Front fan issue / on high speed all the time - Chrysler Forum - Chrysler Enthusiast Forums

Go Back   Chrysler Forum - Chrysler Enthusiast Forums > Chrysler Vehicles > Chrysler Pacifica
Search


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 09-12-2011, 06:15 PM
Junior Member
 
Join Date: Sep 2011
Posts: 5
Default Front fan issue / on high speed all the time

I own a 2004 Chrysler Pacifica, and the front fan stopped working. I replaced the front blower motor resistor with three (3) new ones. I know the man at the local AutoZone who took them back. Replacing this unit with a new one did not fixed the problem.

What I discovered if I run a wire between the negatives of the blower motor resistor (black to black/orange wires) the fan stay on high speed and nothing on the control unit (changing the fan speeds or turning the unit on/off) changes the fan speed from being on high.

Do you know what the issue is with my car? I am clueless at this point.
Reply With Quote
  #2  
Old 09-12-2011, 09:13 PM
CHRYSLER TECH's Avatar
Super Moderator
 
Join Date: Mar 2006
Location: Norcross GA
Posts: 7,395
Send a message via AIM to CHRYSLER TECH Send a message via Yahoo to CHRYSLER TECH
Default

get a test light and check for the power and grounds at the resistor and the motor itself
__________________
Dealer trained Tech 15 years Now Proud Owner operator Kevin's Mobile Repair in ATLANTA. Repairing Chrysler,Dodge and Jeep
KKeller608@aol.com
http://kevinsmobilerepair.com
Reply With Quote
  #3  
Old 09-13-2011, 07:50 AM
Junior Member
 
Join Date: Sep 2011
Posts: 5
Default By testing this

I will test power and grounds at the front blower motor resistor and fan motor and this weekend? By testing this, what am I trying to narrow down to be my problem i.e. a bad fan motor or something else?
Reply With Quote
  #4  
Old 09-13-2011, 03:10 PM
CHRYSLER TECH's Avatar
Super Moderator
 
Join Date: Mar 2006
Location: Norcross GA
Posts: 7,395
Send a message via AIM to CHRYSLER TECH Send a message via Yahoo to CHRYSLER TECH
Default

power will be there all the time ground will come from the ac control head through the resistor unless u have the auto temp control them its pulse with modulated and u cant test it.
__________________
Dealer trained Tech 15 years Now Proud Owner operator Kevin's Mobile Repair in ATLANTA. Repairing Chrysler,Dodge and Jeep
KKeller608@aol.com
http://kevinsmobilerepair.com
Reply With Quote
  #5  
Old 09-13-2011, 07:46 PM
Junior Member
 
Join Date: Sep 2011
Posts: 5
Default

I appreciate you taking your time in helping me resolve my problem. My car has an automatic climate control with dual tempature.
Not sure what my next step should be.
Reply With Quote
  #6  
Old 09-15-2011, 09:48 AM
Member
 
Join Date: Mar 2008
Posts: 43
Default

Hi.
If you have the auto-climate control, fan speed is not controlled with a simple resistor pack.

It is a pulse-width modulated 'Blower Control Module' like this:

CARAVAN TOWN COUNTRY BLOWER MOTOR RESISTOR MODULE MOPAR | eBay

The typical failure mode is that the fan runs uncontrollably at high speed regardless of the the manual setting - you'll see the 'speed bars' on the display change, but the fan will run full speed.

Remove/replace procedure is the same as the resistor pack.
Reply With Quote
  #7  
Old 09-15-2011, 09:58 AM
Member
 
Join Date: Mar 2008
Posts: 43
Default

And...the failure is usually the MOSFET power transistor in the module. If you are handy with a soldering iron and so inclined, look up online or visit your local electronics supply house and buy a Fairchild N-channel MOSFET part number HUF75343P3.

The MOSFET will cost you ~$2.00-$3.00
The entire module is $50-$100.

I have repaired several with good results and no further issues.
Reply With Quote
  #8  
Old 09-15-2011, 07:20 PM
Junior Member
 
Join Date: Sep 2011
Posts: 5
Default

Goldsmi -

I purchase and tried three (3) new blower motor resistors, and "the typical failure mode of the fan running uncontrollably at high speed regardless of the the manual setting - l do see the 'speed bars' on the display change, but the fan will run full speed." Still happens.

The only twist to make the typical failure happen is that I need to run a wire between the negatives of the blower motor resistor (black to black/orange wires). If I do not run the wire, the fan does not blow at all.
Reply With Quote
  #9  
Old 09-16-2011, 08:26 AM
Member
 
Join Date: Mar 2008
Posts: 43
Default

Please clarify - You stated previously that you had auto climate control - You need the 'Blower Control Module'. You should not be trying to use the resistor pack.
Reply With Quote
  #10  
Old 09-16-2011, 10:47 AM
Junior Member
 
Join Date: Sep 2011
Posts: 5
Default a/c Heater blower control switch

The part I replaced three times is the a/c Heater blower control switch. Below is the link.

Duralast/A/C Heater Blower Control Switch (JA1623) | 2004 Chrysler Pacifica AWD 6 Cylinders 4 3.5L SFI SOHC | AutoZone.com_

I do have automatic climate control with dual control.

The only way for me to make my fan run on high and have the typical failure you described is to run a seperate wire between the negative (black to black & orange) of this switch.

Not sure why the grounds are not connect between the two plug in on this unit.
Reply With Quote
 
 
 
Reply



Tags
2004, blower, change, chrysler, climate, control, duralastac, fan, front, heater, pacifica, problem, replace, running, setting, switch, time, working

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
airbag warning light on from time to time latreto Chrysler Voyager & Town & Country 17 07-19-2013 02:34 PM
Radiator fans - high speed failure Laimon Chrysler 200 & Sebring 12 03-29-2013 04:22 PM
2001 LXI high speed blower works only rye2 Chrysler 200 & Sebring 6 08-31-2012 09:31 AM
Long time Mopar fan! koehring New Member Area 0 03-22-2012 08:52 AM
99 T&C (LHD US IMPORT) 3.8l Front Blower only works on high speed! dm6174 Chrysler Voyager & Town & Country 5 11-11-2009 05:39 PM

Advertising
Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 03:56 PM.

Internet Brands, Inc.


Emails Backup