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Old 01-27-2014, 03:13 PM   #1
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Cowl vent

While my jeep is sitting running in the drive way with the heater on heat the temp control all the way on hot and the fan speed of the highest setting should the vent door on the passenger side inside the cowl be open or closed? And should it be any different while driving?

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Old 01-27-2014, 03:23 PM   #2
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The cowl gate should be open. The fresh air vent inside the cab should be closed.

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Old 01-27-2014, 03:30 PM   #3
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search "YJ Heating System Explained"
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Old 01-27-2014, 03:38 PM   #4
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I found it right after I posted I was looking for it before I posted and no luck. So I guess at this point I will assume I need a heater core all the doors are working properly I put a hard top and hard doors on the jeep with no air leaks the temp gauge is reading correct the blower blows In all three stages and it even blows some pretty warm air out but yet it doesn't seem to get that warm in there I'm just lost at this point
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Old 01-27-2014, 03:45 PM   #5
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The cowl vent on the passenger side is a vacuum assisted door inside the heater box. From what you said, that door should be open.

It is normally always open. That is how your heater gets the air needed to operate. If you shut off the selector lever, i.e. def/heat/vent, then you should be able to hear the door slap shut once the vacuum switch is operated. In the "off" position of this lever it also shuts off the fan.

The vacuum only holds it closed, it doesn't use vacuum to open it up. At least that's the way mine is, and that's the way it was written in the sticky "YJ heating system explained".
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Old 01-28-2014, 05:48 AM   #6
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Would having no carpet really affect the temp of the inside of the jeep
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Old 01-28-2014, 06:12 AM   #7
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And could my temp gauge be working correct but my thermostat be messed up I'm just so lost with this heat problem. It blows kinda warm but don't get that warm
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Old 01-28-2014, 06:18 AM   #8
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The temp gauge could be right and your thermostat stuck open or the wrong open temp. Go buy a 195 degree thermostat and change it out they are easy to do.
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Old 01-28-2014, 09:38 AM   #9
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You might wanna consider back-flushing your heater core, too. What does your anti-freeze look like?
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Old 01-28-2014, 09:55 AM   #10
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Quote:
Originally Posted by Mv7fd View Post
Would having no carpet really affect the temp of the inside of the jeep
Not really, only thing is the floor can get pretty hot while driving along. So not related to ur problem
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Old 01-28-2014, 11:20 AM   #11
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I flushed the heater core before and anti freeze is a little brown but it'll blow hot air out at my feet but the jeep just won't get that warm inside
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Old 01-28-2014, 11:31 AM   #12
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What do u mean by that warm? Most jeeps wont get 'hot' inside, but my yj with a soft top and half doors keeps me plenty warm so if ur cold after the engine is warm there is a problem. Is the inside of ur cowl vent clean? If it gets clogged with leaves inside it can stop the air flow enough to make a difference
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Old 01-28-2014, 11:52 AM   #13
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By warm I mean when it comes out at my feet it's pretty warm but you move your hands further away from the vents and it's cold. And the cowl vent is open and clear
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Old 01-28-2014, 11:57 AM   #14
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I'm going to replace the thermostat and blow the heater core out again and change the anti freeze but when the heats comes out of the vents it's hot but the jeep don't get that hot inside
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Old 01-28-2014, 12:54 PM   #15
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What about air leaks. I know the yjs do not seals that great. I have noticed that sometimes my driver door does not shut and it manages to force cold air on your left arm. With heat on hot and high my feet will sweat when the outside temp is above 20 degrees.
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Old 01-28-2014, 01:27 PM   #16
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I guess because it's 1 degree out it can't keep up
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Old 01-28-2014, 02:23 PM   #17
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I guess because it's 1 degree out it can't keep up
Well maybe that is ur problem but it shouldnt be my yj with softtop can keep me warm in -30 degrees as a matter of fact it did it last week. I would say that there is a problem somewhere. Check any places you may have a massive amount of cold air coming into the jeep (floor pan drains, where the windows seat against the windshield frame, maybe where the roof meets the windshield?) If there are no major gaps then i would say that you have an issue in the heater core. The air coming out of my defrost vents (i never use floor vents) is so hot that i cant stand to hold my hand above it at full blast
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Old 01-28-2014, 03:16 PM   #18
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I think I may have found my problem with the heater turned on full blast I was running my hand around the heater box and around the bottom of the heater box on the passenger side I feel a lot of cold air so maybe my my box isn't sealed tight or I have a hole or something I don't know but I defiantly felt cold air there
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Old 01-28-2014, 03:24 PM   #19
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On my 95 2.5l while the temp is 190 defrost on high the heat is 20 degrees cooler coming out of the driver side. I used a temp gauge on it 130 on the passenger side and 110 on the drivers side. It all comes from the same tube so I don't know what is going on. And on the floor it's the opposite the driver side is hot and the passenger is not
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Old 01-28-2014, 04:49 PM   #20
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Can anyone think of any reason why I'd be getting cold air between the fire wall and the heater box just on the passenger side
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Old 01-28-2014, 05:19 PM   #21
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The cowl vent could be unhooked from the top of the heater box
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Old 01-28-2014, 05:48 PM   #22
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That's true too either way I found where a lot of cold air is coming in

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