Heater blower only works on high - JeepForum.com

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post #1 of 17 Old 11-20-2008, 05:50 PM Thread Starter
achipnachair
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Heater blower only works on high

I cant figure it out. Only High works. Blows where I want it to. HELP PLEASE


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post #2 of 17 Old 11-20-2008, 05:51 PM
ItzaKaDoozie
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check the switch. evidently the things are legendary for failing in jeeps.

g'luck
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post #3 of 17 Old 11-20-2008, 05:52 PM
RckRdyXJ
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Blower motor relay under dash on pass side about $40. Defrost is the fail safe mode. Its got 1 plug and 2 screws.

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post #4 of 17 Old 11-20-2008, 07:51 PM Thread Starter
achipnachair
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I can switch between floor, panel or defrost no problem. I just have no low or med on fan speed. Only high.

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post #5 of 17 Old 11-21-2008, 08:52 AM
delstele
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There's a relay behind the glove box for the blower control bout $9 bucks at your local parts distributor
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post #6 of 17 Old 11-21-2008, 02:09 PM
KamekLocked
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It is the blower resister because high isfrom battery power but all other speeds go through the resistor. If it works on high obviously the relay is good.

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post #7 of 17 Old 11-21-2008, 02:21 PM
xjfever
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Quote:
Originally Posted by KamekLocked View Post
It is the blower resister because high isfrom battery power but all other speeds go through the resistor. If it works on high obviously the relay is good.
correct, the blower works just as Kameklocked described. the ability to switch from defrost to vent to floor, is controlled by vacuum.

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post #8 of 17 Old 11-21-2008, 04:06 PM
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And, if the thermal fuse in the blower motor resistor pack has blown (which yours surely has), the blower motor itself is likely bad. Both are easy to change in a '93--the resistor pack should be under $20 at the dealer and the blowe motor should be around $30 at Advance Auto (or the like).

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post #9 of 17 Old 11-21-2008, 04:13 PM Thread Starter
achipnachair
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Thanks for all the help. The blower motor is fine so im going to replace the resistor and see what happens. I'll let ya know.

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post #10 of 17 Old 11-22-2008, 06:41 AM
conrasm
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You can acutally replace the thermal fuse if you like tinkering around with things. They are are about $2 at radio shack. I'll look for the write up I did when I had this problem in the past.

EDIT:

Here's a link with a few pics when I fixed mine. There are also some links to the thermal fuses that radio shack sells. They usually stock them in the store. It's a pretty easy job if you can solder. I would think you could just crimp it in also. The reisitor pack is easy to get too so you can work on it inside.

http://www.jeepforum.com/forum/f11/blower-motor-resistor-206575/

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post #11 of 17 Old 11-22-2008, 07:50 AM
DLYoung1
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Total agreement on the "blolwer motor resistor block" (the exact name to ask for), because I just replaced it about three days ago on my '93. Just under $17 at the local dealership. Just drop the little plastic cover located down at your right foot (if you are seated in the passenger seat), and you'll see the plug attached to the resistor block in the side of the blower housing. Five minutes and you'll have all four speeds back.

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post #12 of 17 Old 11-22-2008, 07:01 PM Thread Starter
achipnachair
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Well I wish I had read this today before I went and orded the $30 resistor. OH well live and learn. I should have it mid week. I'll let you know how it goes. I am saving that link tho. TYVM for the help.

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post #13 of 17 Old 11-22-2008, 09:48 PM
BrunoS
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do be aware that from 84-96 the xj uses a 4-spd fan switch in the heater/temp control area that can burn out as well.

in my case, the blower would work on low, med, and not on high or shigh.

i pulled the old switch and got another one from a earlier mopar minivan and replaced my fried one. it also crispied the wiring harness connector to the blower speed switch. IF you smell burning electrical on high blower speed that comes/goes, or have to "tap" the blower speed selector before it works...then you blower switch is going to die like mine... but it's easy to fix.

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post #14 of 17 Old 11-23-2008, 01:48 AM
mud-dog27
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well i litterally just finished fixin mine like an hour or two ago and had same problem like a month ago i onl had high then i had nothing unless i was driving at a decent speed any way my controls obviously worked i could cycle through the diffent modes.....i had no speed control unless manually push started with screw driver...any way the resistor pack is easy to checkhttp://www.geocities.com/chmwatson/F...elink_fix.html
and the blower motor is easy and cheap enough to replace ($57cdn)
http://www.lunghd.com/Tech_Articles/...ower_Motor.htm

i didnt even know i had 4speeds and now it blows better than ever just in time for winter

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post #15 of 17 Old 11-23-2008, 11:44 AM
delstele
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Quote:
Originally Posted by KamekLocked View Post
It is the blower resister because high isfrom battery power but all other speeds go through the resistor. If it works on high obviously the relay is good.
Trust me the fan will quit shortly after just working on high been there done it.
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