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Thread: Blower Motor Problems - Testing/diagnosis

  1. #16
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    you can buy a cheapy one at autozone and try it out... like i said the harness is 2 foot long. Just to test it and say you never used it and buy a ford part.

    The bcm is common to fail.

    As Macdombles said, there is a manual controller bcm and a digital display controller bcm... Order the digital display one (obviously)

    Actually having the new BCM in hand will help you figure out how to unplug the sucker, its awkward back there.
    Hope your not a lefty.
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  2. #17
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    This module is kind of hard to get to. And if you do buy a module that you plan to use and keep, please do not test the blower speeds for very long with the module out as the reason it is mounted where it is, is because they are resistors, they get very hot. There in the blower ducting to cool them as they work. They go bad often so it's obvious they barely keep cool enough to make it out of warranty. If you use any speeds other than high you will smoke this module in seconds not to mention it will burn you if you hold it while it's on.
    And if you do buy a cheap one to take back after you test it, keep in mind the next guy will have either a bad, or severely damaged new out of the box.

  3. #18
    FWIW,
    I have over 16 years experience (part time positions) in auto parts sales. Please keep in mind, most parts stores will inform you that if you buy an electrical part and connect it, whether it is a battery or a switch, the part is yours. If it is an item that carries a warranty, I will warranty it out with a new part but the store will not give you cash back on an obviously installed item. Most parts men (or ladies) will examine the contacts for scratches that indicate the part has been connected.
    Don't mean to dampen anyone's attempts to repair their vehicle, but don't be surprised if you encounter resistance to return an obviously installed electrical part.

  4. #19
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    Not to derail the thread....but resistance/heat sink 'technology' is still being used to control electric motor speeds....???
    I think that Edison invented it 100 years ago!

    Hasn't any OEM heard of PWM for motor control?
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  5. #20
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    I feel the same way about thermostats

  6. #21
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    I've had my BCM strapped to the main ac line for 2 years and it's not smoked..

    I assume ours IS pwm
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  7. #22
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    Quote Originally Posted by Turbov6Bryan View Post
    I've had my BCM strapped to the main ac line for 2 years and it's not smoked..

    I assume ours IS pwm
    The auto climate ones aren't the old resistor ones. They don't produce the heat as the others.
    Id like to see a brushless motor with a 40 amp esc from the rc world. It would be an easy swap!

  8. #23
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    Just to be pedantic, because my father was an English teacher, it's not a resistor. I know, I know...a lot of the parts books and sites call it that, but just because they're ignorant, there's no reason we have to be.

    It's called a BMSC- Blower Motor Speed Controller module. It works by creating a PWM (Pulse-Width Modulation) signal just like a high-end model train controller, which switches the ground side of the circuit. The EATC sends a signal of 1 to 2 volts to the BMSC which translates that to variable speeds of the blower motor. There is also a relay that bypasses the PWM circuit and connects the blower motor directly to ground, to produce the highest speed.

    The resistor pack which is used with manual HVAC controls is exactly that...a circuit with 3 small coils of resistance wire, like in a toaster, that are switched in various combinations to lower the voltage at the blower motor. The high position just bypasses all the coils.
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  9. #24
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    Quote Originally Posted by RF Overlord View Post
    Just to be pedantic, because my father was an English teacher, it's not a resistor. I know, I know...a lot of the parts books and sites call it that, but just because they're ignorant, there's no reason we have to be.

    It's called a BMSC- Blower Motor Speed Controller module. It works by creating a PWM (Pulse-Width Modulation) signal just like a high-end model train controller, which switches the ground side of the circuit. The EATC sends a signal of 1 to 2 volts to the BMSC which translates that to variable speeds of the blower motor. There is also a relay that bypasses the PWM circuit and connects the blower motor directly to ground, to produce the highest speed.

    The resistor pack which is used with manual HVAC controls is exactly that...a circuit with 3 small coils of resistance wire, like in a toaster, that are switched in various combinations to lower the voltage at the blower motor. The high position just bypasses all the coils.

    Yep. Spot on with that info. Couldn't count the number of those old BSC units I've replaced in a couple past lives.

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  10. #25
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    Quote Originally Posted by MyBlackBeasts View Post
    Yep. Spot on with that info. Couldn't count the number of those old BSC units I've replaced in a couple past lives.
    What's even funnier is when you're 15 years old and you don't know how that stuff works and you wonder why your fan speed doesn't work so you take the resister pack out and you grab the wires that were just being used and you touch the coil and burned the ever living **** out of your fingers. I may know somebody that did that.
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  11. #26
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    Quote Originally Posted by Turbov6Bryan View Post
    What's even funnier is when you're 15 years old and you don't know how that stuff works and you wonder why your fan speed doesn't work so you take the resister pack out and you grab the wires that were just being used and you touch the coil and burned the ever living **** out of your fingers. I may know somebody that did that.






    Yes, we all have those learning experiences.


    It's OK too, if you learn from it but if you do it a 2nd time, well then...

    WLB
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    ______________________________ ___________

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  12. #27
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    I’ll try just about anything three times.



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  13. #28
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    Quote Originally Posted by justbob View Post
    I’ll try just about anything three times.



    Sent from my iPhone using Tapatalk Pro



    Well if you did this 3 times it would have to be the masochist in you coming out!

    WLB
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    ______________________________ ___________

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    Conceived 8/6/2002
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    Gorilla Nuts - The System
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  14. #29
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    Update: It was the Blower Control Module

    What a pain in the butt to get out. dropped one of the screws and still haven't found it.

    Had to take off the heater core hoses.

    Another Note: The heat shielding on the blower box was disintegrated. I bought some of the stick on heat shield from Advanced Auto. Will try to get that on there tomorrow.
    Last edited by Greg; 02-03-2019 at 06:38 PM.

  15. #30
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    Quote Originally Posted by Greg View Post
    Update: It was the Blower Control Module

    What a pain in the but to get out. dropped one of the screes and still haven'y found it.

    Had to take off the heater core hoses.

    Another Note: The heat shielding on the blower box was is disintegrated. I bout some of the stick on heat shield from Advanced Auto. Will try to get that on there tomorrow.


    I removed all of mine years ago and it still freezes me out of the car.


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

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