My heater blower puts out more air when not running, here's why - JeepForum.com

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post #1 of 105 Old 12-26-2007, 07:04 PM Thread Starter
Nitrox73
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My heater blower puts out more air when not running, here's why

I've read about guys with jeeps that bake them out after a couple minutes and was jealous because mine didn't. My heater blower wasn't putting out any air hardly at all while the YJ was running. However, if I just put the key in and turned it without starting it, it blows very hard.

I used the search feature and couldn't find anything that covered this.

After checking voltages and other things, I pulled my hood vent cover off. It was spotless and had zero debris inside. I noticed that the vent intake door was open. When I started the jeep up it closed with the heater control on defrost/heat/vent. When I shut it off the door re-opened. Both intake vent doors are controlled by the vacuum switch attached to the heater controls. It has three ports and two vacuum tubes connected to it.

It turns out my tubes had been plugged into the wrong ports! So when the jeep was off the intake doors were open and when running the vacuum closed the doors so no air was coming in from the hood vent.

As the proud owner of jeep that no longer requires a hooded sweatswirt to stay warm in, I hope this post might help somebody else out.


Everybody knows.... It's hip to be square... Well at least square headlights!
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post #2 of 105 Old 12-27-2007, 05:11 PM
ctm
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Could you please post a picture or a diagram as to which tubes go to which port. All I know is that one is for the vacuum source on the intake manifold, one goes to the door, and the 3rd one is for A/C? Does that mean when you have A/C hooked up it is the one that _closes_ the door to recycle cool air?
Anyway, it would be cool to document this. It is not documented in the FSM or anywhere else as far as I can tell.
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post #3 of 105 Old 01-02-2008, 08:09 PM
V8Wrangler
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Yea someone how are these supposed to be hosed? Help a brother out!

Quote:
Originally Posted by Nitrox73
I've read about guys with jeeps that bake them out after a couple minutes and was jealous because mine didn't. My heater blower wasn't putting out any air hardly at all while the YJ was running. However, if I just put the key in and turned it without starting it, it blows very hard.

I used the search feature and couldn't find anything that covered this.

After checking voltages and other things, I pulled my hood vent cover off. It was spotless and had zero debris inside. I noticed that the vent intake door was open. When I started the jeep up it closed with the heater control on defrost/heat/vent. When I shut it off the door re-opened. Both intake vent doors are controlled by the vacuum switch attached to the heater controls. It has three ports and two vacuum tubes connected to it.

It turns out my tubes had been plugged into the wrong ports! So when the jeep was off the intake doors were open and when running the vacuum closed the doors so no air was coming in from the hood vent.

As the proud owner of jeep that no longer requires a hooded sweatswirt to stay warm in, I hope this post might help somebody else out.
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post #4 of 105 Old 01-02-2008, 09:56 PM
jcourt667
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Man, you mean I've been freezing my arse off all those years for nothing...

94 Sahara YJ 4.0L HO. 255k miles! Been down for 8 years, time to get this out of the barn!
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post #5 of 105 Old 01-03-2008, 10:24 AM
tony673
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OMG, I think I have the same problem. I guess I know where I'm spending my day off tomorrow.....under the dash of the YJ!!

I've had a draft that just won't quit ever since I replaced the body tub. I've tried everything!; duct tape, masking tape, electrical tape, spray in foam insulation, cloth-you name it. Still, my legs feel a breeze.

Maybe I messed up the tubing placement on that vacuum thingy you speak of.

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post #6 of 105 Old 01-03-2008, 03:40 PM
rhdeese
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This may work for me.....I'll try.
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post #7 of 105 Old 01-03-2008, 05:45 PM
Richmond88yj
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Oh man, 10* here this morning, post a pic or a diagram!
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post #8 of 105 Old 01-03-2008, 06:59 PM
Shenandoah
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Quote:
Originally Posted by ctm
Could you please post a picture or a diagram as to which tubes go to which port. All I know is that one is for the vacuum source on the intake manifold, one goes to the door, and the 3rd one is for A/C? Does that mean when you have A/C hooked up it is the one that _closes_ the door to recycle cool air?
Anyway, it would be cool to document this. It is not documented in the FSM or anywhere else as far as I can tell.
I agree, it would be helpful.

Turn a wrench, save a tree
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post #9 of 105 Old 01-04-2008, 08:04 AM
jeepthg
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X7

Bump to the top

.... any ideas from anyone else where to find this???

89 YJ 4.2L 33X12.5X15

upgrades since i bought it
4" lift : 33's :Rugged Ridge soft top : Dynomax exhaust : Rugged Ridge 7" flares : MC2100 :TFI : lights and dual tube front bumper: nutter bypass thanks to Richmond 88 YJ

more upgrades to come as the wife allows
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post #10 of 105 Old 01-04-2008, 10:33 AM
schizm99
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Huh

Was this a teaser thread or what?

89 YJ 4"rough country lift.
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post #11 of 105 Old 01-04-2008, 02:09 PM
doug_1994
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My heat allways roasts me out. If you want me to take a pic of mine I can.

Doug

Wise men speak because they have something to say;
Fools because they have to say something.

Plato
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post #12 of 105 Old 01-04-2008, 03:48 PM
Shenandoah
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Quote:
Originally Posted by doug_1994
My heat allways roasts me out. If you want me to take a pic of mine I can.

Doug
I would like to see how it is attached. Mine have been disconnected amny time by accident and I have gone through the attach and check procedure. But no manual (to my knowledge) shows the correct attachments.

Please post a pict, Doug.

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post #13 of 105 Old 01-04-2008, 05:34 PM
doug_1994
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Sorry guys, I went out to take a pic, but I got AC, and the air plenum is in the way. I tried to put my digi camera up behind it, but it wouldn't take.

Doug

Wise men speak because they have something to say;
Fools because they have to say something.

Plato
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post #14 of 105 Old 01-04-2008, 07:17 PM
Shenandoah
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Doug:

Could you give us a diagram of the connections? It may help.

Turn a wrench, save a tree
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post #15 of 105 Old 01-04-2008, 08:23 PM
doug_1994
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I can't even get my camera in there, let alone my fat head!

But if I ever take apart my dash, I'll take a pic.

Doug

Wise men speak because they have something to say;
Fools because they have to say something.

Plato
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