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Old 02-29-2008, 10:07 PM   #1
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Heater fan control

Amy's 99 TJ , the fan control only operates on the two lowest speeds, any idea why and how to fix?

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Old 03-01-2008, 02:52 AM   #2
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yep but i need to know a little more......need you to pull the heater control box out of the dash.... to get it out is simple ,, take a flat screwdriver and pry the defrost vent up it has little metal clips that hold it to the top of the dash. then you will have to remove the center dash bezel ///there is two screws on top of the bezel and one screw behind the ash tray. after the bezel is of just remove the four screw holding the heater/ac control box.

Pull the box out from the dash. All the way to the right of the box you will see a electric connector pluged into the box beside the vacume lines unplug it and check to see if it is melted inside.

there is more but just get back to me after you check that.

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Old 03-01-2008, 04:59 AM   #3
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yep but i need to know a little more......need you to pull the heater control box out of the dash.... to get it out is simple ,, take a flat screwdriver and pry the defrost vent up it has little metal clips that hold it to the top of the dash. then you will have to remove the center dash bezel ///there is two screws on top of the bezel and one screw behind the ash tray. after the bezel is of just remove the four screw holding the heater/ac control box.

Pull the box out from the dash. All the way to the right of the box you will see a electric connector pluged into the box beside the vacume lines unplug it and check to see if it is melted inside.

there is more but just get back to me after you check that.



Are you talking about the reostat(small plastic and metal box with about 5 springs in it verying in size)???If so can't you get to that behind the glove box???I haven't changed one in a Wrangler but I have on others from Crown Vics to Venture vans and most are behind the glove box.with the exception of the 96 caravan and it is out on the duct work at the fire wall.I am not saying its not were you say it is I am simply asking!!!Or if you are even refering to the reostat???
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Old 03-01-2008, 07:15 AM   #4
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Originally Posted by slf41002 View Post
Are you talking about the reostat(small plastic and metal box with about 5 springs in it verying in size)???If so can't you get to that behind the glove box???I haven't changed one in a Wrangler but I have on others from Crown Vics to Venture vans and most are behind the glove box.with the exception of the 96 caravan and it is out on the duct work at the fire wall.I am not saying its not were you say it is I am simply asking!!!Or if you are even refering to the reostat???
nope. im talking about the electric connector they tend to melt.
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Old 03-01-2008, 08:24 AM   #5
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It's the controlle or blower motor resister pack.
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Old 03-01-2008, 10:50 AM   #6
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It's the controlle or blower motor resister pack.
Yeah that is also known as the reostat.Or at least the local Chrysler parts department if you walk in and ask for a reostat they give you what I call a blower resistor.It is a metal and plastic box with a series of smaller to larger springs and as the voltage travels trought the spring it reduces or increases the voltage.The larger springs put out less voltage to the blower motor and the smaller springs run the high voltage to the blower motor and the smaller springs will tent to brake down and stop carring voltage through to the blower.Or maybe that is exactly bassaacwards but anyway that is what I think it is also.The blower resistor or reostat.
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Old 03-01-2008, 01:52 PM   #7
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I 99% shure the right name the right name is resistor pack. It's not a reostat because thats a varible resister and thats different.
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Old 03-01-2008, 07:19 PM   #8
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skeeter, I have the same problem with my '99. If you look at the back of the switch on mine part of the switch is melted. In a past JP magazine they showed how to fix this for good by putting a relay ahead of the switch. I have been looking for that issue so I can fix it myself but it has been lost in one of my many piles of mags. I think it was March '07 issue as that is the only one I can't seem to find. If I find it I will let you know.
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Old 03-01-2008, 07:23 PM   #9
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http://www.jpmagazine.com/techarticl...ion/index.html

This is what I was talking about. I don't know if you have the same problem, but I will be working on this in the morning.
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Old 03-01-2008, 07:25 PM   #10
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http://www.jpmagazine.com/techarticl...ion/index.html

Sorry I didn't get the whole link before.
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Old 03-01-2008, 08:49 PM   #11
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OK Timber, I have a '97 TJ 4cyl. My problem is the blower only works on the high setting. I took the dash apart and found NO melting in my system.

Now, just to clarify, my dash/panel has a rotating 4 speed blower switch with 2 sliding knobs (temp and air-out location).

After pulling the dash, I've identified the vaccuum lines, the square harness plug that attaches to the prongs of the blower speed switch and lastly a flat 4 wire harness plug that connects to the back of the unit off to the right of the vaccuum lines.
I pulled each of the 2 plugs, one at a time and they both cause the blower to stop running. Neither help in getting the blower to run at lower speeds. From what I'm gathering on this forum, I need to start with replacing the pronged unit on the back of the fan blower speed switch...correct?
Anyone know what the 4 wire flat plug off to the right of the vaccuum lines on this year of TJ does?
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Old 03-01-2008, 08:54 PM   #12
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Hind sight is 20/20. Is that 4 wire flat plug for the AC??
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Old 03-02-2008, 05:34 AM   #13
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Quote:
Originally Posted by BurninRingoFire View Post
OK Timber, I have a '97 TJ 4cyl. My problem is the blower only works on the high setting. I took the dash apart and found NO melting in my system.

Now, just to clarify, my dash/panel has a rotating 4 speed blower switch with 2 sliding knobs (temp and air-out location).

After pulling the dash, I've identified the vaccuum lines, the square harness plug that attaches to the prongs of the blower speed switch and lastly a flat 4 wire harness plug that connects to the back of the unit off to the right of the vaccuum lines.
I pulled each of the 2 plugs, one at a time and they both cause the blower to stop running. Neither help in getting the blower to run at lower speeds. From what I'm gathering on this forum, I need to start with replacing the pronged unit on the back of the fan blower speed switch...correct?
Anyone know what the 4 wire flat plug off to the right of the vaccuum lines on this year of TJ does?
your heater/ac controls are different from Timbers. he should have the three turn knobs in his 99 and your 97 has 2 cable/vacume actuated levers with a turn knob blower selector. They are 2 completely different systems.

for your 97 tj i would check the blower resinator or your blend doors. hopefully it is the resinator because the blend door is in the blower box
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Old 03-02-2008, 05:37 AM   #14
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Quote:
Originally Posted by timberspirit04 View Post
http://www.jpmagazine.com/techarticl...ion/index.html

Sorry I didn't get the whole link before.
SKEETER this was what i was getting at in my earlier post i just didn't want to jump the gun. It is pretty common issue with this controler unit. If this is not your problem them i would check the blower resinator/reostat. lol
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Old 03-02-2008, 05:40 AM   #15
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if that is your problem SKEETER and need some help just let me know i've done this to three tj now so it's not to hard to do. I wound suggest getting a new control box from the Stealership. gonna run ya'll anywhere from 75 bones to 180 bones depending on your stealership.

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Old 03-02-2008, 06:27 PM   #16
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A buddy came over and needed Skeeter to help him with some welding so, I'm doing this myself.

I took the heater/ac control box completely out and looked at all of the connections. I see no evidence of melting or burning anywhere. There is no smell besides normal jeep smell either.

How would I check the blower resinator/reostat?
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Old 03-02-2008, 07:22 PM   #17
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I tried switching a couple of relays around to see if it was a bad relay. Put the control box back together enough to check it and it worked on all settings! I was really happy. The other relay was for the horn and the horn still works so I figured it was just dirty contacts. Put the control box all the way back in and it doesn't work again.
Where would I find the blower resinator/reostat and what does it look like?
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Old 03-02-2008, 07:53 PM   #18
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Link to replacing Blower Resistor in 98' with pics.

http://www3.sympatico.ca/fm.mjb/Resistor.htm

Are you sure it only operates on the 2 "Lowest" Speeds? Apparently the Highest Speed is connected directly to the battery, so it 'should' always work.

None the less, your trouble sounds like Blower Resistor, above link should help.
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Old 03-02-2008, 08:05 PM   #19
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Thanks for the link, NY94YJ. Actually, only the lowest setting works.
This is getting me really frustrated.
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Old 03-02-2008, 08:25 PM   #20
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I have the same problem and it works on all of them but on high.

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Old 03-02-2008, 08:50 PM   #21
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NY94YJ beat me to the link i was trying to find. and he is right the highest speed does not go through the resistor. The resistor is $20 or less at the dealership"they keep them is stock" lol.
If this does not fix your problem it very well could be the switch its self. Before you go pick up the resistor pop the controls back out and clean the terminal good and it doesn't hurt to put de-electric grease on them.
I have also heard stories of spraying WD-40 into the switch to clean off the connections inside. Although i mite try a electric cleaner first. Inside the switch is 4 different contacts they could be dirty.

good luck and tell skeeter he's lucky My wife would be just keep asking me when i was going to fix it.
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Old 03-02-2008, 09:43 PM   #22
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i got bored and like to help so i went out and got my old control box

here it is...


To get the switch out of the box is easy; just pull the knobs off. Simply grab ahold of them and pull torwards you. If you cant pull them off with your fingers use some pliers. Then you will have to take the face plate off; you can use a small flathead screwdriver to pry it off. You will end up with this.



As you can see my problem was melting lol

And finally remove the small screw holding the switch into the back of the box. "see next pic"



In this next pic you can see a small rectangular hole in the side of the switch; here is where you can spray electric-cleaner/WD-40 into to clean the connections.




Also check closely to see if any melting at the bottom of the 5 metal terminals. while doing the disassembly and inspecting my switch one of the metal tabs was slightly melted at the base of it.

Hope this helps/works for you Amy.
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Old 03-02-2008, 11:23 PM   #23
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Wow, thank you! Tomorrow, after work, I'll go check it out. I even keep WD-40 in my jeep so, hopefully, this'll take care of it.
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Old 03-03-2008, 11:24 AM   #24
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good luck and tell skeeter he's lucky My wife would be just keep asking me when i was going to fix it.
Yep, I'm lucky in that she likes the same things I do.
Sometimes I wonder if it would be easier to have a little more traditional wife so I wouldn't have to trick her into getting new tires or check with her to make sure it's ok to work on her rig. She wants to be able to do everything herself.


Thanks to everybody for the help.
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Old 03-03-2008, 09:14 PM   #25
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Looks like it's the fan switch. After work tomorrow, I'll run down to the stealership and get a new one.
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Old 03-03-2008, 09:47 PM   #26
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glad you figured it out.
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Old 03-03-2008, 09:48 PM   #27
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Thank you for all of your help.
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Old 03-03-2008, 10:10 PM   #28
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no problem just get'er fixed up
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Old 03-04-2008, 07:10 PM   #29
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IT WORKS, IT WORKS!!!!! I'm doin' a happy dance.

Thanks guys!
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Old 03-04-2008, 09:05 PM   #30
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ya'll get a new switch for it?

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