99 Blower motor issue...HELP - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-09-2009, 09:26 PM   #1
cummings145's Avatar
Join Date: Aug 2009
Location: High Point, North Carolina
Posts: 13
99 Blower motor issue...HELP

I've got a 99 Wrangler where the blower motor for A/C and Heat doesnt work at all. I replaced the fan speed switch, no luck. Bought the blower motor resistor today, nothing still. Anyone with some help...I dont need a/c but my wife does!

cummings145 is offline   Quote
Old 08-09-2009, 09:33 PM   #2
Join Date: Aug 2009
Location: Huntingtown maryland
Posts: 162
hey, maybe the relay is bad, fuses? check for damaged wires..
let me know

wbrett1027 is offline   Quote
Old 08-09-2009, 09:39 PM   #3
cummings145's Avatar
Join Date: Aug 2009
Location: High Point, North Carolina
Posts: 13
I can feel/hear the relay pull in and the A/C Clutch kicks on..how can I test the blower motor?
cummings145 is offline   Quote
Old 08-09-2009, 09:41 PM   #4
jpdocdave's Avatar
Join Date: Mar 2008
Location: beach park, il
Posts: 8,162
pretty easy, back probe the power and ground wire at the motor. if you have power and ground at the blower motor, and its not blowing, you need a new blower motor. if power isn't there, then its not the blower motor.
"The danger to America is not Barack Obama but a citizenry capable of entrusting a man like him with the Presidency. It will be far easier to limit and undo the follies of an Obama presidency than to restore the necessary common sense and good judgment to a depraved electorate willing to have such a man for their president."
jpdocdave is offline   Quote
Old 01-08-2010, 04:55 PM   #5
Join Date: Jan 2010
Posts: 2
blower motor troubles 2000tj

ive replaced,switch,relay,fuse,,,still nothing,,,but why would i have positive [hot]reading on BOTH wires going to motor,instead 1 hot 1 neg or nothing on both??is this what happens if resistor is bad?was working fine,then i turned down the speed it went down as i turned it never came back on,,this is the second new switch ive tried
meallene is offline   Quote
Old 01-08-2010, 05:06 PM   #6
Knows a couple things...

WF Supporting Member
Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 39,678
+12v on both leads of the motor means it's not being grounded on the switched lead which means it won't run. One side is feeding the +12 to it and you're seeing +12 on the other side through the motor's coil inside. When the other side is grounded via one of the resistor pack's low/med/high speeds through the switch, it'll probably run. At this point I'm thinking a bad cable or perhaps a bad switch.

Think of providing 12 volts to one side of a bulb but not grounding its other side. The bulb won't light, you'll measure 12 volts on both of the bulb's connectors since the bulb's filament is conducting the 12 volts through to its other side. Ground the other side of the bulb and it will light up.
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 09-01-2010, 04:18 PM   #7
Join Date: Aug 2010
Location: South Houston,Texas
Posts: 4
My a/c blower motor does not work at all and after checking my switches I found I have no power at my on/off/selector switch and at my speed control switch. Is that a relay issue? If so how can I test the relay to tell if its bad or not?
FrankieT is offline   Quote
Old 05-12-2012, 04:41 PM   #8
davefewox's Avatar
Join Date: Jan 2012
Posts: 9
it appears that the horn and a/c relays are the same , swap them temporarily. also ck fuse 8 at fuse block and fuse 11 under hood in pdc

davefewox is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not 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
TJ Wrangler Auto Electric Help Regarding The Blower Fan? J.A TJ Tech Forum 8 01-03-2015 08:59 PM
tj blower motor and airbag problem 04tjsahara TJ General Discussion Forum 3 06-14-2010 02:20 AM
99 Wrangler Blower motor Segrat1 TJ Tech Forum 2 08-17-2009 10:12 AM
Replacing the AC/Heater Blower Motor 2006 TJ slyfox250 TJ Tech Forum 4 06-30-2009 08:31 PM
2002 Jeep Wrangler Blower Motor Wolfgang TJ General Discussion Forum 0 10-11-2007 02:29 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:29 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

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