Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 01-05-2011, 06:59 PM
New Member
My Jeep: 1999 4.7L WJ
 
Join Date: Jan 2011
Location: Newmarket UK
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Rottweiler123 is on a distinguished road
99 WJ Blower fan runs constantly

The heater blower fan on my 99 WJ runs all the time so I have to pull the fuse to get it to quit. Anybody know whats causing this?
__________________

__________________
Reply With Quote
  #2  
Old 01-06-2011, 12:05 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,917
Thanks: 9
Thanked 92 Times in 87 Posts
Rep Power: 525871
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 99 WJ Blower fan runs constantly

Depending on which system you have ( Automatic Zone Control or manual control), it is probably the blower motor controller or resistor block respectively.
__________________

__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 01-06-2011, 01:00 PM
New Member
My Jeep: 1999 4.7L WJ
 
Join Date: Jan 2011
Location: Newmarket UK
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Rottweiler123 is on a distinguished road
Re: 99 WJ Blower fan runs constantly

Quote:
Originally Posted by Frango100 View Post
Depending on which system you have ( Automatic Zone Control or manual control), it is probably the blower motor controller or resistor block respectively.
Thank you for your reply. I have the AZC setup and having looked under the glove compartment it looks as though the control box has been replaced at some time or another. I shall get it tested and see if this replacement is faulty.
__________________
Reply With Quote
  #4  
Old 01-06-2011, 07:39 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,917
Thanks: 9
Thanked 92 Times in 87 Posts
Rep Power: 525871
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 99 WJ Blower fan runs constantly

You could try to find error codes yourself with the AZC system: You most probably get 03 or 04, which has to do with the Fan control. You could clear the memory by disconnecting the car battery for a minute or so and check if the fan works ok.

ENTERING THE AZC SELF-DIAGNOSTIC MODE
To enter the AZC self-diagnostic mode, perform the
following:
(1) Depress the a/c and recirc buttons at the same
time and hold. Rotate the left temperature control
knob clockwise (CW) one detent.
(2) If you continue to keep the a/c and recirc buttons
depressed, the AZC control module will perform
a Segment Test of the Vacuum Fluorescent (VF) display.
In the Segment Test you should see all of the
display segments illuminate as long as both buttons
are held. If a display segment fails to illuminate, the
vacuum fluorescent display is faulty and the a/c
heater control must be replaced.
(3) After viewing the Segment Test, release the
A/C and Recirc buttons and the display will clear
momentarily.
If a 0 is displayed, then no faults
are set in the system.
Should there be any faults,
either
currentor historical, all fault codes will be
displayed in ascending numerical sequence (note no
effort is made to display fault codes in chronological
order). Each fault code is displayed for one second
before the next code is displayed. Once all fault codes
have been displayed, the system will then repeat the
fault code numbers. This will continue until the left
side set temperature control is moved at least one
detent position in the CW direction or the ignition is

turned
OFF

When you are in the self diagnostic mode , you can also enter into the actuator test mode. Turn the left temp knob so that pointer number 02 is shown (that one is for the Fan), and pressing the A/C or Recirc button will put the system into the actuator test mode. By turning the RH temp knob, you should be able to control the fan speed. If this works, then you know that the Fan controller is ok and that the problem is probably somewhere in the panel/switch.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #5  
Old 12-12-2011, 06:21 PM
New Member
 
Join Date: Dec 2011
Posts: 2
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
Robert G Beals is on a distinguished road
Re: 99 WJ Blower fan runs constantly

Thanks, I did not know about the ACTUATOR TEST MODE when using the AZC self-diagnostic mode.
__________________
Reply With Quote
  #6  
Old 12-15-2011, 12:45 AM
Gus9890's Avatar
Premium Member
My Jeep: 2001 4.0L WJ
 
Join Date: Apr 2011
Location: Amelia Island, FL
Posts: 4,473
Thanks: 38
Thanked 48 Times in 47 Posts
Rep Power: 408132
Gus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond reputeGus9890 has a reputation beyond repute
Re: 99 WJ Blower fan runs constantly

Also could be a relay
__________________

__________________
2001 Silverstone Metallic WJ Limited:
Gen III Clear/Chrome Projector/CCFL Halos/LEDs, 8K HIDs, 8K HID Projector/Halo fogs, Clear/Chrome Tail Lights and 3rd Brake Light with LEDS, Diamond Mesh Upper and Lower Fascia, Spectre CAI, Breather Filter, Cabin Air Filter, Low-Temp Thermostat, Jet Stage 1 Chip, MagnaFlow Exhaust with Resonator Tip, Shorty Antenna, Front/Back De-badged
Reply With Quote
Reply

Thread Tools
Display Modes

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
Blower motor issues peepersjeepers Troubleshooting/Problems Discussion 3 02-14-2011 10:39 AM
A/C blower savannahgrandcherokee Troubleshooting/Problems 4 09-14-2010 09:15 PM
Hemituner runs 10.8 pjs1965 At The Track 7 06-07-2010 07:09 PM
** My ATCO runs today (12-12-09) ** QBNKID At The Track 10 12-14-2009 08:19 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 06:35 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community