2000 TJ blower motor works intermittently - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-12-2010, 02:38 PM   #1
Newb
 
Join Date: Nov 2010
Posts: 6
2000 TJ blower motor works intermittently

I have struggled with my heat/AC for a few weeks now. It has been working off and on but now seems to have quit. I replaced the fan switch and pigtail as they mere needed. All fuses, the relay, and the resistor test as good. I have power at all points throughout, including the plug that goes in the fan motor itself(12.7v). If I hook the blower motor straight to a battery, It works fine. But when I plug it in to the terminal, even though it shows to have power, I get nothing. It is quite a mystery. Has anyone else dealt with this? Your help is greatly appreciated.

jambo is offline   Quote Quick Reply
Old 11-12-2010, 03:37 PM   #2
Jeeper
 
mrcarcrazy's Avatar
 
Join Date: Jul 2009
Location: Midland/Odessa, TX
Posts: 3,903
are you certain the fan speed switch works?

does it work on any fan speed?

I've had to replace that damn switch twice in a year of ownership.

if it works on full blast, and no others its a relay pack, if it works sometimes on each then I'd suspect that switch or a short. (re check all your repairs)

__________________
#2 Jeep http://www.wranglerforum.com/f322/99...ld-819418.html
99 Sahara, automatic.
mrcarcrazy is offline   Quote Quick Reply
Old 11-12-2010, 04:25 PM   #3
Jeeper
 
47MTP's Avatar
 
Join Date: May 2008
Location: North Carolina
Posts: 138
Make sure the plug going into the blower motor has a good connection and is seated properly. I have to go under the hood at least once a week and re-seat the connection on mine. I'll fix it for good one of these days.
Bert
47MTP is offline   Quote Quick Reply
Old 11-12-2010, 05:19 PM   #4
Newb
 
Join Date: Nov 2010
Posts: 6
It is new

Quote:
Originally Posted by mrcarcrazy View Post
are you certain the fan speed switch works?

does it work on any fan speed?

I've had to replace that damn switch twice in a year of ownership.

if it works on full blast, and no others its a relay pack, if it works sometimes on each then I'd suspect that switch or a short. (re check all your repairs)
I bought a new switch and pigtail from a local dealer. Have gone through repairs several times. Everything is done correctly as far as I can tell. Also, When you test the switch for continuity in the different positions, it is good in each. Thanks.
jambo is offline   Quote Quick Reply
Old 11-12-2010, 05:23 PM   #5
Newb
 
Join Date: Nov 2010
Posts: 6
Checked

Quote:
Originally Posted by 47MTP View Post
Make sure the plug going into the blower motor has a good connection and is seated properly. I have to go under the hood at least once a week and re-seat the connection on mine. I'll fix it for good one of these days.
Bert
It is a good connection. I think I may wire it on a toggle switch for a few days. No permanent thing, just until it gets fixed. The dealer here charges around $75/hr for labor. I am not yet willing to go that route, but the weather is cold and getting colder.
jambo is offline   Quote Quick Reply
Old 11-12-2010, 05:42 PM   #6
Jeeper
 
pokey's Avatar
 
Join Date: Feb 2010
Location: backroads of the Mojave
Posts: 1,106
Your problem could be the connection on the back of the climate switch (the 3 wire connector that plugs into the back of the climate switch). The 3 wires are the fan relay, ground, and a/c control. They are prone to melting just like the connector on the back of the fan speed switch. Check it out good.
__________________
__________________________________________
. . . . picking the lines with my twenty-nines . . . .
__________________________________________

'99 sport 4.0 5 speed, top-of-the-line floormats
pokey is offline   Quote Quick Reply
Old 11-12-2010, 06:37 PM   #7
Newb
 
Join Date: Nov 2010
Posts: 6
Quote:
Originally Posted by pokey View Post
Your problem could be the connection on the back of the climate switch (the 3 wire connector that plugs into the back of the climate switch). The 3 wires are the fan relay, ground, and a/c control. They are prone to melting just like the connector on the back of the fan speed switch. Check it out good.
Will do that in a few minutes. I just came in from the garage where I doublechecked the voltage coming to the blower motor plug. It reads as follows: Position 1 = 12.78v; Pos. 2 = 12.79v; Pos. 3 = 12.80v; Pos. 4 = 12.84v. I put 14g wire w/heavy connectors on the blower motor after it was bolted in and put that straight to the battery, it takes off and works perfectly. But the plug with as much as 12.84v on it does not turn the motor. Is it possible that I am getting a connection with the new connectors that is not happening with the original (old and possibly corroded) plug. Will let you know what happens, I must try something.
jambo is offline   Quote Quick Reply
Old 11-15-2010, 02:59 PM   #8
Newb
 
Join Date: Nov 2010
Posts: 6
still perplexed

I have had a little time to work again. I have power on the hot wire that plugs in to the fan. When I check it with a voltmeter, it shows voltage (shown on a previous post). However, nothing when I plug it into the motor. I made up some leads and plugged them into the motor. When I connect it to the plug on the hot side and ground it, the motor runs like a top. Try it on the grounded side, nothing. Yet, it shows voltage when using the plug. Is it possible there is a loose ground or that the resistor is functioning but weak and is not handling the load of the motor? Any thoughts are appreciated.
jambo is offline   Quote Quick Reply
Old 11-16-2010, 07:44 PM   #9
Newb
 
Join Date: Nov 2010
Location: Hooksett,New Hampshire
Posts: 6
Brand new to the forum, former Ford mechanic, very common, sounds like you have a bad/broken ground wire in the harness, ohm out the green ground wire and see what happens, should be a simple fix after that...hope this helps.\
HANK
hank77 is offline   Quote Quick Reply
Old 11-18-2010, 01:20 PM   #10
Newb
 
Join Date: Nov 2010
Posts: 6
Will work that out

Quote:
Originally Posted by hank77 View Post
Brand new to the forum, former Ford mechanic, very common, sounds like you have a bad/broken ground wire in the harness, ohm out the green ground wire and see what happens, should be a simple fix after that...hope this helps.\
HANK
Thanks. I believe you are correct. I have spent much time on this and your statement makes perfect sense. I will check this out tomorrow as I will have more time then. Any thought on how it could be grounded easily (without gutting the whole dash)? Thanks again.
jambo is offline   Quote Quick Reply
Old 11-19-2010, 04:25 PM   #11
Newb
 
Join Date: Nov 2010
Location: Hooksett,New Hampshire
Posts: 6
Quote:
Originally Posted by jambo View Post
Thanks. I believe you are correct. I have spent much time on this and your statement makes perfect sense. I will check this out tomorrow as I will have more time then. Any thought on how it could be grounded easily (without gutting the whole dash)? Thanks again.
Depends on where it is broken, if you can access the ground wire you can use a frame ground near the blower. Or just do it the old fashioned way and check along the harness,\. Look for spots where it goes through the fire wall or pinch areas...good luck.
HANK
hank77 is offline   Quote Quick Reply
Old 12-11-2011, 09:56 PM   #12
Jeeper
 
dillinghamte2's Avatar
 
Join Date: Mar 2011
Location: South Korea
Posts: 36
switch and pigtail

jambo;

where did you get the switch and pigtail, my connecter was melted and having a hard time finding one.
Here in korea and need email or phone number to call the parts place.
Thanks.
dillinghamte2 is offline   Quote Quick Reply
Old 09-16-2012, 04:55 PM   #13
Jeeper
 
Driver831's Avatar
 
Join Date: Feb 2011
Location: Jax Fl
Posts: 413
bumping this thread. what was the end result? because I have the EXACT same problem with my 2000 TJ
Driver831 is offline   Quote Quick Reply
Old 09-16-2012, 08:03 PM   #14
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: California/Nevada
Posts: 1,443
This is an old thread so you may not get the OP to answer but if you have power to the blower (fan) motor then you are losing your ground. The motor is speed controlled from the ground side of the circuit through the resistor block, the speed switch & the mode switch. Any of these 3 components may be bad but often it’s one of the connectors or the wiring that overheats & you can see melting if you check closely. Sometimes one of the terminals is “loose” fitting inside the connector & arcs causing loss of contact so careful inspection is needed. Read this thread for detailed troubleshooting of the circuit. In post #3 there is a link to a knowledge base that has FSMs & you can see the wiring diagram for the circuit there. Read the first 10 posts & I think they will help find your problem.



http://www.wranglerforum.com/f5/blow...rk-182590.html

__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Heater Blower Switch- No Power!!!???!!! XGARDX TJ General Discussion Forum 2 09-06-2011 11:44 PM
2000 tj blower motor gizmo347 TJ Tech Forum 1 03-08-2010 11:36 AM
2000 Jeep TJ Blower Resistor Gonda TJ Tech Forum 2 02-20-2010 07:37 PM
99 Wrangler Blower motor Segrat1 TJ Tech Forum 2 08-17-2009 10:12 AM
Heater / Blower Problem 2000 Wrangler dougman1971 TJ Tech Forum 0 09-17-2008 08:56 AM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 06:18 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC