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  #1  
Old 07-20-2016, 09:40 AM
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Intermittent Blower Failure

Hello all,

My 2004 GC's a/c - heater blower is failing intermittently. I will start the Jeep and the air blows fine, then without rhyme or reason it completely stops (there is no specific duration between work/failure). Depending on the length of the trip, it may come back on again. I replaced the blower motor resistor and I thought that fixed the problem, but unfortunately it did not.

The only thing of note I can add other than the on/off again issue is that the air more often than not changes operational status after turning off the ignition - e.g. vents on while driving...vents off when I restart and the reverse.

Any info would be tremendously appreciated!!

Thanks in advance!!

Steve

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Old 07-20-2016, 05:26 PM
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Re: Intermittent Blower Failure

Most of the time the problem is a melted connector on the blower motor controller, but you changed that one already and would have seen the melted connector. When it fails again, i would try and wiggle a bit with the wiring on the controller and the blower motor itself. Could be a bad contact or an internally broken wire.
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Old 07-20-2016, 06:58 PM
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Re: Intermittent Blower Failure

how about wiggling the wire if it is running to see if it stops. Have you tried different settings of the fan when it shuts off?
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Old 07-20-2016, 07:21 PM
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Re: Intermittent Blower Failure

The connector on the resistor looked fine. I made it a point to look at it closely so I don't think that's the problem.

I've not tried the wire wiggle, but I will. May I ask how to access the blower motor connector (where it is located)?

As for the fan speeds - when it cuts off all speeds are dead.

Thanks for the suggestions guys - much appreciated!
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Old 07-21-2016, 11:08 PM
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Re: Intermittent Blower Failure

The blower motor sits right next to the resistor or controller (resistor is for manual AC, controller is for automatic AC system), so the connector can be found on the blower motor itself.
Since the state of the blower changes after switching ignition off/on, the problem can be inside the AC control panel.
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Old 07-22-2016, 04:11 AM
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Re: Intermittent Blower Failure

"The blower motor sits right next to the resistor or controller (resistor is for manual AC, controller is for automatic AC system), so the connector can be found on the blower motor itself.

I have manual a/c. So to be clear you are saying to remove the resistor and I will find the blower motor inside of the plenum or should I trace back (follow to the motor) the harness of the resistor externally?

"Since the state of the blower changes after switching ignition off/on, the problem can be inside the AC control panel."

Could you be more specific please; I have no idea what to look at or for based upon that statement.

Thanks for the help!
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Old 07-22-2016, 12:55 PM
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Re: Intermittent Blower Failure

If you look up in the passengers foot well, you can see the resistor and besides it the blower motor. The motor is fixed with 3 screws. Just wiggle all visible wires and see what happens.
If the problem is inside the AC control panel, then there is most probably not much to do then replacing the panel. Maybe that you can open the panel and check for loose solders or loose wire, but i have never opened it up myself.
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Old 07-22-2016, 04:02 PM
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Re: Intermittent Blower Failure

In my Jeep, there is a plenum cover that I think I need to remove in order to see the exposed blower ( http://www.jeepkj.com/forum/f202/how...ssembly-35659/).

Today, after the blower stopped amid a short drive, I pulled over and gave the area near the resistor a good bang with my fist and the thing came back on. Either something's loose or the motor itself is shot me thinks.

Any further insight is appreciated more than words can express!
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Old 07-22-2016, 06:24 PM
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Re: Intermittent Blower Failure

It seems the fist-rop I gave the plenum has temporally remedied the blower issue; I've just returned from an hour+ drive and it was blowing like a champ without interruption...that is until...

I live in a hilly area. When I ascend the rather long winding incline (total distance 1.5 miles or so) the blower continues to run, but nothing escapes from the vents. However after leveling out, the airflow returns instantly - ponderous!!
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Old 07-22-2016, 08:42 PM
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Re: Intermittent Blower Failure

This is typical of a vacuum leak or failure of the vacuum check valve. When you ascend the hill, you loose vacuum from the engine and the A/C vacuum controls loose suction so the vents can't remain open. Most systems then default to defrost vents. I don't know where the vacuum check valve is on your year but sometimes you can find it by tracing the vacuum lines and find the line that feeds the A/C.


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Old 07-23-2016, 04:45 AM
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Re: Intermittent Blower Failure

pbruecken,

I thought the hill ascension thing was of significance. May I ask...am I looking at two issues now (blower motor and/or connector issue PLUS the vacuum problem) or do you think the vacuum issue would account for the entire host of issues?

Thanks!!
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Old 07-23-2016, 07:11 AM
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Re: Intermittent Blower Failure

Quote:
Originally Posted by Steve 711 View Post
pbruecken,

I thought the hill ascension thing was of significance. May I ask...am I looking at two issues now (blower motor and/or connector issue PLUS the vacuum problem) or do you think the vacuum issue would account for the entire host of issues?

Thanks!!
This should be two separate issues. The blower motor is completely electrical and the mode door actuator is vacuum controlled.
By the way, the link you posted on the blower motor replacement is not for the WJ. The WJ does not have any cover over the blower motor, you can see it when looking up in the footwell area. Attached page shows how it looks like, eventhough it shows it as seen from the front side, which ofcourse you can not see.
Attached Files
File Type: pdf WJ blower motor.pdf (91.3 KB, 4 views)
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