Question about 2005 Jeep Grand Cherokee

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2005 jeep laredo-heater/ac fan speed control only works on high

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Hey! Oddly enough, mine started with the same thing this morning. I Googled the heck out of this and I'm more than satisfied that the most likely culprit is the blower resistor. This is EXCELLENT how-to guide (with lots of positive results): http://bvensko.blogspot.com/2008/02/how-to-repair-jeep-grand-cherokee.html

Posted on Feb 05, 2010

  • looie71 Jan 03, 2011

    This was fantastic...easy and cheep fix (even for a girl who is NOT handy!)

  • Victor Martinez Jan 10, 2014

    Thank you for the information, let's keep up the circle help. I like the title for a website.

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I had the same issue on a 2001 where the fan worked only on high. While looking for the resistor under the dash, I found that a passenger had evidently kicked the connector partially loose and bent the prongs. Only two of the four prongs were making contact. I straightened the prongs and re-inserted the connector. All is well!!

Posted on Mar 09, 2010

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2005 jeep AC and heater blower only high speed works


check fuses, then wiggle speed control while moving, may need new dash control for lower speed, usually high speed works through relay may be the reason high speed works

Nov 03, 2010 | 2005 Jeep Grand Cherokee

1 Answer

I own a 2005 jeep liberty. the ac, heater fan only works on selector switch setting # 4. nay sugesstions on why fan does not work on settings 1, 2 or 3.


The lower speeds are accomplished by running the power supply through various resistors that drop the voltage which makes the blower turn at different speeds. The lowest setting uses all the resistors to drop the voltage as much as possible to turn the blower as slow as possible. High speed uses no resistors so the blower gets full power and turns as fast as possible.

Since speed 1 and speed 2 use the speed 3 resistor to drop there voltage and speed three is not working as well my guess is the speed three resistor is burnt out in the device referred to as the blower motor resistor or blower motor speed control module. This is located near the blower motor and is held in place with 2 screws. There will be several wires and possibly two connectors plugged into it.

These are really common failures in many vehicles. The parts are usually available at your local auto parts store and they are typically not that expensive.

Hope that helped.

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1 Answer

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next to the fan motor there should be a connector that has three or four wires that attached to the blower resistor. it should have two screws holding it to heater case, just pull it out and replace.

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1 Answer

1996 Jeep Grand Cherokee Laredo AC blower wont work on high


I'd check the relay and the resistor ...don't have a location for yours but the resistor is always installed into the heater box so it stays cool. you can usually follow the wiring back to the relay as it's generally nearby. Resistor looks like a piece of circuit board material with several wires connected to it with two screws holding it to the heater box so it sits flush except for the wires. It has several coils inside...any that are broken have failed.

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2 Answers

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hello, this sounds like a bad blower motor resistor!! its cheap and easy to change..if you need more info on locations let me know,, good luck.....marty

May 27, 2009 | 2005 Jeep Grand Cherokee

1 Answer

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replace the blower speed control resistor, they short and allow this to happen

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3 Answers

Heat/AC Blower fan speed only works on High


Alot of people have the same problem with the fan switch and blown bulbs. There really is no fix for this. Jeep really screwed up when designing the heater control assembly. The cheapest solution is to buy another unit off Ebay. Can always go to the dealer but be ready to PAY for there mistakes.

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1 Answer

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