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Unread 12-18-2010, 01:06 PM   #1
Bill_Dunnigan
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Blower only works on high

Hello all,

My 2005 Jeep wrangler rocky mountain is having an issue. the fan for the heat only works on high. this orignally led me to believe that the blower motor resistor (credit card type) was bad. i bought a replacemnet from rock auto and replaced it. however, it still only blows on high. anyone know of what other components need to be replaced. would it be the relay pack. Anyone know where to get one?

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Unread 12-18-2010, 01:16 PM   #2
micklock
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might be the selector switch. Try pushing in on it and see if it works, thats how I knew mine was bad.
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Unread 12-18-2010, 02:32 PM   #3
JBTJ
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The next thing I would check is the switch, the one on the control center. You can pull the panel out to get to the switch. Look for signs of melting parts. seems to happen alot.
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Unread 12-18-2010, 02:44 PM   #4
TheBoogieman
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Melted wires?
Amazon.com: Heater Switch: Automotive
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Unread 12-24-2010, 06:25 PM   #5
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Not the switch

I have the same problem, heater blows on high only. I pulled the wires off of the back of the switch, ran a jumper wire from the hot wire to the other three connectors on the plug. The motor only worked on high when I touched the jumper to one connector, nothing on the other two.
Could it be the motor dragging so much it will only spin when turned on high? I don't know if I am explaining this right. Not enough amps on low to turn the motor?


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Unread 12-24-2010, 06:35 PM   #6
vis_eclipse6g72
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it is your resistor pack.....there is a pack of 4 resistors in the dash board. the lower you set the control, the more resistors the power goes through to get to the motor and the 5th setting doesnt use a resistor thats why it works...typically you will see this pack and it will be melted.... it should be cheap like around 20-30$. hope this helps.
EDIT: on setting 1 it goes through resistors 1,2,3 and 4. on setting 2 it goes through 1,2 and 3, on setting 3 it goes through 1 and 2 and on setting 4 it goes through resistor 1...setting 5 doesnt go through a resistor its a straight wire...so the first resistor is blown, stoping power from going to any of the other resistors and then to the motor...i edited it to help make it easier to understand...

EDIT: i did not notice you replaced you resistor pack in the original post and cant find how to delete my post....sorry
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Unread 12-24-2010, 06:45 PM   #7
C2U5H
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If it only works on high = resistor. Behind glove box, 10 mins to swap out. Cheap part.

If only _____ works, or if high doesn't work, it's the back of the switch. Known problem, melted connectors/terminals/wires. Replace the fan speed selector switch. Also a cheap part with maybe 15 mins to change out if you've had the dash out before.
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Unread 12-24-2010, 06:58 PM   #8
Mike07925
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Ive been down this road, its the blower motor resistor. $30 at orielly or wherever you buy parts. Behind glove box as stated before. 15 min job max, 5 for the job itself, 10 for drinking a beer or 2. If the switch only worked on setting 1 and 3, then it would be the fan switch on the dash next to the temp switch. since it only works in 4, the blower motor resistor isnt working, the system pours out only one rate of flow, high speed. the blower motor resistor changes the air flow. I made the mistake of assuming it was the switch, and since dealers wont let u return electrical parts, I blew $45 on the fan switch i didnt need.

Last edited by Mike07925; 12-24-2010 at 07:13 PM..
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Unread 12-24-2010, 07:10 PM   #9
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Thanks

Thanks for all reply's so quickly. I will check it out tomorrow, Christmas morning. Have a Merry Christmas.


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Unread 12-24-2010, 07:21 PM   #10
xkuzme1
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It is a resistor... from quadratec (item number 51215 0004)crown autoparts part number is 4864957. $26

You'll need a 5/16 socket and needle nose pliers.

It'll take you 10 min if you know what your doing... And 12 if you don't. Take out your glove box and look in... Down... On the right.

So easy even a caveman...

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Unread 12-24-2010, 10:13 PM   #11
Knuckelhead
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Quote:
Originally Posted by vis_eclipse6g72 View Post
it is your resistor pack.....there is a pack of 4 resistors in the dash board. the lower you set the control, the more resistors the power goes through to get to the motor and the 5th setting doesnt use a resistor thats why it works...typically you will see this pack and it will be melted.... it should be cheap like around 20-30$. hope this helps.
EDIT: on setting 1 it goes through resistors 1,2,3 and 4. on setting 2 it goes through 1,2 and 3, on setting 3 it goes through 1 and 2 and on setting 4 it goes through resistor 1...setting 5 doesnt go through a resistor its a straight wire...so the first resistor is blown, stoping power from going to any of the other resistors and then to the motor...i edited it to help make it easier to understand...

EDIT: i did not notice you replaced you resistor pack in the original post and cant find how to delete my post....sorry
Where did you come up with this BS???...
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Unread 12-25-2010, 12:34 PM   #12
Justins_TJ
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What's BS about it? Sounds like he measured the pins on the actual card. Maybe not right since it's been changed but the general theory about the operation of the resistor network seems correct to me. My resistor network is physically different but it works the same way, I just had the schematics out trying to figure it out the other day.
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Unread 12-25-2010, 02:14 PM   #13
Knuckelhead
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Quote:
Originally Posted by Justins_TJ View Post
What's BS about it? Sounds like he measured the pins on the actual card. Maybe not right since it's been changed but the general theory about the operation of the resistor network seems correct to me. My resistor network is physically different but it works the same way, I just had the schematics out trying to figure it out the other day.
There are 4 speeds on the HVAC switch for the blower motor and 3 resistors in the blower motor resistor block.
Calling it BS may have been a bit harsh...
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Unread 12-25-2010, 02:18 PM   #14
vanillathrilla
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Mine only works on 1, 2, 3.

Friggin' Jeeps!
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Unread 12-25-2010, 02:45 PM   #15
Justins_TJ
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I'm not sure about the newer style but on the older one there is only one resistor. If there are only 3 then it probably uses a mix of 2 of them or something. The rest of the things on mine are just coils, which also provide some resistance. Same principle though. When I get my new one in the mail I'm going to get the resistance from each setting and then measure the current so I can figure out the wattage. I'm thinking that I can get a resistor from radio shack for a few bucks and fix the old one and have a spare. Probably no way to fix the newer ones though.
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