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Old 11-05-2010, 05:44 PM
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Blower Motor issue - it's friggen cold! Help!

Ok, I just got the WJ a couple weeks ago, havent had anytime to look at the HVAC till tonight. I ran the diagnostic on it, its an 02 ltd with AZC.

First check i got the following fault codes:

45,46,47,48,52,54,55,56

I cleared the codes and now the display reads "0" meaning no fault or issues found in the HVAC correct?

Soooooo, why doesn't the blower motor work? I checked the fuse panel under the hood, the 40amp fuse for the blower motor seems to be fine.

I havent replaced any parts or removed anything from the HVAC system. Could it be the blower motor control module?

Anyone have any advice?

On a positive note, I got some new toys for the Jeep and plan to install most items tomorrow. New sway bar end links, plugs, PCV, Air Filter, headlamp bulbs, do a little rust control under the doors and of course my Falkens came in tonight!

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Old 11-05-2010, 07:07 PM
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Re: Blower Motor issue - it's friggen cold! Help!

Quote:
Originally Posted by GiggityGiggity View Post
Ok, I just got the WJ a couple weeks ago, havent had anytime to look at the HVAC till tonight. I ran the diagnostic on it, its an 02 ltd with AZC.

First check i got the following fault codes:

45,46,47,48,52,54,55,56

I cleared the codes and now the display reads "0" meaning no fault or issues found in the HVAC correct?

Soooooo, why doesn't the blower motor work? I checked the fuse panel under the hood, the 40amp fuse for the blower motor seems to be fine.

I havent replaced any parts or removed anything from the HVAC system. Could it be the blower motor control module?

Anyone have any advice?

On a positive note, I got some new toys for the Jeep and plan to install most items tomorrow. New sway bar end links, plugs, PCV, Air Filter, headlamp bulbs, do a little rust control under the doors and of course my Falkens came in tonight!

Gig you do know that the blower wont run in heat mode till the engine coolant reaches a certain temp right? Not trying to be a smart ass but a lot of people don't know that. I didn't
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Old 11-05-2010, 07:27 PM
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Re: Blower Motor issue - it's friggen cold! Help!

Are you sure about the blower motor dave? I have never seen this on my jeep.
For sure when you put the blower motor in manual mode, it should run.
Some of the known blower motor issues are the connector on the blower motor (many times melted) or the controller itself.
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Old 11-05-2010, 07:54 PM
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Re: Blower Motor issue - it's friggen cold! Help!

Quote:
Originally Posted by Frango100 View Post
Are you sure about the blower motor dave? I have never seen this on my jeep.
For sure when you put the blower motor in manual mode, it should run.
Some of the known blower motor issues are the connector on the blower motor (many times melted) or the controller itself.
To be honest I dont think I've ever run mine in manual in winter The auto high and low have always worked well for me.As far as the temp thing I never let my Jeep warm up much because it's garaged(not heated) and in auto almost always the same place 1/4 mi down the road the blower turns on,ramps up and is already blowing warm air.
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OK, fine...I'll admit...some amber lamps are good, and necessary.
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Old 11-06-2010, 10:05 AM
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Re: Blower Motor issue - it's friggen cold! Help!

Quote:
Originally Posted by cheapjeep View Post
Gig you do know that the blower wont run in heat mode till the engine coolant reaches a certain temp right? Not trying to be a smart ass but a lot of people don't know that. I didn't
LMAO! Yeah, I checked to make sure it wasnt on auto.

I ran the diagnostic again last night on my way home from hockey and got codes 52,54 and 58 i think. I have to run it again to make sure. Will report back.
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Old 11-06-2010, 10:05 AM
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Re: Blower Motor issue - it's friggen cold! Help!

Quote:
Originally Posted by Frango100 View Post
Are you sure about the blower motor dave? I have never seen this on my jeep.
For sure when you put the blower motor in manual mode, it should run.
Some of the known blower motor issues are the connector on the blower motor (many times melted) or the controller itself.
yeah, will be checking the connector today now that theres light and its not frigid out.
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Old 11-06-2010, 10:19 AM
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Re: Blower Motor issue - it's friggen cold! Help!

K, so codes present:

52 = AI (Recirc) door travel range too large
54 = Left temperature door travel too large
56 = Right temperature door travel too large

none of those have anything to do with the operation of the blower motor.

I checked the connector to the module, by feel it seems good, surfaces are smooth. I wasn't sure how to unclip the plug and didnt want to break it. Its probably easier to just drop the module (two nuts) and then get at the plug. Regardless I'm still at a loss here.
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Old 11-06-2010, 10:36 AM
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Re: Blower Motor issue - it's friggen cold! Help!

holy crap! just called the dealer for a price on the module, they tell me its called a resistor (tomato tomatoe) $181 plus the harness which is required @ $125. I better be sure before I start swapping parts...
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Old 11-06-2010, 12:02 PM
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Re: Blower Motor issue - it's friggen cold! Help!

Regarding the fault codes, just try to calibrate the system using the next procedure:

1. Turn the ignition on. 2. Set the HVAC to auto. 3. Turn the ignition off. 4. Remove IOD fuse. Wait 90 seconds before reinstalling. 5. Start the vehicle. You will hear sound of the doors moving. 6. Do not touch any of the AZC controls for at least one minute to allow the calibration function to run to completion. This forces the system into a recalibrate the full open and full closed position of the doors.

Regarding the control module, the dealer doesn't know what he is talking about. On WJ's with the manual airco system, there is a resistor pack to control the different blower motor speeds, but on WJ's with the AZC system, its a pulse width modulating control module, which can regulate the blower motor speed from almost 0 until max.

There is a way to control the blower motor not using the manual/auto knob, not sure though if it would make any difference. Follow the procedure below and use code 03 to control the blower motor speed with the right temperature knob.

OUTPUT CIRCUIT/ACTUATOR TESTS
In the Output Circuit/Actuator Test mode, the output
circuits can be viewed, monitored, overridden,
and tested. If a failure occurs in an output circuit,
test the circuit by overriding the system. Test the
actuator through its full range of operation.
(1) To begin the Output Circuit/Actuator Tests you
must be in the Select Test mode.
(2) With a “00” value displayed in the Test Selector
and no stick man, turn the rotary temperature control
knob until the test number you are looking for
appears in the Test Selector display. See the Circuit
Testing charts for a listing of the test numbers, test
items, test types, system tested, and displayed values.
(3) To see the output value, depress the a/c or
recirc button. The values displayed will represent the
output from the AZC control module.
(4) To enter the actuator test, depress the a/c or
recirc button. Then, rotate the right temperature set
knob to the desired position.

Just to be sure that the problem is not the blower motor itself, you could disconnect the blower motor connector and use a volt meter to see if there is voltage (not sure which value you should see, but with blower motor selected in max most probably 12V)
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Old 11-06-2010, 04:02 PM
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Re: Blower Motor issue - it's friggen cold! Help!

Frango! I thought so too so I went to a local parts store and picked up a new control module and the blower motor works now

One thing, I'm not sure if the module that was in the truck was two prong or 3 and might of just broke. The one i installed is a 3 prong and the connector doesn't clip in. It just slide on a bit, its not secure at all. I wonder if there is a harness upgrade and Chrysler changed the module?

Besides that, i get more air out of the drivers side vents then i do the passenger side but the passenger side is much warmer. only cool air on the drivers side. would recalibrating fix that or is that possibly related to the module/harness not being properly connected? I would have to think the latter but after I calibrate we'll find out!
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Old 11-06-2010, 06:11 PM
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Re: Blower Motor issue - it's friggen cold! Help!

Well, recalibration didnt fix anything. Same problem. Reset the fault codes. Reads 0 again. Any other suggestions?
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Old 11-06-2010, 07:34 PM
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Re: Blower Motor issue - it's friggen cold! Help!

I think what is left now is just praying..............................

If you turn the left temperature knob, do you hear the blend door actuator moving? Try over the full temperature range if you can hear the actuator. When its at the end of its travel, you hear a different sound of the door touching its frame. Any difference in sound and time of motion of drivers side and passenger side blend door?
When you did the calibration, did you hear the blend doors and recirculation door moving? The fact that you have almost no warm air on the drivers side, tells us that the drivers side blend door probably doesn't open. The drivers side blend door actuator you can see when you remove the glove box. You could remove the actuator to see if the blend door itself is not stuck somewhere. Could be the actuator itself as well.
The fact that you have more air from the drivers side, could have to do with the fact that the air on that side is not passing thru the heater core and is less restricted. Never tested this on my car, by selecting hot on one side and cold on the other, but could be giving the difference.
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