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Old 02-15-2014, 07:23 PM   #1
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Outer Cowl question

Is it normal to feel air blowing out from the cowl? I always thought it would suck air in. Also my defrost setting has never worked, but everything else heat wise works as it should. I couldn't find the typical vacuum leaks in the popular spots.
97 4.0 no AC.

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Old 02-16-2014, 05:05 AM   #2
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I'll take guesses at this point!!! Lol

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Old 02-16-2014, 05:19 AM   #3
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Since you will take guesses.....IMO if air is blowing "out" of the cowl something is "wrong". We had a lot of dry powdery snow this winter and if starting the Jeep and turning heat/ defrost on made air come out of the Jeep it SHOULD have blown the snow away or at least moved it....nope never happened.
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Old 02-16-2014, 05:53 AM   #4
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That's what I was thinking! Thanks.
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Old 02-17-2014, 11:30 PM   #5
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Is there an easy way to get access inside the cowl? Are there any hook ups in there that could have come dis connected?
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Old 02-18-2014, 07:44 PM   #6
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Anyone?
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Old 02-18-2014, 08:10 PM   #7
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Easy to get into. Remove rubber strip in front and think 4 screws one in your cowl vent to. Remove wipers it comes off nothing in there to come loose though. My guess is closed vents or a sealed vehicle. If the air from the fan encounters more resistance getting into the vehicle it will come out there. Not a problem IMHO. Defrost not working maybe a vacuum Issue.
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Old 02-18-2014, 09:37 PM   #8
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Thanks, good info. I guess I don't need to pry in there. I'll look under the dash when it stops snowing.
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Old 02-18-2014, 10:12 PM   #9
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If defrost is not working it ISNT a vacuum issue of the normal kind. Whenever you start your jeep it's on defrost as that's the default. If you have a major (ish) vacuum leak it will stay on defrost forever. But if defrost isn't working and you feel air blowing out the cowl, you need to apologize to your lady friend for blaming that pack of m&ms that got really light that was on your dash. Jks but your cowl "could" be plugged, but I'm leaning towards something going on in the dash. Something probably has your blend door all flunked up, not letting it back to its neutral position.
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Old 02-18-2014, 10:25 PM   #10
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I was thinking pull the resistor cover at the duct beneath the glovebox (4screws) as stuff likes to build up there. (Easier to do removing glove box no tools to do that) then can get to it easier. If your not in the desert you'll find a leaf chunk at least. I still like vacuum idea too. Good luck
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Old 02-21-2014, 05:41 AM   #11
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I'll give that a shot today. It's going to be nice today, High 30s or low 40s so a projects in order before the cold returns. I did install a new resistor this year.

How do I get to the blend door to see if it's clogged or blocked?

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