Heater Blower Switch- No Power!!!???!!! - 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 09-24-2009, 02:39 PM   #1
Join Date: Jul 2009
Posts: 7
XGARDX is on a distinguished road
Heater Blower Switch- No Power!!!???!!!

ok, so the 99 TJ Sahara (4.0 6cyl. 5spd manual, A/C equiped) Jeep i bought this summer hasn't had the blower or climate controls working since i got it. finnaly getting cold and i decided to try and fix it.

I've read through the diff threads on here already and run through the normal issues and corrected them. as i'll list below, but the main problem i'm finding is that i do not get power to the blower speed switch from the relay thats under the dash.

i have check through:
-replaced actually blower speed select switch( it was bad)
- no noticable burn/melting on any harnesses in the dash controls.
-swapt out and tried in a friends working 98 TJ, both the relay and resistor (or whatever its called with the coil spring resistors to control fan speed)
-pulled the blower motor, it works when 12V is hooked straight to it
- now after taking the volt meter through out the system points i've found power going from:
fuse panel-relay, comes out 2 different points of the relay, BUT i noticed that on my relay harness it does not have the middle 5th wire like on my friends 98 TJ.

is this just a wiring difference between years when they switched control panels/parts and whatnot???

from there-i do not get any power to the switch in the dash to even send to the blower.

anyone with a 99 or same style wiring that can check if there is 4 or 5 wires that are in their relay harness.

i didn't see anything that looked like the wire burned up/ melted away on the harness.

but who knows what the previous owner did to it ?
XGARDX is offline   Quote
Old 09-06-2011, 08:32 PM   #2
Join Date: Sep 2011
Posts: 1
dalelezu is on a distinguished road
I have the same issue:
replaced the climate control panel
Replaced resistor
Hooked up blower motor direct (works Fine)

But I have no power to the fan control after checking with circuit tester.

Anyone have any idea what's going on? I wired direct to battery to at least have "High" blower.


dalelezu is offline   Quote
Old 09-06-2011, 10:44 PM   #3
Shelby427's Avatar
Join Date: May 2011
Location: Lakeland FL and Hooversville PA
Posts: 2,379
Shelby427 is on a distinguished road
Gotta ask, just in case, did you check BOTH fuses? One in the under hood power distribution center and one in the mini box. Takes both for the blower controls.

Anyhow, looking at the wiring diagram, your relay on a 99 is a 4 terminal.
Power from both fuses to two of the terminals, a ground to another and the power feed out to the blower motor from the forth.

Similar to a standard 4 terminal Bosch relay. Power in to run the blower, power for the trigger, a ground, and power out to the blower.

From the looks of it the relay is hot all the time with the ignition on. Again to the motor, not the switch.

The resistor (springs) control the ground to the motor via the switch to control speeds. The switch just makes the connection to the various resistance springs to a direct ground.

The switch gets it's ground connection from the mode switch.

Only place I spotted a power lead going to the control head was for illumination and to work the blend door.

Hopefully this link works, you'll want page 8w-42-3 for the blower motor/controls schematics. Give it a bit, it takes a little time as it's loading all the wiring diagrams.

Jeep Knowledge Base
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.
Shelby427 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
Auxillary Lighting Install Writeup erickpl General Jeep FAQ/Stickies 15 09-20-2013 09:28 AM
Defrost selector switch and blower motor Moparnut TJ General Discussion Forum 8 02-26-2012 08:19 PM
heater blower resistor pack? mnstrbetle TJ Tech Forum 7 02-07-2011 04:50 PM
Auxilary Lighting Writeup erickpl TJ Tech Forum 2 01-06-2011 07:50 PM
weird heater switch problem fr87hn TJ Tech Forum 4 04-19-2007 12:36 AM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:52 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 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
« Back

Enter your email address:

Delivered by FeedBurner