'96 T&C front AC blower not working properly

Discussion in 'General Motoring' started by Fieronut, Oct 24, 2005.

  1. Fieronut

    Fieronut Guest

    A few months ago, I wrote about a problem I had with the front AC/Heater
    blower on my '96 LXi. I never actually fixed it, just ran a hot wire to
    the blower motor and used it that way. The dealer had told me that it
    needed a relay but changed that and did nothing. (Very hard to GET to the
    relay, by the way!) I had gotten some advice from one of the NG member
    concerning a new resistor block and some wiring that goes with it. When I
    went to the dealer to get the block $15, I was told I didn't need the
    wiring, since the block had not changed. When I got home, noticed that
    the plug that goes into the block seemed discolored (from heat, I thot) at
    the tan/white wire. I cleaned the connectors, then checked for current at
    the plug. I had the ignition turned on and tried EVERY setting on the
    HVAC panel. There was NOTHING from ANY of the wires, no matter which one
    I checked. I changed the motor (it had begun to rattle from running on
    high all the time) and found that it would run WITHOUT the resistor block
    connected to anything...in other words, I removed the plug that plugs into
    the resistor and the motor still ran, but only on high. And when I plugged
    it in, it still ran but only on high. Obviously, there is a problem
    SOMEWHERE but since I've changed the relay, resistor block and motor, what
    else could it be? Looking at the schematic on page 8W-42-5 of the BIIIG
    manual, it appears that the relay must be working otherwise the motor
    wouldn't run at all. (I've disconnected the wire I ran directly to the
    motor.) But why doesn't it run on any other speed? Is it the HVAC panel?
    SOMETHING else? As you can tell, I'm mystified and winter is coming
    on...don't want to have to replace anything when it's below zero. HELP!!!
    tia...

    John
     
    Fieronut, Oct 24, 2005
    #1
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  2. Fieronut

    maxpower Guest

    Hmm, confusing... If you have 12 volts at the green wire at the blower motor
    everyhting is good to that point, test out the black wire coming out of the
    blower motor key on (ground) and see if the test lite is lites. If it does,
    you are missing a ground, more then likely that ground is open in the
    control head.

    Glenn Beasley
    Chrysler Tech
     
    maxpower, Oct 24, 2005
    #2
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  3. Fieronut

    philthy Guest

    and thru the resistor block
    he did state there were discolored
     
    philthy, Oct 27, 2005
    #3
  4. Fieronut

    Ken Weitzel Guest

    Hi John...

    Can't offer much but a previous experience, but others here have
    been helpful to me as I make the change from a lifetime of GM to
    my first Chrysler, so...

    Had a Buick wagon, with GM's climate control (temp AND fan speed auto)
    Suddenly stopped running on high, either auto or manual. No good in
    40 below weather for warming up unattended :(

    Turned out that the high speed was a totally separate feed, in fact
    an extra fuse (inline, in the engine compartment near the blower motor)

    Suspect that the highest speed drew more current than the wiring to
    the speed control switch could handle.

    Perhaps Chrysler does the same, and you're suffering the reverse of
    what I did? (no 12v through the "normal" channel?)

    Take care.

    Ken
     
    Ken Weitzel, Oct 27, 2005
    #4
  5. Fieronut

    Fieronut Guest

    Hmm, confusing... If you have 12 volts at the green wire at the blower
    motor everyhting is good to that point, test out the black wire coming out
    of the blower motor key on (ground) and see if the test lite is lites. If
    it does, you are missing a ground, more then likely that ground is open in
    the control head.
    Sorry, I have no idea what a "control head" is. And I THINK I have power
    to the blue (not green) wire at the motor because the motor runs. As to a
    ground, if the motor runs, I would think the black wire (the black wire is
    the only wire beside the blue one, going to the motor) must be grounded to
    SOMETHING....the problem is that the motor runs even when the resistor
    block is disconnected...which seems to mean that it is getting juice from
    somewhere OTHER than the resistor. Does that mean it is NOT getting
    power thru the HVAC panel but directly from the igntion switch? As I
    said, I tested EVERY wire going to the resistor block and NONE of them had
    any power going to them. (I tested them by turning on the ignition and
    checking EVERY wire in the connector with a volt meter, in EVERY speed at
    the HVAC panel) Doesn't that mean that SOMEWHERE there is an open? Maybe
    in the HVAC panel or before it? I'm really mystified.

    Again, tia.
    John
     
    Fieronut, Oct 29, 2005
    #5
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