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Unread 12-30-2013, 04:21 PM   #1
Burtman88
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1987 YJ Wrangler 
 
Join Date: Jan 2010
Location: Palatine, illionois
Posts: 432
Heater Blend door problems Please Help

so i have been having a problem with my heat on my Wk past month. Last month the passenger side heat stopped working and is only blowing out cold air. The driver side is putting heat out. The rear vent are also putting out cold air. so i looked it up it can be the actuator that's not working anymore or it can be the blend doors. It has been alright for the past month until i had to sit passenger in my jeep since we were switching driving on a long trip. On the way back it was -10 out all i have to say is wow worst experience i have had in my jeep. So is there a diagram where so i can try to fix this myself. I want to first make sure it's not the actuator. While i was getting a new key programmed this week at the stealership, i asked them how much to fix it they quoted me over a grand.

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87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15

00 WJ

09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18
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Unread 12-30-2013, 04:45 PM   #2
WieSeL
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Join Date: Mar 2013
Posts: 472
Take a look under the dash by the Back of the stereo on the side of the HVAC housing. Move the temperature from hot to cold and back again and see if the actuator is working.
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Unread 01-01-2014, 09:10 AM   #3
lavern23
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2005 LJ Wrangler 
 
Join Date: Apr 2011
Location: Louisville, KY
Posts: 84
Mine did the same thing about a month ago. It was the recirc door that is behind the glove box. The gear was broke. A new gear is 16.00 at the dealership. It's about a 20 minute fix with the new part.

You take the glove box door assy out.

Take the torx screws off holding on the actuator and the gear is in between the actuator and the door arm.

68072190aa is the part I used.

Excellent pics in the link below

http://www.cherokeesrt8.com/forums/s...ad.php?t=64973
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Unread 01-01-2014, 10:45 AM   #4
johngreen1234
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2010 WK 
 
Join Date: Nov 2012
Location: beverly hills, ca
Posts: 296
OP is describing a problem with the "Blend door" actuation, I think, not the Recirculation "Mode door" located behind the glove box. He can check all of them if he doesn't mind crawling around with a flashlight. Since I have a problem with my Blend door, I have become familiar with all these critter-doors and their hiding places. Here we go:

--Mode door. Probably not, but it's easy to pull the glove box and watch while you fiddle with the HVAC controls. I would look first before I bought the $10 part--it just doesn't sound like it.

--Blend door(s). If you have dual zone you have two of these, one on each side of the air box. If you have single zone like me, you only have one on the driver's side. The air box is a tall black thing straight behind the radio. It is as wide as the radio but as tall as the console area, and more difficult to remove than a kidney stone. There are no actuator gears here, like the Mode door. You can replace the actuator pack and see if it helps, or you can pay a dealer $2,000 and let them remove your whole dash and replace the airbox unit.

--Air door. This is on the driver's side of the airbox, above and behind the driver's Blend door. IIRC it controls the front/rear heat dist, or something like that. When you fiddle with all the switches you should see it moving or at least hear it clicking.

When I was googling "Blend door" I found a lot of talk and pix about the "Mode door" actuator gear and how easy it is to replace, which it is. But unfortunately it usually isn't the problem. This door controls whether the fan draws air from the outside, or air from the inside, and nothing else.
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Unread 01-02-2014, 10:03 AM   #5
Burtman88
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1987 YJ Wrangler 
 
Join Date: Jan 2010
Location: Palatine, illionois
Posts: 432
Thanks a lot for your help guys. Ill check it out soon when i have free time this weekend. Its getting annoying only defrosting half my jeep
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87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15

00 WJ

09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18
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Unread 01-14-2014, 07:42 PM   #6
ISUzj
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2005 WK 
 
Join Date: Feb 2008
Location: TheMoines, Iowa
Posts: 747
My drivers side heat works perfectly fine but my passenger and rear is cold air. I can divert the air any direction I want. I just need to know where the heat comes from.

wouldn't it be great if there was an actual diagram of the HVAC on the net? everything seems to only relate to the WJ's

My mode door is working fine (unfortunately) and I can feel the actuator move on the pass side down low (the shaft part)
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94ZJ 5.2 Red; Rusty's 3" Coils,Skyjacker hydro's, Brush Guard, Custom Rear Bumper, Custom Roof Rack, KVG Quick Discos, 31-10.50-15's DAYTON TIMBERLINE A/T OBA 2 Gallon tank
Can't buy it? BUILD IT!! Do it cheap too cuz your in college

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Unread 01-14-2014, 09:27 PM   #7
Jaashua
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2005 WK 
 
Join Date: Feb 2013
Location: Rome, New York
Posts: 1,090
I only have the default defrost. It has always been like this. I have recailibrated it and it changes vents but always goes back to defrost. What one is my problem?
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Unread 01-15-2014, 06:55 AM   #8
ISUzj
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2005 WK 
 
Join Date: Feb 2008
Location: TheMoines, Iowa
Posts: 747
well I messed with it some again last night, and when I adjust the drivers side temp, I hear a whirr that gets long and low, like a door is pressing against something. The passenger side I hear an actuator move, but no low noise like it is pushing down on anything.

my gear behind the glovebox doesn't seem to be broken at all, so by deduction it must be my passenger blend door.

It helps to disconnect the fan power behind the glovebox when you are messing, it makes it much easier to hear actuators moving.

Also I found something that helps some on the cold temps. At least on dual temp control;
1)Adjust the postion to front/floor split turn the heat to 78 deg on both of them,
2) hit the A/C button and then the recirculate button
3) turn off the A/C. that way it will keep the recirculator door shut and over time the air coming out of the pass side and rear wont be ice cold, just cooler.


Edit: putting this here for later, apparently a few commanders have had the same issue:
http://www.jeepcommander.com/forums/...ad.php?t=13592
__________________
Can't wait to get started, but my wallet can......
~~~_______oooo_
~~ / ../...\...\_____\
~~[_---_____---_\-\\\\\\-\
~~~(o) )-o---(o) )-o---) )
94ZJ 5.2 Red; Rusty's 3" Coils,Skyjacker hydro's, Brush Guard, Custom Rear Bumper, Custom Roof Rack, KVG Quick Discos, 31-10.50-15's DAYTON TIMBERLINE A/T OBA 2 Gallon tank
Can't buy it? BUILD IT!! Do it cheap too cuz your in college

My Build Thread Align your jeep yourself B N B#175
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