HOWTO: Replace the MTC Blower Motor Resistor - Page 2 - JeepForum.com

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post #16 of 56 Old 01-14-2011, 07:18 AM
xOakley
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Well what exactly is it doing, maybe we can further pin point the problem. I still havent gotten around to replacing mine but I have ordered the wrong part twice lol I realized i was ordering on for an "manual" A/c unit and the part dosnt have as many connectors on it. I cant find one for me, but I have NOT tried the dealership. I dont even try and buy things like that from them, they tend to charge tooooo much for me.

Use the pictures above, they will help you get right to it. I would take the resistor out completely and drive over to the dealership WITH IT so you can compare the part you have to the one they are selling you. Not sure about the jeeps but on alot of cars they have updated them and the resistor looks sightly diffrent on the outside. Just make sure its got as many plug connections as yours. Good luck and keep us updated


sold- 98 xj - RE 3.5 lift, 31 A/T
sold- 99 tj - 4in BDS, 3in body, 35 claws, line-x inside, flow 50, much much more
05 WK 5.7 HEMI 2in RC lift, 1.25" wheel spacers, 285-75-17 Cooper STT on MOAB's, Rola Rack with extension, Home made front push guard, 4xGuard front skid
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post #17 of 56 Old 01-14-2011, 07:25 AM
CmmdrDan
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Will this help with the problem of it not shutting down completely? When i turn the heat off it still blows hot air, its not blowing hard but enough to make me sweat..
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post #18 of 56 Old 01-14-2011, 10:42 AM
MBDiagMan
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The blower motor that I'm working on is completely dead. I have checked the fuses, but have not gotten into the guts of anything yet. I found the correct wiring diagrams, so I plan on troubleshooting tonight or tomorrow.

It looks like I will begin by going to the resistor, since it's easy to get to, and checking for voltage from there. If it has voltage I will jump 12V to the motor and see if it turns. If not I guess I will have to figure out how to get to the fan switch to check for voltage there.

It sounds like the resistor is a problem area. If I'm lucky and it's the culprit, I will take it to the Jeep dealer for a replacement. I live 20 miles from a town of 25,000 so there aren't too many options for getting such a part.

Thanks for the replies.
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post #19 of 56 Old 01-20-2011, 09:29 AM
MBDiagMan
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I'm posting my outcome in several places in hopes that someone in the future will benefit from what I found.

The earliest WK had a Technical Bulletin specifying an upgrade for the blower resistor and connector. Your dealer can find it and will want your VIN to use for the search.

In our case it took out the heater control in the dash. This was all very easy to deal with once I found the disassembly instructions on this site.

I hope this serves to be helpful to someone in the future and thanks for all the help from those on this site.
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post #20 of 56 Old 03-13-2011, 09:56 AM
jager00
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God write up. I was actually trying to do it the other day but didnt know which screws to take out so I just didnt mess with it lol

2007 JK Sahara- trying to figure this one out


2005 WK 9" lift on 37's with all the goodies- regretfully sold :(
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post #21 of 56 Old 04-25-2011, 08:57 AM
rbptrsn
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I replaced my resistor and I am having the same problem. I the blow works fine then it shuts off for a minute (Like its taking a breath) and turns back on. Sometimes it only works on high until i hit the side underneath the glove box. Summer is coming soon, I need my AC.
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post #22 of 56 Old 04-25-2011, 09:01 AM
jager00
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Is the connector fried? You might have fireplace that too

2007 JK Sahara- trying to figure this one out


2005 WK 9" lift on 37's with all the goodies- regretfully sold :(
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post #23 of 56 Old 04-25-2011, 09:12 AM
rbptrsn
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It looked fine when I replaced the resistor. Nothing burnt on the connector.

Quote:
Originally Posted by jager00 View Post
Is the connector fried? You might have fireplace that too
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post #24 of 56 Old 04-25-2011, 09:14 AM
jager00
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Then im lost lol... that was my alturnative solution lok

2007 JK Sahara- trying to figure this one out


2005 WK 9" lift on 37's with all the goodies- regretfully sold :(
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post #25 of 56 Old 08-05-2011, 11:26 AM
pinacocacola
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Same problem, blower motor of 06 commander only pushed air on high, eventually went out.

bought a new blower motor resistor, found out there was always 12v power to the blower motor. Examination of blower motor showed burned out bearing. Resistor still at correct volts and ohms. But it cant hurt to keep the new one in. Thanks for the DIY, we need more like it.
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post #26 of 56 Old 08-05-2011, 11:38 AM
BigSensFan
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Would bad resistors be the reason the Fan does not always come on?
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post #27 of 56 Old 08-23-2011, 10:01 AM
rbptrsn
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Wiring Harness

Does anyone know where I can find a wiring harness? Nobody seems to carry it. I have checked ebay, autozone, and etc.
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post #28 of 56 Old 08-23-2011, 10:05 AM
JRLT
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Just got the 2005 GC back from the dealer. They said that the blower motor is drawing too much current, which fried the resistor, so just changing the resistor is just a temporary fix until it happens again.
He recommended a new motor & resistor, was a $100.
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post #29 of 56 Old 08-23-2011, 10:17 AM
rbptrsn
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I went back and checked the wire harness after the symptoms started again and it was burnt. The resistor seem fine, no damage. I found the parts on justforjeeps.com. I am going to try to replace it, the wire harness seemed lose. Hopefully that will fix it, if not then I will replace the blower.

link here: http://www.justforjeeps.com/blmore.html

Part number - 5191797AA
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post #30 of 56 Old 08-24-2011, 12:44 PM
MBDiagMan
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Okay, here's the deal.

The early versions that require the upgrade of the resistor, will almost certainly need the upgraded connector. Both are available at the dealer and they will want your VIN to get the right part. Also, from the link posted here a few posts ago, it sounds as if someone found these parts available from a third party source.

If you leave the original connector, it may be burnt, but not easily seen. This is most likely what is giving you the intermittent blower operation.

One poster indicated that there is 12V at the motor all the time. That is the way it's designed. The switch provides different resistance paths on the GROUND side to control motor speed.

As follow up, after upgrading the resistor and connector in my daughters WK back in January, it has run perfectly even during the hellish Texas Summer we're dealing with.

Hope this helps someone,
Doc
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