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Discuss 97 Ford Ranger - Heat & AC Blower Fan stopped working? in the alt.autos.ford forum at Car Dealer Forums; Hello Ford Mechanics at large, I own a 97 Ford Ranger and about two weeks ...
  1. #1
    Laynester
    Guest

    Default 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    Hello Ford Mechanics at large,

    I own a 97 Ford Ranger and about two weeks ago the cab blower fan (for
    the Heat and A/C) started to intermittently fail. At that time when I
    started the truck, I would turn on the A/C, and noticed that the fan
    would "blast on" then turn off, then come back on, then off - next it
    just stopped. There are no whistles or whines coming from the fan
    (e.g. as if there was somthing stopping the fan blades).

    1st thing checked: All fuses are good - no burnt one's found.

    2nd thing checked: I purchased and replaced the inexpensive "fan
    resistor" switch module from the local Ford dealer here. Turned on
    truck, tested and it still fails - the fan resistor switch did not fix
    this.

    I know the AC is still working I can almost feel cold air coming out
    the vents as I cruise down the road, there is just no "fan power" to
    blow the air out.

    Is there a next good step I can try to isolate this issue? I'm fairly
    good with a electric DC Volt meter for a fuse box check or blower
    motor fan "plug going into the blower fan motor" electrical test.

    Any thoughts on a good next step check to fix this "no interior blower
    fan" condition?

    Best Regards,

    Laynester

  2. #2
    SC Tom
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?


    "Laynester" <brentrobertson@hotmail.com> wrote in message
    news:7b8fa2e7-b6e6-4d58-b80b-fcc0f90f9468@d77g2000hsb.googlegroups.com...
    > Hello Ford Mechanics at large,
    >
    > I own a 97 Ford Ranger and about two weeks ago the cab blower fan (for
    > the Heat and A/C) started to intermittently fail. At that time when I
    > started the truck, I would turn on the A/C, and noticed that the fan
    > would "blast on" then turn off, then come back on, then off - next it
    > just stopped. There are no whistles or whines coming from the fan
    > (e.g. as if there was somthing stopping the fan blades).
    >
    > 1st thing checked: All fuses are good - no burnt one's found.
    >
    > 2nd thing checked: I purchased and replaced the inexpensive "fan
    > resistor" switch module from the local Ford dealer here. Turned on
    > truck, tested and it still fails - the fan resistor switch did not fix
    > this.
    >
    > I know the AC is still working I can almost feel cold air coming out
    > the vents as I cruise down the road, there is just no "fan power" to
    > blow the air out.
    >
    > Is there a next good step I can try to isolate this issue? I'm fairly
    > good with a electric DC Volt meter for a fuse box check or blower
    > motor fan "plug going into the blower fan motor" electrical test.
    >
    > Any thoughts on a good next step check to fix this "no interior blower
    > fan" condition?
    >
    > Best Regards,
    >
    > Laynester


    Was it the switch or the resistor module that you replaced? I was thinking
    on the Rangers, the resistor pack was under the hood on the evaporator
    housing.

    It could be the fan itself that's gone on you. Mine went with virtually no
    warning on my Escape. One day it started slowing down, and by the end of the
    week, I had no fan at all. Didn't make any noise or anything, just died
    quietly.

    SC Tom



  3. #3
    Jeff
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    On Aug 25, 9:54*am, Laynester <brentrobert...@hotmail.com> wrote:
    > Hello Ford Mechanics at large,
    >
    > I own a 97 Ford Ranger and about two weeks ago the cab blower fan (for
    > the Heat and A/C) started to intermittently fail. At that time when I
    > started the truck, I would turn on the A/C, and noticed that the fan
    > would "blast on" then turn off, then come back on, then off - next it
    > just stopped. There are no whistles or whines coming from the fan
    > (e.g. as if there was somthing stopping the fan blades).
    >
    > 1st thing checked: All fuses are good - no burnt one's found.
    >
    > 2nd thing checked: I purchased and replaced the inexpensive "fan
    > resistor" switch module from the local Ford dealer here. Turned on
    > truck, tested and it still fails - the fan resistor switch did not fix
    > this.
    >
    > I know the AC is still working I can almost feel cold air coming out
    > the vents as I cruise down the road, there is just no "fan power" to
    > blow the air out.
    >
    > Is there a next good step I can try to isolate this issue? I'm fairly
    > good with a electric DC Volt meter for a fuse box check or blower
    > motor fan "plug going into the blower fan motor" electrical test.
    >
    > Any thoughts on a good next step check to fix this "no interior blower
    > fan" condition?
    >
    > Best Regards,
    >
    > Laynester


    I had a similar problem with my fan on my 97 Contour. I had the took
    it to the dealer because there was supposed to be a recall. The
    resistor was replaced as pat of the recall. THen, supposedly, the fan
    switch was bad. They replaced that at my expense (around $88) and it
    still didn't work. I tested the thing as I drove away from the dealer
    and the fan didn't work. I immediately returned the car and told them
    what the problem was. The shop manager let the mechanic know that he
    is supposed to test the stuff before returning the car. The dealer
    replaced the resistor for free, then. Had the guy tested the switch,
    they would have tried to nail me for another resistor. As it was, I
    wonder if the fan switch was ever bad.

    Anyway, there are only about three or four points of failure - the
    switch on the dash, the resistor, the grounding of the motor and the
    wiring going to the switch and resistor.

    Jeff

  4. #4
    Bruce L. Bergman
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    On Mon, 25 Aug 2008 19:02:36 -0700 (PDT), Jeff wrote:
    >On Aug 25, 9:54*am, Laynester <brentrobert...@hotmail.com> wrote:


    >> I own a 97 Ford Ranger and about two weeks ago the cab blower fan (for
    >> the Heat and A/C) started to intermittently fail. At that time when I
    >> started the truck, I would turn on the A/C, and noticed that the fan
    >> would "blast on" then turn off, then come back on, then off - next it
    >> just stopped. There are no whistles or whines coming from the fan
    >> (e.g. as if there was somthing stopping the fan blades).
    >>
    >> 1st thing checked: All fuses are good - no burnt one's found.
    >>
    >> 2nd thing checked: I purchased and replaced the inexpensive "fan
    >> resistor" switch module from the local Ford dealer here. Turned on
    >> truck, tested and it still fails - the fan resistor switch did not fix
    >> this.
    >>
    >> I know the AC is still working I can almost feel cold air coming out
    >> the vents as I cruise down the road, there is just no "fan power" to
    >> blow the air out.
    >>
    >> Is there a next good step I can try to isolate this issue? I'm fairly
    >> good with a electric DC Volt meter for a fuse box check or blower
    >> motor fan "plug going into the blower fan motor" electrical test.


    Start at the fuse block and see where the voltage is getting. And
    if you get voltage all the way to the motor, check the ground.

    The resistor pack is the Usual Suspect, but you still always check
    things first before just throwing parts at the problem - the
    resistance is very low but measurable through the pack, in the one to
    three ohm range - but they usually fail open which is rather obvious.

    >I had a similar problem with my fan on my 97 Contour. I had the took
    >it to the dealer because there was supposed to be a recall. The
    >resistor was replaced as pat of the recall. THen, supposedly, the fan
    >switch was bad. They replaced that at my expense (around $88) and it
    >still didn't work. I tested the thing as I drove away from the dealer
    >and the fan didn't work. I immediately returned the car and told them
    >what the problem was. The shop manager let the mechanic know that he
    >is supposed to test the stuff before returning the car. The dealer
    >replaced the resistor for free, then. Had the guy tested the switch,
    >they would have tried to nail me for another resistor. As it was, I
    >wonder if the fan switch was ever bad.
    >
    >Anyway, there are only about three or four points of failure - the
    >switch on the dash, the resistor, the grounding of the motor and the
    >wiring going to the switch and resistor.


    The motor itself does fail from worn brushes, open windings or
    seized bearings. And they get mechanically blocked with leaves and
    debris in the housing,. or wrapped around the motor shaft under the
    fan wheel - you have to take the fan out and check for these problems.

    Unplug the motor from the harness and attach a 'killer cord'
    straight to the battery with a 10A fuse and an ammeter. Run it
    outside the car and see what happens - NOT from the car fan circuit,
    or you'll cook the resistor pack with no air flow over it.

    Find the rated fan motor current draw in the service manual for your
    car, and make sure you are in the right neighborhood - if the bearings
    are going bad the motor running current will be high.

    The heater fan usually runs from an Accessory Circuit relay
    controlled by the ignition switch, or a set of ignition switch
    contacts directly, but when they go bad usually lots of things die at
    once and not just the heater blower.

    This should get you closer.

    --<< Bruce >>--


  5. #5
    Laynester
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    > * This should get you closer.
    >
    > * --<< Bruce >>--- Hide quoted text -
    >


    To the group above, excellent info - I'm going to start working and
    troubleshooting this again on this in about 2 weeks due to having to
    leave town.

    Bruce very helpful info m'man. Especially running the a power lead to
    the motor to see if that's blown + check groundings. Keep you all
    posted in a couple of weeks on this one.

    Laynester


  6. #6
    Ricky Forrest
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    Laynester wrote:
    >> This should get you closer.
    >>
    >> --<< Bruce >>--- Hide quoted text -
    >>

    >
    >
    > To the group above, excellent info - I'm going to start working and
    > troubleshooting this again on this in about 2 weeks due to having to
    > leave town.
    >
    > Bruce very helpful info m'man. Especially running the a power lead to
    > the motor to see if that's blown + check groundings. Keep you all
    > posted in a couple of weeks on this one.
    >
    > Laynester
    >

    My last experience with a T-Bird, was the connector from the fan to the
    relay, got old, loose and was making an over-amp condition, it fried the
    connector, with intermittent connect, disconnect issues, I just cut the
    connector out, and spliced it with a butt connector. Works awesome now.

  7. #7
    Ricky Forrest
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    Laynester wrote:
    >> This should get you closer.
    >>
    >> --<< Bruce >>--- Hide quoted text -
    >>

    >
    >
    > To the group above, excellent info - I'm going to start working and
    > troubleshooting this again on this in about 2 weeks due to having to
    > leave town.
    >
    > Bruce very helpful info m'man. Especially running the a power lead to
    > the motor to see if that's blown + check groundings. Keep you all
    > posted in a couple of weeks on this one.
    >
    > Laynester
    >

    My last experience with a T-Bird, was the connector from the fan to the
    relay, got old, loose and was making an over-amp condition, it fried the
    connector, with intermittent connect, disconnect issues, I just cut the
    connector out, and spliced it with a butt connector. Works awesome now.

  8. #8
    Bruce L. Bergman
    Guest

    Default Re: 97 Ford Ranger - Heat & AC Blower Fan stopped working?

    On Sun, 07 Sep 2008 12:12:50 -0500, Ricky Forrest
    <rickyforrest@sbcglobal.net> wrote:

    >Laynester wrote:
    >>> This should get you closer.
    >>>
    >>> --<< Bruce >>--- Hide quoted text -
    >>>

    >>
    >>
    >> To the group above, excellent info - I'm going to start working and
    >> troubleshooting this again on this in about 2 weeks due to having to
    >> leave town.
    >>
    >> Bruce very helpful info m'man. Especially running the a power lead to
    >> the motor to see if that's blown + check groundings. Keep you all
    >> posted in a couple of weeks on this one.
    >>
    >> Laynester
    >>

    >My last experience with a T-Bird, was the connector from the fan to the
    >relay, got old, loose and was making an over-amp condition, it fried the
    >connector, with intermittent connect, disconnect issues, I just cut the
    >connector out, and spliced it with a butt connector. Works awesome now.


    If it's inline connectors, they often have to be opened to remove
    and replace the motor - Better to cut it out and use .250 male tab and
    female tab Nylon shrouded connectors. Because then you can pull out
    the motor,replace it, etc.

    If there is a bad connector body on the cable plugged into a
    hard-mounted socket on the motor, snip off the bad connector body and
    get a 'repair connector' at the Parts Store.

    Butt splices will work, but every time you cut the wire and resplice
    it you lose another 1/4" on each end - 1/2" at a minimum, 1" if you
    aren't being careful to snip right at the base of the barrel. And it
    doesn't take long at all before you run out of slack in the wire.

    The round "Bullet" connectors get loose over time, the .250 wide tab
    is a much more reliable connection.

    --<< Bruce >>--


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