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Unread 06-23-2013, 09:13 PM   #1
mudsweatNgearz
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Blazer blower motor mod fail!

I needed to replace my heater core so I figured it's a good time to do the blazer motor mod. All went ok till I turned on the heater blower. It will barely run on low fan speed and eventually come to a complete stop. On med and high it runs faster but makes all kinds of noises. It randomly speeds up then slows down and makes clicking noises.

Almost seems like the resistor is not matched for the larger motor.
Any ideas what might be wrong here?

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Unread 06-23-2013, 10:00 PM   #2
DirtKar
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I'm not familiar with the Blazer mod so I'll stick with troubleshooting 101 until someone else steps in. Did you verify that the donor blower was in good working condition? Does it spin solid with a full 12v applied?
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Unread 06-23-2013, 10:40 PM   #3
mudsweatNgearz
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Originally Posted by DirtKar View Post
I'm not familiar with the Blazer mod so I'll stick with troubleshooting 101 until someone else steps in. Did you verify that the donor blower was in good working condition? Does it spin solid with a full 12v applied?
It is a brand new motor from AZ.
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Unread 06-23-2013, 11:52 PM   #4
Anticanman
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That may be your problem.
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Unread 06-23-2013, 11:55 PM   #5
mudsweatNgearz
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That may be your problem.
I meant to say it came from Advance Auto....is that just as bad?
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Unread 06-24-2013, 12:09 AM   #6
packdog
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Direct to battery

Like DirtKar hinted at -- apply a full 12 volts to the motor. Unplug the motor and hook some test leads from the battery to it.

If it works, then you might want to research what size resistor is in your jeep and what size is in a Blazer.
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Unread 06-24-2013, 12:56 AM   #7
mudsweatNgearz
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Originally Posted by packdog View Post
Like DirtKar hinted at -- apply a full 12 volts to the motor. Unplug the motor and hook some test leads from the battery to it.

If it works, then you might want to research what size resistor is in your jeep and what size is in a Blazer.
Thanks for the info...I will do that. There is only one plug with one wire going to the motor...How does it ground?
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Unread 06-24-2013, 03:32 AM   #8
jsawduste
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through the mounting frame.
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Unread 06-24-2013, 05:24 AM   #9
mudsweatNgearz
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Great so I will test it tonight when I get home from work. If I give it a full 12 volts that should be like fan high speed....right?
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Unread 06-24-2013, 07:05 AM   #10
jsawduste
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If I give it a full 12 volts that should be like fan high speed....right?
Yup
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Unread 06-24-2013, 09:44 AM   #11
Reno72
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If I remember correctly some of the motors have a motor spindle that sticks out a little to far. Could the fan be rubbing the housing? This would explain the stalling at less power and noise at higher.
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