. Remove the cables from the vehicle.
  4. Remove the fresh/recirculate control cable at blower case and remove from vehicle.
  5. Installation is the reverse of removal.
  6. Adjust the cables prior to attaching at heater control unit.

now lets look at the blower, dead, on all speeds but HIGH , i bet.
?????????????????
this is your cave man simple blower
so if FUSE marked HTR is good, and 12vdc is on both sides of
fuse keyon, then it is good,. and 12vdc lands on motor top
where below on HIGH the blower and switch works on high.
if say the right side resistor blows up, (as all do)
then all lower speed fail. and DC power fails to reach the fan motor.
how is that? clear>?

25490481-331th0o4ygoodik5f23zyrbq-3-0.jpg

Feb 27, 2015 | 1997 Geo Metro

2 Answers

I have a 1990 sundance my backup lights and heater blower doesnt work. when i put the car in reverse the brake light and airbag light comes on and when i try the heater blower it does the same so if any...


no back up lights mean back up reverse neutral switch is bad.use a 12 volt test light see if power going to blower motor or remove blower motor hot wire blower motor see if it works if not blower motor need replacing.if blower works when hot wired it.problem could be in ac and heater control switch faulty also resistor or check blower make sure it getting good ground.you could have poor ground at blower motor or electrical wiring going to blower motor could have a short or open.

Nov 23, 2011 | 1990 Plymouth Sundance

3 Answers

My fan blower motor only works on high,They say it maybe the resistor may be bad, where is it ? Thanks, Jim


Hi, the resistor is screwed to the side of the blower housing behind the glove box. See procedure below to replace the resistor. You don't have to complete all steps in the procedure. just work your way to the point that you can unscrew the resistor. Please let me know if you have questions, and thanks for using FixYa.

1990-93 Accord

See Figures 2, 3 and 4
  1. Disconnect the negative battery cable. If so equipped, disable the Supplemental Restraint System (SRS).
  2. Remove the glove box.
  3. Remove the glove box frame (lower support)

jturcotte_1481.gif

Fig. Fig. 2: Remove the glove box and frame

  1. If not equipped with air conditioning:
    1. Remove the three screws and remove the heater duct.
    2. Remove the blower mounting nuts. Unplug the wiring from the blower motor, resistor and recirculation control motor, then remove the blower assembly.

  2. If equipped with air conditioning:
    1. Lift the carpet in the passenger compartment. Remove the side cover (kick panel).
    2. Remove the control unit bracket nuts; unplug the five connectors and remove the control unit bracket.
    3. Remove the retaining band, then remove the blower lower covers. Do not break the tabs on the lower covers.
    4. Remove the retaining nuts and remove the blower assembly.
jturcotte_1482.gif

Fig. Fig. 3: Air conditioned models require the removal of the control unit. Handle it carefully


jturcotte_1483.gifjturcotte_418.jpg

Apr 04, 2011 | 1993 Honda Accord

2 Answers

I cant find the blower motor


If you mean the climate control blower motor, it's usually under the dash on the passenger side on Hondas.

1990-93 Accord
  1. Disconnect the negative battery cable. If so equipped, disable the Supplemental Restraint System (SRS).
  2. Remove the glove box.
  3. Remove the glove box frame (lower support) Fig. 2: Remove the glove box and frame 86806004.gif

  4. If not equipped with air conditioning:
    1. Remove the three screws and remove the heater duct.
    2. Remove the blower mounting nuts. Unplug the wiring from the blower motor, resistor and recirculation control motor, then remove the blower assembly.
  5. If equipped with air conditioning:
    1. Lift the carpet in the passenger compartment. Remove the side cover (kick panel).
    2. Remove the control unit bracket nuts; unplug the five connectors and remove the control unit bracket.
    3. Remove the retaining band, then remove the blower lower covers. Do not break the tabs on the lower covers.
    4. Remove the retaining nuts and remove the blower assembly. Fig. 3: Air conditioned models require the removal of the control unit. Handle it carefully 86806005.gif
      Fig. 4: Remove the lower covers from the blower unit 86806006.gif
      To install:
  6. Install the blower unit and tighten the retaining nuts.
  7. On air conditioned vehicles:
    1. Install the lower covers and the retaining band.
    2. Install the control unit bracket and carefully engage the wiring connectors to their proper location.
    3. Install the kick panel and reposition the carpet.
  8. Connect the wiring to the blower assembly. For non-air conditioned vehicles, install the air duct and tighten the screws.
  9. Install the glove box frame and install the glove box. Note that some of trim on the frame is held with 2-sided tape; replace the tape when reassembling as necessary.
  10. If applicable, enable the SRS.
  11. Connect the negative battery cable.
1988-91 Prelude
  1. Disconnect the negative battery cable.
  2. Remove the glove box and frame (lower support).
  3. Remove the 4 screws and remove the heater duct. Fig. 5: The glove box and frame are secured by several small screws 86806007.gif

  4. Remove the 3 mounting bolts.
  5. Unplug the wiring connectors from the blower motor, resistor and recirculation controller. Remove the blower motor assembly.
  6. Reinstall in reverse order. Make certain the blower mating surfaces are tightly sealed.

Jan 08, 2011 | 1992 Honda Accord

1 Answer

99 olds heater heats,but doesnt come on


CHECK HEATER AND AC IGNITION 10 AMP FUSE UNDER HOOD JUNCTION BOX.IF ALL IS GOOD CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL LOOKS GOOD. TURN ON CONTROL SWITCH TO CHECK TO SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR FUSE AND RELAY GOOD.YOU HAVE BROKE WIRE BETWEEN SWITCH AND BLOWER MOTOR OR CONTROL SWITCH FAULTY. TO GET TO BLOWER MOTOR ITS LOCATED UNDER THE DASH ON PASSENGER BEHIND GLOVE COMPARTMONT YOU DONT HAVE TO REMOVE GLOVE BOX ITS JUST BELOW IT FAR BACK.YOU NEED TURN OFF RADIO FIRST THEN DISCONNECT NEGATIVE BATTERY CABLE WAIT 20 MINUTES THIS DISABLE AIRBAGS AND THE BCM.REMOVE BLOWER MOTOR HOTWIRE IT TO SEE IF ITS WORKS. IF NO BLOWER MOTOR NO GOOD.IF BLOWER MOTOR GOOD THE AC AND HTR CONTROL SWITCH IS BAD DEALERSHIP FIX.

Dec 30, 2010 | 1999 Oldsmobile Alero

1 Answer

Mercedes blower motor.


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

Apr 22, 2010 | 1990 Mercedes-Benz 300 Diesel

1 Answer

Aircondition blows hot air on normal but blows cold air on max


The temp blend door rotates between allowing heat through the heater core, or cold air through the a/cevaporator, or a blending of the 2 by being anywhere between the two.

I would check the heater a/c control head first and hope it's just the control head.
----------------
here is a descripton of the system.

Section 12-03A: Air Conditioning, Heater System, Manual, Ranger and Explorer 1996 Ranger and Explorer Workshop Manual
DESCRIPTION AND OPERATION A/C-Heater System, Manual The manual air conditioning/heater system used in these vehicles is a split-case, blend air design. This design includes the following major components:
  • An A/C evaporator housing (19850) which is attached to the engine compartment side of the dash panel (01610). This assembly includes: (1) the A/C evaporator core (19860), (2) the suction accumulator/drier (19C836), (3) the A/C cycling switch (19E561), (4) an internal, A/C evaporator core orifice (19D990) located inside the inlet line to the A/C evaporator core, (5) a blower motor (18527), (6) a blower motor wheel (18504), (7) a heater blower motor switch resistor (18591), and (8) the A/C evaporator case (19897).
  • A heater air plenum chamber (18471) which attaches to the passenger compartment side of the dash panel. This assembly includes: (1) the outside/recirculating air inlet door, (2) the panel door, (3) the floor defrost door, (4) the temperature blend door, and (5) the heater core (18476).
  • Other components which link and/or control the heating and air conditioning systems include: (1) the A/C control (19980), (2) the ducts and registers, (3) the windshield defroster hose nozzle (18490), (4) the control cables, (5) the vacuum lines, (6) the refrigerant tubes and hoses, (7) the A/C compressor (19703), and (8) the A/C condenser core (19712).
050240f.gif
The A/C control (19980) assembly consists of three main parts:
  • The function selector knob, a vacuum selector valve combined with an internal electrical switch.
  • Heater blower motor switch (18578), an electrical switch that provides four speeds of A/C blower motor operation.
  • A temperature control knob, which controls the position of the temperature blend door mounted on A/C evaporator housing (19850) assembly.
---------------------------
Temperature Control
The temperature selector actuates a variable resistance switch. This switch varies the voltage to an electric actuator used to position the temperature blend door. Positioning the temperature control in any position between COOL and WARM causes the temperature blend door to direct more or less outside air through or around the heater core (18476) for whatever proportion of heated or unheated outside air is desired. The air blends together as it leaves the heater core and enters the heater air plenum chamber (18471) for distribution.
---------------------------
System Airflow Description Air is drawn into the system by the blower motor (18527) through the outside-recirc. door opening. The air is blown through the A/C evaporator core (19860) and then the heater core (18476) (when the temperature control is moved toward the WARM position). When the temperature blend door is in the maximum COOL position, the air bypasses the heater core. When the temperature control is moved to the right, away from the maximum COOL position, air passes through the heater core where it is warmed, and then mixed with the cool air before it is discharged through the registers. OFF
With the function selector in the OFF position, the outside-recirc. door is in the recirculated air position. It is closed to outside air and no air passes through the system. The blower motor is off. MAX A/C
NOTE: No temperature modulation is possible in the MAX A/C position.

In the MAX A/C position, the outside-recirc. air door is in the recirculated air position. All of the air discharges through the panel registers except for a small amount of floor bleed. The A/C compressor (19703) operates in this function control setting.
--------------------------------
You have to almost remove the dash to get this part out.
Removal
  1. Disconnect battery ground cable.
  1. NOTE: Refer to Section 01-12 for instrument panel removal and installation procedure.

    Loosen instrument panel (04320) and pull back from cowl.
  1. Remove A/C electronic door actuator motor electrical connector from bracket on A/C evaporator housing.
  1. Remove three A/C electronic door actuator motor retaining screws.
  1. NOTE: The mounting bracket remains in place on the A/C evaporator housing.

    Lift A/C electronic door actuator motor vertically approximately 12mm (1/2 inch) to disengage it from bracket and actuator shaft, then pull A/C electronic door actuator motor back toward passenger compartment.
82a7359.gif

Apr 25, 2009 | 1996 Ford Explorer

1 Answer

How do i pull out a faulty heater blower motor from behind glovebox in 91 accord?


For Pictured Detailed Innstruction see Bottom of Page


BLOWER UNIT REMOVAL
  1. Remove the glove box.
2. Remove Glove box FRAME
3. Pull back the carpet and remove the kick panel. Remove the control unit bracket mounting nuts (4). Disconnect the connectors (5) and remove the control unit and bracket.

  1. Without A/C:
    • Remove the self-tapping screws (3) and remove the heater duct.
    • Remove the blower (3 nuts).
  • If the car has A/C, remove the blower unit according to the sequence shown
  • BLOWER MOTOR REPLACEMENT
    Refer to illustration for blower unit disassembly and reassembly, noting the following:
    • Before reassembly, make sure that the air door and linkage moves smoothly without binding.
    • When reattaching the recirculation control motor, make sure its positioning will not allow the air door to be pulled too far. Attach the recirculation control motor and all linkage, then apply battery voltage and watch the recirculation control door movement. If necessary, loosen the holding screw and move the recirculation control motor up or down
    • CONTROL ROD ADJUSTMENT
      Connect the recirculation control motor connector to the main wire harness and turn the FRE/REC switch to "REC". Hold the air door closed, then connect the control rod to the clip on the arm.
    • Email Me at the nickkname shown here >>rejakwilson @aol.com

Jan 18, 2009 | 1991 Honda Accord

1 Answer

1990 Toyota 4x4 heater resister location?


As it turns out, the dealership sent me the wrong part so there is no wonder why I couldn't find it.D'oh! They sent me the heater relay switch by mistake and of course they look nothing alike.I would like thank you for your help and will remove the post so as not to cause any grief for anyone.Thanks again.

Jan 07, 2009 | 1990 Toyota Pickup

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