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Unread 08-30-2007, 08:09 PM   #1
gm77979
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2003 TJ Wrangler 
 
Join Date: Oct 2006
Location: Texas
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Dash fan not working

The dash fan (AC/heater) would not come on today. It now will only work on the forth speed (high).
Any ideas on what is wrong or how to diagnose the problem.
2003 Wrangler 13,000 miles

Thanks

Glen

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Unread 08-31-2007, 05:15 AM   #2
kloppk
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1992 YJ Wrangler 
 
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Location: Massachusetts
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A bad blower motor resistor will cause this.

A very common problem. They are easy to replace.
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Unread 08-31-2007, 07:59 AM   #3
halfmoonclip
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The usual diagnosis for losing fan speeds is a failed resistor. The resistor steps down the voltage to slow down the fan. Speed four is 'no resistance', so it continues to work.
The resistor is located behind the glove box, and is a relatively cheap and easy fix (ruling out the 'hanging upside down under the dash like a bat in the daytime' and getting the @^$#^%#^#^%!!!!! electrical connection to pop loose); part costs less than $20.
Do a search; there are great photos to help you find the resistor, which is a challenge in itself.
Moon
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Unread 08-31-2007, 08:01 AM   #4
EvilM0nkey
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Quote:
Originally Posted by halfmoonclip
The usual diagnosis for losing fan speeds is a failed resistor. The resistor steps down the voltage to slow down the fan. Speed four is 'no resistance', so it continues to work.
The resistor is located behind the glove box, and is a relatively cheap and easy fix (ruling out the 'hanging upside down under the dash like a bat in the daytime' and getting the @^$#^%#^#^%!!!!! electrical connection to pop loose); part costs less than $20.
Do a search; there are great photos to help you find the resistor, which is a challenge in itself.
Moon
But you have to use the google search for now till we get our new servers
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Unread 09-01-2007, 02:02 AM   #5
Rossta
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Quote:
Originally Posted by halfmoonclip
The usual diagnosis for losing fan speeds is a failed resistor. The resistor steps down the voltage to slow down the fan. Speed four is 'no resistance', so it continues to work.
The resistor is located behind the glove box, and is a relatively cheap and easy fix (ruling out the 'hanging upside down under the dash like a bat in the daytime' and getting the @^$#^%#^#^%!!!!! electrical connection to pop loose); part costs less than $20.
Do a search; there are great photos to help you find the resistor, which is a challenge in itself.
Moon
Would this be the same diagnosis if speeds 1,2 and 4 work but not 3? This is the problem I am having with mine. I am guessing the answer is "yes", but my situation is slightly different from the OP's.
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Unread 09-01-2007, 07:47 AM   #6
Woodyhfd
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Leave your fan off until you fix this! The damaged resistor can cause the wires leading to it to overheat and melt, making the fix a bit more complicated.
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Unread 09-01-2007, 08:46 AM   #7
flatlander757
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Quote:
Originally Posted by Rossta
Would this be the same diagnosis if speeds 1,2 and 4 work but not 3? This is the problem I am having with mine. I am guessing the answer is "yes", but my situation is slightly different from the OP's.
Yep.

I'm missing my lowest speed fan, I really oughta get around to fixing that haha.
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Unread 09-01-2007, 11:35 AM   #8
halfmoonclip
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Quote:
Originally Posted by Rossta
Would this be the same diagnosis if speeds 1,2 and 4 work but not 3? This is the problem I am having with mine. I am guessing the answer is "yes", but my situation is slightly different from the OP's.
Flatlander had the same issue I did; #1 was out, I'm not sure for how long, before I got around to fixing it.
So, yes, it's the same diagnosis.
Moon
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'04 Rubi, manual, usual options, Hella H-4s, any range lockers, Randy's booster seats, Oly pushbar, 245/75R16 BFG
'09 Audi A4 Avant- my bride's schnellpuffenpanzer
'12 Ford Focus-the sure way to get good Jeep mileage
'07 Dodge Caliber R/T AWD-da kid's ride
Goodbye Old Blue XJ; 10+yrs, 100K+ miles; virtually trouble free; Long may you run!
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Unread 09-01-2007, 12:25 PM   #9
Rossta
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OK, thanks for the responses moon, flatlander and woody!
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