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Thread: 99 A4 - Fresh Air Blower Not Working

  1. #11
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    Quote Originally Posted by DeeInSeatown View Post
    You can't actually get to the leads without removing the housing. I could bolt it back in and run leads out.

    Anyhow I did hook it up to 12v today by way of my motorcycle's battery tender pigtail. Motor turned, until the 7.5 amp fuse on the pigtail blew. So I know it turns, just didn't get to full speed before the fuse blew to know if it's making noise.
    Wondering, what is normal amp draw for this, would not think a lot more than 7.5???

    lARIMORE

  2. #12
    NostraJackAss Jack@European_Parts's Avatar
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    Larrymore

    It's in the RTFB just like the sauce.........

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  3. #13
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    Quote Originally Posted by Larry Manton View Post
    Wow a forum where people are actually active and responsive.

    Jack, laughing now, if he only knew, makes my morning. Are regular ones round or irregular ones some other shape???

    Larimore
    Oh, I did my due diligence before posting. It's hard to read threads here and not get a sense of the players, or should I say jokers, on the stage.

    Wondering, what is normal amp draw for this, would not think a lot more than 7.5???
    I can't completely answer that question, but from the wiring diagrams, there is a 30 amp fuse that ties into the circuit. Guessing that's the main high current power feed.

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    NostraJackAss Jack@European_Parts's Avatar
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    I can't completely answer that question, but from the wiring diagrams, there is a 30 amp fuse that ties into the circuit. Guessing that's the main high current power feed.
    Hmmmmm that thing called a blower motor resistor raises the AMP draw & to slow the speed of the motor and is why the 30 AMP fuse is needed......with that comes heat as you observe on the contacts as the current flows through.

    This is why I face palm when some asshole says that a consumer can save on electricity by turning their AC to low setting & happens to be from the utility company!
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    Quote Originally Posted by Jack@European_Parts View Post
    Hmmmmm that thing called a blower motor resistor raises the AMP draw & to slow the speed of the motor and is why the 30 AMP fuse is needed......with that comes heat as you observe on the contacts as the current flows through.

    This is why I face palm when some asshole says that a consumer can save on electricity by turning their AC to low setting & happens to be from the utility company!
    Great, now I'm puzzling on the "why" of this. Resistor is a parasitic part of the circuit?

    Is this also to say the load of the motor alone may not actually be 30 amp at startup/max draw?

  7. #16
    NostraJackAss Jack@European_Parts's Avatar
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    Great, now I'm puzzling on the "why" of this. Resistor is a parasitic part of the circuit?
    See I knew that...........






    Is this also to say the load of the motor alone may not actually be 30 amp at startup/max draw?
    WHAT WHAT WHAT

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  8. #17
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by DeeInSeatown View Post
    Great, now I'm puzzling on the "why" of this. Resistor is a parasitic part of the circuit?
    Old school, before controls were sophisticated enough to PWM the motor.

    -Uwe-
    Ceterum censeo, delenda est Daesh.

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  10. #18
    NostraJackAss Jack@European_Parts's Avatar
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    Old school, before controls were sophisticated enough to PWM the motor.

    -Uwe-

    School time for these guys Uwe............





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  12. #19
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    Quote Originally Posted by Jack@European_Parts View Post
    School time for these guys Uwe............
    PWM...sounds familiar.



    And in the case in an electrical circuit, when a resistor is added, doesn't it lower the voltage and current flow? As the motors max load and current draw is constant, and power is voltage x current, wouldn't the resistor lower the energy consumption? All of which is an interesting but not necessarily pertinent academic exercise as the blower motor regulator on my vehicle is a PWM device, and not a resistive network.

    But to get back to the main question, motor ran fine when I finally got it wired up to a 12v source. Now looking for a new blower motor regulator.

  13. #20
    NostraJackAss Jack@European_Parts's Avatar
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    And in the case in an electrical circuit, when a resistor is added, doesn't it lower the voltage and current flow?
    As the motors max load and current draw is constant, and power is voltage x current, wouldn't the resistor lower the energy consumption?YES
    NO...........heat through the resistor block dissipates to rid the energy burned but the load increases at lower speeds and is why when a resistor block fails, it was due to not enough cooling of air over the fins/heat sink, further to maintain the function bridge of the resistor essentially blows like a fuse and you loose lower fan speeds.

    FYI blower motor resistors traditionally fail on a high degree of humidity set on a low fan speed and usually being a very hot day where AC was required.
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