Question about 1999 Jeep Wrangler

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Heat-ac blower motor only works at high speed, i changed the climate control and it's still doing the same thing.

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  • Anonymous Jan 06, 2009

    I have the exact same problem with my jeep.

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  • 475 Answers

Change the blower motor resister

Posted on Oct 27, 2008

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1 Answer

Blower motor is stuck on high. i have control of the a/c and the directional funcion. no control of the heat side or off and on. its automatic climate control, and the display is now blank. i have changed...


If the blower motor only works on high mode, then its problem with blower motor resistor. ------------------ The blower motor resistor needs to be replaced.This will make blower motor work on all modes. ----------- Thanks.

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Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.

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If you have manual air conditioning replace the high blower relay
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this problem is caused by the blower motor speed control resistor being defective, it is located next to the blower motor.

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if it was a vacuum leak it would not do it intermittently, first you should replace your blower motor resistor to correct the only working on high fan speed and the reevaluate the a/c it could be affecting the climate control

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I'm assuming the problem is the blower motor isn't coming on or working. 1st, check the fuse. 2nd, remove the glove box or pull the 2 tabs that act like stops when it's open ( the glove box will open out further) and you'll see the power plug connector for the blower unit. Turn on the blower through the climate control (heat, A/C, or whatever) and wiggle the connector to see if the blower turns on. If starts working, then an easy solution is pull the connector off and gently press the prongs together or inward. Then carefully reconnect with damaging the prongs. This worked for 96 Mark VIII due to the fact the prongs were not "seating" correctly in the female connector. It's been about 2 years since I did this and the connection is still good. If wiggling the plug doesn't work, pull the plug, turn on the climate control (heat, A/C), and check for voltage to the plug. That's about all I can help with.

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Blower motor or resistor?


Yes its the blower motor resistor.

More then likley theres some trash or something in it, or possibly the motor itself is on it's way out. There not that bad to pull out of that body car, just pull it out and see what you can see.

The blower motor is under the glove compartment

You can replace the resistor on your own. Please find a detailed diagram which would guide you to do it.

http://autorepair.about.com/library/images/bl629a-lib.htm

Thanks

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blower motor resistor maybe why it only blows on high

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