Heater Blower Inop/intermittent very slow

[87MJJeep]

Today I was driving my '87 MJ 4.0, and when I changed from Vent or Heat to Defrost, the fan quit running.  Flipping back to the other positions made no difference, but within a minute I could tell some air was moving again.  It really feels like it was blowing the same speed on all 4 speed settings.  At times it would stop completely, then start back up, but always at the really reduced speed.  I took a 30 minute drive, and it was blowing at what seems to be either the lowest speed or a tad slower.  At times I think it sped up a little but not much.  Just before I got home, it quit blowing completely. 

 

No odd noises were heard.  Is this the resistor pack I've read about in threads I just searched?  Or would a motor behave this way? 

 

Where is the preferred place to get either of those parts? 

 

Thank you!

 

 

Edit:  there is a chance I changed the speed just before/after I changed the selector over to Defrost.,  Also, I noticed the voltmeter reading stays the same regardless of the speed position.  It's not pulling the load it normally does when operating on High speed.  I kinda think/assume a motor failing due to bearings dragging may draw more juice, but that doesn't seem to be the case. 

 

Edit:  I just remembered that 1/2 a mile before this happened, I hit a huge puddle of water.  Is it possible water could have gotten somewhere it shouldn't?  The inop started only when I changed the settings.  I can see where there is some dampness where the cowl meets the "shelf" just below the blower motor, but it's not soaked. 

 

Edit:  one more!  With Key On, Engine Off, I hear absolutely no sounds when I turn the heat on and change the fan speed.  Whatever was intermittent seems to be totally dead now. 

[Brickmiata]

In for solution. Mine does similar things

[87MJJeep]

I just figured out how to jumper the blower.  Connected to the battery, it blows just fine.  The fact it doesn't blow on High speed rules out the resistor pack based on what I've read in other threads.  Is that correct? 

 

Something occurred to me when I read this post in another thread:

 

Thread:

http://comancheclub.com/topic/44026-new-blower-motor-not-functioningmust-be-something-else/?hl=clicking

 

Post #21

http://comancheclub.com/topic/44026-new-blower-motor-not-functioningmust-be-something-else/page-2?do=findComment&comment=449499

 

Ever since I got my A/C working again two summers ago, the compressor cycles off and on a lot, and when it does, I hear a click around the passenger feet area.  SInce this blower issue occurred when I switched to Defrost (which uses the compressor), I wonder if there is any connection...?

[87MJJeep]

I guess I am just a youn' grasshoppa when it comes to electrical stuff.  I should have looked at the fuse first.  It was melted.  It was not too scorched, but there was some portion that was getting a little darker than its original shade.  There was a 25A fuse in that slot.  Is that the correct rating?  I put the radio's 25A fuse in its place, and I have a blower again. 

 

I am concerned at what has caused it to get that hot.  Any input is appreciated. 

[BlackBeast]

Motor might me drawing to many amps??could have a short? Or resistor is shot and caused a short..I would check your voltage from blower motor first to see what it's pulling as far as amps. My thoughts.

[87MJJeep]

What is the correct way to check the voltage? Poke a multimeter's leads into the two wires going into the blower?

Thanks!