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  #1  
Old 09-12-2011, 06:15 PM
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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.
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  #2  
Old 09-12-2011, 09:13 PM
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get a test light and check for the power and grounds at the resistor and the motor itself
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Old 09-13-2011, 07:50 AM
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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?
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Old 09-13-2011, 03:10 PM
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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.
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Old 09-13-2011, 07:46 PM
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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.
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Old 09-15-2011, 09:48 AM
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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.
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Old 09-15-2011, 09:58 AM
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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.
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Old 09-15-2011, 07:20 PM
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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.
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Old 09-16-2011, 08:26 AM
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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.
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  #10  
Old 09-16-2011, 10:47 AM
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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.
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Old 09-16-2011, 10:47 AM
 
 
 
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2004, blower, change, chrysler, climate, control, duralastac, fan, front, heater, pacifica, problem, replace, running, setting, switch, time, working

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