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Unread 04-07-2012, 05:25 PM   #1
leog1985
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1997 ZJ 
 
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not sure where this vacum line goes....

i dont know where this vacum line goes....my heat it stuck on defrost and not sure if this is why.it comes off the intake and goes around to the cruise control and i loose it from there.the line going to the module under the battery tray is good and not broken.cruise control works and engages.

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Unread 04-07-2012, 05:29 PM   #2
PolkaPower
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1998 ZJ 
 
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Nothing coming off of the intake correlates to the heating and cooling system.
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Unread 04-07-2012, 05:57 PM   #3
gunner44
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1997 ZJ 
 
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On my 97 grand it is caped off. Must be a add on to yours, I would cap it off until you find its connection. Thing may be working but not the right way with the Vacuum leak.
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Unread 04-07-2012, 05:59 PM   #4
jnicewan
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The other end of thart line goes through a grommet at the firewall. It is the supply line to the HVAC and probably why your HVAC doesn't work (def is the default position). The broken lne should be right behind your hand in the pic and it goes through the grommet that the a/c lines go through.
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Unread 04-07-2012, 06:01 PM   #5
gunner44
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Correction: Things may be working but not the right way with that Vacuum leak.
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Unread 04-08-2012, 06:13 AM   #6
AVR2
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I have the same issue on my 1993 ZJ - that tee is capped off, so there is no vacuum line going through the firewall to the HVAC. It looks like there used to be one, though, because there's a little indentation in the foam seal that the AC lines go through that looks just the right diameter for a vacuum line.

That tee has been capped off ever since I've had the ZJ (2 years now) and when I first got it, the AC blew through the dash vents, but only weakly, and it's got worse to the point that there's just no airflow through the vents at all. How come it ever worked at all if it's not getting a vacuum source?
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Unread 04-09-2012, 03:54 AM   #7
leog1985
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Thanks ill look on my break today.I just figured I would ask befor I rip the dash apart.....and most likley my hands too.
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Unread 04-09-2012, 04:58 PM   #8
gunner44
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Looked at your profile, You have a Grand. Manual temp control systems use vacuum, If you have a Grand you should have Auto Temp Control, uses electric motors.
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Unread 04-09-2012, 11:19 PM   #9
AVR2
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Quote:
Originally Posted by gunner44 View Post
If you have a Grand you should have Auto Temp Control, uses electric motors.
Aha! That finally explains it... Haynes implies that all the AC systems use vacuum control. Thankyou, it makes sense now Although I've still got to pull the damn dash to fix my airflow problems
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Unread 04-10-2012, 06:30 AM   #10
gunner44
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This is from my factory manual for the 97 Grand. The ATC is a option and maybe why Haynes doesn't cover it. If you can put the system in auto control with the panel dials then electric motors control the doors. I would get a some information on it, and pictures if possible, before starting to rip into it.

What I get from fast reading it the system is a mix air type so the air is never blocked, the amount that goes past the heater coils versus bypassing the coil is what the door, or flap, do. When you put it in recirculation a door blocks outside air. The fan keeps putting out the same amount of air corresponding the dial position in manual or what the brain box tells it what speed to be in to keep the temp you set.

If it was me - - I would not put the dial in AUTO, turn the fan on high, this bypassed the brain regarding fan speed. Short of a mouse nest or blocked filters, (along the outside of the front window that gets ice, snow, leaves, I will look into interior ones,) you have to be getting air. If in Auto and no filters blocked the problem would have to be is in the control module. If the door motor was not working you would get to much heat or cold air.
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Unread 04-10-2012, 09:16 AM   #11
gunner44
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Ok, I reread the hole thing, I need to get a life, The first conclusion is you are giving to little information to be of help. Second you need a factory manual, no way here, without making this the longest thread on the site, especially if the problem is in Auto. Third - what I did give you is badly written, sorry, but you should get the idea. With that said

I see no other filters except along the window under the hood. If you are using the recirculation door, by the fan, it does not show a filter. "dumb" The squirrel fan blades will be a mess from what ever has been pulled through it for the last near twenty years. I would get my vac and see what I could suck out of that area and any other, using any opening I could find including the under hood one. I would still turn off auto, both dials, to isolate the problem. I can not see any of the doors, no matter what position they are in, preventing the air form moving. All JZ Jeeps use the same housing, manual or ATC, that includes doors, etc. the difference is in the way they are operated - electric/modal or vacuum. If you are not using the recirculation button, door is closed, outside air intake is free of blockage, fan is running, you are getting air. --- unless the fan cage is gunked up. If you are using the recirculation button, move the wife's purse by her feet, away form the intake.
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Unread 04-11-2012, 02:46 PM   #12
leog1985
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i dont have climate control.i have the dials you turn on my dash.should i have the climate control in a laredo?
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Unread 04-11-2012, 03:31 PM   #13
SJZ
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Quote:
Originally Posted by leog1985 View Post
i dont have climate control.i have the dials you turn on my dash.should i have the climate control in a laredo?
ATC (Automatic Temperature Control) came standard on the Limited, not the Laredo.
My '98 has the same "t" fitting. As mentioned earlier, it goes thru the firewall and is for the vacuum actuated heat/defrost motors.
vac.jpg  
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Unread 04-11-2012, 03:35 PM   #14
monkeym38a1
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Quote:
Originally Posted by jnicewan View Post
The other end of thart line goes through a grommet at the firewall. It is the supply line to the HVAC and probably why your HVAC doesn't work (def is the default position). The broken lne should be right behind your hand in the pic and it goes through the grommet that the a/c lines go through.
What he said!
good luck!
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Unread 04-11-2012, 06:30 PM   #15
93zjbums
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Quote:
Originally Posted by SJZ View Post
ATC (Automatic Temperature Control) came standard on the Limited, not the Laredo.
My '98 has the same "t" fitting. As mentioned earlier, it goes thru the firewall and is for the vacuum actuated heat/defrost motors.
agreed had to put a piece of hose on mine to reconnect the 2 broken lines back together so it would come off of defrost its easy
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