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Thread: mx73 intermittent blower motor problem.

  1. #1
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    mx73 intermittent blower motor problem.

    Figures that as soon as it starts getting cold and wet my blower motor would start acting up. Its been doing it for a few weeks, the first time it cut out, I ignored it for a few days, and then on my way to work one day, I hit a big bump, and it turned back on. Worked fine for a few days, then gut out again. So I reached down and thumped the side of the blower motor, and it turned back on. Well, it's cut out again, and I can't get it to start working again. I was thinking maybe a resistor, but it seems that most of the time when a resistor is bad, it will work on certain settings and not others. Any input? I suppose it could just be the motor itself, but neither part is very cheap, so input would be greatly appreciated!

  2. #2
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    Re: mx73 intermittent blower motor problem.

    I'm going to bet it's the motor. I've had several blower motors go bad, but never a resistor. Since hitting the motor itself made it work, that's probably the culprit.

    The definitive way to tell is to check for voltage at the motor with a multimeter. If there is voltage but no spinning, it's the motor. If the switch is on, but no voltage, it's something in the circuit.

  3. #3
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    Re: mx73 intermittent blower motor problem.

    Sounds more specifically like your brushes are bad. They are a wear part and once they get short enough, they just don't make contact. Either that or a loose wire. My heater switch would act up without pattern until it finally quit and I had no defrost when the weather turned. On the back of the switch I felt a loose wire which turned out was moving in and out of contact depending on switch position and bumps in the road.

  4. #4
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    Re: mx73 intermittent blower motor problem.

    It was the motor . Thanks guys!

  5. #5
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    Re: mx73 intermittent blower motor problem.

    Could the blower only coming on when you hit "Auto" but not when you hit "high" or "low" be the motor itself?

  6. #6
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    Re: mx73 intermittent blower motor problem.

    Quote Originally Posted by MR2_FTW
    Could the blower only coming on when you hit "Auto" but not when you hit "high" or "low" be the motor itself?
    I have a similar problem except it is just low that doesn't work.
    There is only one blower doing all the work right?

  7. #7
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    Re: mx73 intermittent blower motor problem.

    That's a different thing that causes that. I forget what it's called, but there's a large sensor that has 2 or 3 coil element that mounts right next to the fan near the heater core. It's a common problem because crap get's in there and damages the elements. Mine is bad too, but it's was unrelated to the fan not working entirely.

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