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Thread: Heater Blower

  1. #1
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    Default Heater Blower

    Ok, so I have a 1997 ZJ with the 4.0. My blower will occasionally decide that it wants to turn on, but generally I just freeze my balls off. After work today I pulled the motor, tested it, it worked. Put a voltmeter to the resistor, at this point my battery was dying so it read slightly low, but the resistor was working (not that it would even matter on high anyway). While I was flipping through my service manual, my boss said that he was getting power from both positive and negative. But I didn't check myself so I'm not sure if that's the case. Someone please help me fix my heat! It's getting cold in Wisconsin.

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    I am a chapter of one sincitycj's Avatar
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    If your motor is working and the resistor is reading good, the issue could be with the switch itself.
    Quote Originally Posted by usnavymitchells View Post
    went to google to see if I too was a dumb ass!!! Well actually I am.

    http://www.sincityrubs.com/

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    Professional Goober spc15t's Avatar
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    why are you getting power from both pos and neg? confirm that and then check circuit and find where power is coming from

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    By the way, I should mention that I'm electrically impaired. I'm basically learning vehicle wiring as I go here. A new idea popped into my head, possibly checking to see if the resistance is too high in my current motor, and then check what it should be in a new one. If the resistance is too high, it may not be able to actually work (correct me if I'm wrong here). What could cause me to get power from both positive and negative? So it's narrowed down to possibly the switch, possibly a short circuit or possibly that the resistance in the motor is somehow too high. Is that correct? So to narrow down the location of a short, should I just use a jumper wire from different spots between the blower motor and the fuse? That should give me a general area I think. And then for the switch I would just jump from where power runs to the switch straight to where it runs out from the switch, just bypassing the switch completely? Thanks for the help!

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