O5 TJ Rubi - sometimes dash air blows low volume.. - Rubicon Owners Forum
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post #1 of 11 (permalink) Old 07-02-2019, 03:11 AM Thread Starter
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O5 TJ Rubi - sometimes dash air blows low volume..

Most often bliws ok, but sometimes the dash air blows noticably weakly. Change the switch from recirculate, to other positions, and one can hear the ducting change and the air redirects as it should. Shut off the engine, restart - still no joy. Run the fan speed up and down, air flow changes but is still weak.

Then the next time its driven and all is ok - blows strongly.

Anyone encounter this? Suggestions?

Vince

05 TJ Rubi (auto) / RE 3.5 SF / JKS BL&MML / Old Man EMU Shocks / Currie Anti-Rock, Steering, Track Bars / Alloy Axles / Talon CV Driveshafts / Nitto 33x13.5 Mud Grapplers / 15x10 Eagles / Jeeperman Skidz / SkidRow Engine-Trans Skid / MileMarker Winch / RockHard Front & ProComp Rear Bumpers / Ravelco Security / CO2 Tank / CB+HAM

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post #2 of 11 (permalink) Old 07-02-2019, 09:10 AM
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Only thing I can think of is look in the FSM and run the wiring down. Could be the blower motor itself I suppose. One thing you can try is to remove that plate (forgot what it's called) between the hood and windshield and take off the plastic plenum to expose the motor and squirrel cage wheel. Make sure the squirrel cage is free to rotate.
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post #3 of 11 (permalink) Old 07-02-2019, 10:30 AM
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Blower fan resistor maybe? Have had to replace mine twice, similar symptoms.

- DAA
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post #4 of 11 (permalink) Old 07-02-2019, 10:32 AM
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Could be that your a/c coil is freezing. Make sure the drain line is clear.
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post #5 of 11 (permalink) Old 07-04-2019, 06:11 AM
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Is the blower changing speed or just the volume, if volume maybe a mouse nest or wasp nest. Leaves?

I had a very industrious mouse move all of my rat poison from the top of my cabinet to inside the breather on my Grizzly 700, he ran out if mojo at some point, but still had the entire bottom covered in green pellets, took me 30 seconds on staring in preponderance to figure out what was in my breather box. Then minutes to marvel at the efforts.

I have not looked at this, but maybe consider sticking a shop vac up to it and see what you can get out?
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post #6 of 11 (permalink) Old 07-05-2019, 04:40 AM Thread Starter
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Blower stays same speed - volume drops.

Vince

05 TJ Rubi (auto) / RE 3.5 SF / JKS BL&MML / Old Man EMU Shocks / Currie Anti-Rock, Steering, Track Bars / Alloy Axles / Talon CV Driveshafts / Nitto 33x13.5 Mud Grapplers / 15x10 Eagles / Jeeperman Skidz / SkidRow Engine-Trans Skid / MileMarker Winch / RockHard Front & ProComp Rear Bumpers / Ravelco Security / CO2 Tank / CB+HAM

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post #7 of 11 (permalink) Old 07-11-2019, 10:45 AM
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I have the same issue but it is rare and it mostly appears when I have been driving (more like idling) all day thru the National Forest roads. I have swapped the hvac control panel and it did not fix the issue.

The last time if happened it lasted a few weeks (rubi is not my dd) but I disconnected the vacuum connector behind the glove box, could hear the air movement and re-connected. All fixed. I have not had this issue in a few months.


To me it is like the system is stuck in off mode so you do not get air thru the vents but you can still hear the doors open and close as you move the mode knob. I have had this on and off issue since the I bought the jeep brand new in March 2006. first time it happened was September of 2006. September is when grouse hunting opens in WA state and I idle up and down forest roads looking for gravel chickens
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post #8 of 11 (permalink) Old 08-12-2019, 07:56 PM
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My 2006 LJ A/C has quit for now, it use to run then quit and come back on. No fan on any speed I can hear the blend doors changing position as I move the selector switch but nothing. When it does run it blows cold tried jumping low pressure switch,nothing . Hesitant to buy a new panel as the 2005-2006 panels are in the $500 range for some reason. Maybe try a new blower resistor? Anyone know why we cant use the cheaper 1997-2004 panels any coversion?

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Last edited by rockinw; 08-12-2019 at 07:59 PM.
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post #9 of 11 (permalink) Old 08-16-2019, 10:33 PM
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Quote:
Originally Posted by rockinw View Post
My 2006 LJ A/C has quit for now, it use to run then quit and come back on. No fan on any speed I can hear the blend doors changing position as I move the selector switch but nothing. When it does run it blows cold tried jumping low pressure switch,nothing . Hesitant to buy a new panel as the 2005-2006 panels are in the $500 range for some reason. Maybe try a new blower resistor? Anyone know why we cant use the cheaper 1997-2004 panels any coversion?

When I first read your post, I thought it was a typo, so I checked and was floored that it was not. I had bought one about 18 months ago for under $150.00, installed it and it turned out that it was something else (a hole in my vacuum line.) Just to be on the same page, we are talking 55056558ab, yes?


The fan speed resistor fails in a very predicable way. First the slowest speed does not work any more, then the next slowest speed fails, then the next slowest speed fails, then it's just full blast.


And to answer your other question, there is a difference in the driver-side selector switch, the earlier unit is squarish and the latter switch is round. See my next post about the pin-outs.


/herb
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Last edited by zouaveherb; 08-16-2019 at 11:26 PM.
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post #10 of 11 (permalink) Old 08-16-2019, 11:11 PM
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rockinw,

So don't take this as gospel, but...


I took a look at the connector diagram from a 2004 service manual and compared it with one from a 2005. I think you "might" be able to get away with it.


The positions are the same, but if there is any variation in connector blade positioning, width, length, or thickness, you would have to make 5 little converter cables to go from the mismatched male side to the mismatched female side.

Also, I can't say for sure if there is or is not anything "special" with the new design. Like a resistor or something else that was added to address a problem with the 2003-2004 model year. There was a major change with regards to the manual transmission (that's why the "it's time to up-shift" light stopped working between the 2004 to 2005 models.) Dunno if there was a cascade effect with regards to the computer or anything else.

PNGs attached.


/herb
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File Type: png 2005.png (55.1 KB, 3 views)
File Type: png 2004.png (64.9 KB, 3 views)
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Last edited by zouaveherb; 08-16-2019 at 11:34 PM.
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