2 A/C vents throughput crappy - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 28 Old 02-17-2012, 02:55 PM Thread Starter
OTownDaddy
Registered User
2007 XK Commander 
 
Join Date: Feb 2012
Location: Shadow of the Mouse
Posts: 249
Wj 2 A/C vents throughput crappy

So, the weather has been fantastic recently, so I haven't been using the A/C. Yesterday, I decided to turn it on (it hit 82) and noticed that 2 of the vents weren't blowing at full power. Attached pic has them outlined in red. The other 3 have acceptable flow, although they too don't feel like the one in green (it has by far the most power.

Any ideas as to what might be the issue and a possible fix?

Attached Thumbnails
dash.jpg  

2007 XK Limited 4x4 | QD-II | 18" wheels (gotta dump these for some 17s) | The rest is stock
OTownDaddy is offline  
Sponsored Links
Advertisement
 
post #2 of 28 Old 02-17-2012, 06:25 PM
Cobra Jeep
Registered User
1993 YJ Wrangler 
 
Join Date: Aug 2005
Posts: 1,384
I have noticed my 99 does that. Exactly the same as you have pictured. The red ones do not flow very much, and the green one does, so does the one on the left of the steering wheel. Havent thought to check the one on the far right.

'93 YJ 4.0L, AX-15, NP-231HD/SYE, 8.8in rear, OME 2.5 lift, home made front hub conversion, hydroboost. Warn M10000 winch. Currently building a stroker.

'79 Cherokee Chief, 401 MPFI fuel injection, T-18/D-20 and hydroboost. Otherwise stock.
Cobra Jeep is offline  
post #3 of 28 Old 02-17-2012, 06:37 PM
Gran_Paradiso
2015 Summit
 
Gran_Paradiso's Avatar
2015 WK 
 
Join Date: Jul 2011
Location: Seven Fields
Posts: 461
Quote:
Originally Posted by Cobra Jeep
I have noticed my 99 does that. Exactly the same as you have pictured. The red ones do not flow very much, and the green one does, so does the one on the left of the steering wheel. Havent thought to check the one on the far right.
I do know the two middle ones come from one outlet. I had to add some foam to seal the channel connecting to the hvac unit. It leaked air before it came out of the vents.
Gran_Paradiso is offline  
post #4 of 28 Old 02-17-2012, 06:59 PM
gtg413i
Registered User
2003 WJ 
 
Join Date: Jun 2011
Location: Bay Area
Posts: 1,427
i notice the same thing on mine. I'd just chalk it up to another WJ thing / design flaw / quirk / uniqueness / annoyance / $$ to fix. Maybe it has to do with the heater treater I did. Did you do that to yours.

Sorry for the pessemistic attitude, just got back from trying to figure out why the WJ ran out of coolant and not too happy with why they require some special HOAT coolant. I think I solved the coolant leak due to upper radiator hose clamp being loose.
gtg413i is offline  
post #5 of 28 Old 02-17-2012, 08:02 PM
99WJdan
Registered User
1999 WJ 
 
Join Date: Aug 2011
Location: York
Posts: 599
Same here on my 99'. Also the ones on the floor blow poorly as well.

99' WJ 4.7, 3.5" lift, Bilsteins, JKS goodies, 32" Guard Dogs on 16x7 4" BS Soft 8s
Build- http://www.jeepforum.com/forum/f197/99wjdans-build-thread-1304554/
99WJdan is offline  
post #6 of 28 Old 02-17-2012, 08:34 PM Thread Starter
OTownDaddy
Registered User
2007 XK Commander 
 
Join Date: Feb 2012
Location: Shadow of the Mouse
Posts: 249
Well, at least it's not a unique issue

Quote:
Originally Posted by Gran_Paradiso View Post
I do know the two middle ones come from one outlet. I had to add some foam to seal the channel connecting to the hvac unit. It leaked air before it came out of the vents.
Do you have to remove the dash to check out what's up or can you just remove the plate around the stereo?

2007 XK Limited 4x4 | QD-II | 18" wheels (gotta dump these for some 17s) | The rest is stock
OTownDaddy is offline  
post #7 of 28 Old 02-17-2012, 08:40 PM
Gran_Paradiso
2015 Summit
 
Gran_Paradiso's Avatar
2015 WK 
 
Join Date: Jul 2011
Location: Seven Fields
Posts: 461
Quote:
Originally Posted by OTownDaddy View Post
Do you have to remove the dash to check out what's up or can you just remove the plate around the stereo?

I took the bezel trim or plate as you say and the stereo out. I bought some of that narrow foam weather strip at the hardware store and resealed the connection to the HVAC duct. My foam deteriorated and air diverted away from exiting the vents.
Gran_Paradiso is offline  
post #8 of 28 Old 04-19-2012, 03:15 PM Thread Starter
OTownDaddy
Registered User
2007 XK Commander 
 
Join Date: Feb 2012
Location: Shadow of the Mouse
Posts: 249
Reviving this as I'm thinking before it gets out of hand hot here in Orlando, I'll be needing to get this sorted. I think it needs a recharge, as it just doesn't blow as cold as expected. That's the easy part.

The 2 center vents come from the same place, seems odd that one blows like a madman and the other barely blows. Did a cursory check of the A/C path leading into the vent and all seems OK. Still wondering why one flow awesome and the other, well, blows (in a bad way).

Also, noticed the other day when I had the A/C on that when I sometimes accelerate hard, my A/C switches to come out of the defrost vents, then switches back to normal A/C vent flow. Is this a vacuum line (like the one under the battery tray) issue?

2007 XK Limited 4x4 | QD-II | 18" wheels (gotta dump these for some 17s) | The rest is stock
OTownDaddy is offline  
post #9 of 28 Old 04-19-2012, 04:01 PM
HVACNY
Registered User
2013 WK 
 
Join Date: Feb 2011
Location: East Meadow
Posts: 1,321
Quote:
Originally Posted by OTownDaddy
Reviving this as I'm thinking before it gets out of hand hot here in Orlando, I'll be needing to get this sorted. I think it needs a recharge, as it just doesn't blow as cold as expected. That's the easy part.

The 2 center vents come from the same place, seems odd that one blows like a madman and the other barely blows. Did a cursory check of the A/C path leading into the vent and all seems OK. Still wondering why one flow awesome and the other, well, blows (in a bad way).

Also, noticed the other day when I had the A/C on that when I sometimes accelerate hard, my A/C switches to come out of the defrost vents, then switches back to normal A/C vent flow. Is this a vacuum line (like the one under the battery tray) issue?
Before i fixed my blend doors i had the exact problem.Wasnt blowing cold on one side and vents were strong in the middle,weak on the sides.After the blend door fix my vents are balanced and blow hard out all of them.I dont understand how the blend doors affect velocity,but it did on mine.

2000 Jeep Grand Cherokee 4.7 V8

2013 Jeep Grand Cherokee Overland 5.7 Hemi
HVACNY is offline  
post #10 of 28 Old 04-19-2012, 04:11 PM Thread Starter
OTownDaddy
Registered User
2007 XK Commander 
 
Join Date: Feb 2012
Location: Shadow of the Mouse
Posts: 249
I don't have dual climate...but I guess I still have a blend door of sorts, right? Diverts air to defrost, floor, etc? Wonder if that's the issue...

2007 XK Limited 4x4 | QD-II | 18" wheels (gotta dump these for some 17s) | The rest is stock
OTownDaddy is offline  
post #11 of 28 Old 04-19-2012, 04:24 PM
billzcat1
Chicken in a Turkey Suit
2003 WJ 
 
Join Date: Oct 2008
Location: Redmond
Posts: 8,532
There's a mode door as well as a blend door in the MTC system. The blend door is responsible for the mix of hot and cold air and is electronic. The mode door changes the pathway through HVAC box determining which vents are blowing. This one is vacuum controlled. The blend door on MTC models doesn't have the same issue as the AZC models since it doesn't do the same calibration routine that breaks the blend door axles.

I'd say its probably an air leak in the system somewhere.
billzcat1 is offline  
post #12 of 28 Old 04-19-2012, 04:25 PM
billzcat1
Chicken in a Turkey Suit
2003 WJ 
 
Join Date: Oct 2008
Location: Redmond
Posts: 8,532
billzcat1 is offline  
post #13 of 28 Old 04-19-2012, 07:06 PM Thread Starter
OTownDaddy
Registered User
2007 XK Commander 
 
Join Date: Feb 2012
Location: Shadow of the Mouse
Posts: 249
Very interesting. Wonder if there is something at work that would make one center vent blow less than the other. Maybe they each have tubes that supply each of them? Time to check that FSM.

Now to track down vacuum lines...

2007 XK Limited 4x4 | QD-II | 18" wheels (gotta dump these for some 17s) | The rest is stock
OTownDaddy is offline  
post #14 of 28 Old 04-20-2012, 12:08 AM
MoparMan1990
Registered User
1992 XJ Cherokee 
 
Join Date: Jun 2011
Location: Chaska
Posts: 717
I've had the same issue I never really bothered to mess with it because it blows fine on the drivers side
MoparMan1990 is offline  
post #15 of 28 Old 04-20-2012, 12:12 AM
Cirruslydakota
Registered User
1999 WJ 
 
Join Date: Jun 2011
Location: Towson
Posts: 1,975
Same here, the center vent closest to the drivers side always blows more than the one on the passenger side. But since im always the driver who cares? lol But really, its a design flay, a very strange one at that. Id suspect a seal leak of some sort and the only way to correct that is to rip the dash apart. Not a fun job for sure. FWIW, I got my two front windows tinted to match the rear and so far this has helped a ton!

Bear - 1999 Jeep Grand Cherokee Laredo
Apollo - 2008 Mazdaspeed3
Vivienne - 2015 Chrysler 200S
Cirruslydakota is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Air vents grant1ja WJ Grand Cherokee Forum 6 01-27-2012 11:56 AM
Crappy Suspension on old WJ, How to revive...? bkloos WJ Grand Cherokee Forum 8 12-19-2011 09:55 AM
crappy mileage adhdlacrosse16 WJ Grand Cherokee Forum 5 11-08-2011 01:30 PM
center vents blow about 10 degrees warmer than pass vents. likely not blend doors jclaudii WJ Grand Cherokee Forum 0 06-24-2011 09:46 AM
crappy fuel mileage MGDWJ WJ Grand Cherokee Forum 1 04-09-2010 10:19 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome