Interesting A/C issue...
Senior Member
Joined: Jul 2012
Posts: 860
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From: middleburg fl
Year: 1998
Model: Cherokee
Engine: 4.0
Go look in your own FACTORY SERVICE MANUAL for Yours! It will have the same diagram. Don't have one? Maybe that's why you don't know?
This diagram is for a 95 Cherokee - Didn't they stop making the big Wagoneer years before?
Notice the blend door(s) are set by the position of the dash control slider via a cable up till 02. At that time the position became controlled by a 2 way push-pull electric motor (more complicated to do the same job,) - but still controlled by the dash slider. No actual Thermostat involved.
The variable orifice capillary tube or the small switch on the evap (also with a capillary tube too) are simply there to prevent icing.
Refer to ANY book or manual on AC.
This diagram is for a 95 Cherokee - Didn't they stop making the big Wagoneer years before?
Notice the blend door(s) are set by the position of the dash control slider via a cable up till 02. At that time the position became controlled by a 2 way push-pull electric motor (more complicated to do the same job,) - but still controlled by the dash slider. No actual Thermostat involved.
The variable orifice capillary tube or the small switch on the evap (also with a capillary tube too) are simply there to prevent icing.
Refer to ANY book or manual on AC.
ok again no blend doors in that picture cause its a WRANGLER NOT A CHEROKEE you mention once again something about blend doors blah blah operated by a slider till 02, CHEROKEES WERENT MADE IN THE USA IN 02(china yes usa no) at which time it went to a push /pull setup which makes it even more irrelavant because CHEROKEES WERENT MADE ANY MORE
now that ive had some time to digest some of youre statements it occurs to me that you are saying that they are both expansion valves because they both in fact do allow for the expansion of refrig. however if you go to a supply house and ask for an expansion valve they are going to give you a txv. if you ask for an orifice they will give you a tiny piece of brass with a hole in it one costs about 65 to over 100 dollars the other about 4 bucks
Last edited by kennzz05; Sep 10, 2012 at 12:34 PM.
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
Sorry I didn't get back sooner - life gets in the way sometimes.
OOPS - YA got me - that diagram is for a YJ!
The FSM I have is a CD - it includes both XJ and YJ. In my rush to get it printed I didn't notice the title.
I refrain from calling a YJ a Wrangler, as CJ's, YJ's, and TJ'S are also called Wranglers.
Here's that same diagram I posted, along with the one that I should have posted so you can compare them and see the difference!
I've included the front cover page so you'll know it's Chrysler's FSM, not something else.
The YJ picture I posted is on page 2110, the XJ is on page 2140.
OOPS - YA got me - that diagram is for a YJ!
The FSM I have is a CD - it includes both XJ and YJ. In my rush to get it printed I didn't notice the title.
I refrain from calling a YJ a Wrangler, as CJ's, YJ's, and TJ'S are also called Wranglers.
Here's that same diagram I posted, along with the one that I should have posted so you can compare them and see the difference!
I've included the front cover page so you'll know it's Chrysler's FSM, not something else.
The YJ picture I posted is on page 2110, the XJ is on page 2140.
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
DUH!
“”””””ok again no blend doors in that picture cause its a WRANGLER NOT A CHEROKEE”””””
The reason the blend doors aren't shown on either one is for simplicity - the text tells how to remove those components. YJ's have blend doors too. What do you think they use - wet paper towels?
SEE THE DIFFERENCE?
Here is the blend doom diagram - this is for the YJ because the XJ is the same.
“”””””ok again no blend doors in that picture cause its a WRANGLER NOT A CHEROKEE”””””
The reason the blend doors aren't shown on either one is for simplicity - the text tells how to remove those components. YJ's have blend doors too. What do you think they use - wet paper towels?
SEE THE DIFFERENCE?
Here is the blend doom diagram - this is for the YJ because the XJ is the same.
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
DUH
“””””””now that ive had some time to digest some of youre statements it occurs to me that you are saying that they are both expansion valves because they both in fact do allow for the expansion of refrig. however if you go to a supply house and ask for an expansion valve they are going to give you a txv. if you ask for an orifice they will give you a tiny piece of brass with a hole in it one costs about 65 to over 100 dollars the other about 4 bucks__________________””””””
DUH! Check the prices!
Here are the 2 types of expansion valves referred to in the previos posts:
Fixed orifice expansion valve:
http://www.jeepair.com/air-condition...-tube-1420.php
Notice it's used on the later models - TJ etc
Capillary tube expansion valve:
http://www.jeepair.com/air-condition...-valve-130.php
There were several valves used like this, depending on the year and mfgr of the AC system with minor variations. All these have the capillary tube.
The YJ did not use either of those valves - it used an electrical switch to shut off the compressor to prevent the evaporator from icing - it also had a capillary tube to sense the temperature. -- at least in '95.
YJ switch
http://www.jeepair.com/ac/4-0-liter-...linder-166.php
“””””””now that ive had some time to digest some of youre statements it occurs to me that you are saying that they are both expansion valves because they both in fact do allow for the expansion of refrig. however if you go to a supply house and ask for an expansion valve they are going to give you a txv. if you ask for an orifice they will give you a tiny piece of brass with a hole in it one costs about 65 to over 100 dollars the other about 4 bucks__________________””””””
DUH! Check the prices!
Here are the 2 types of expansion valves referred to in the previos posts:
Fixed orifice expansion valve:
http://www.jeepair.com/air-condition...-tube-1420.php
Notice it's used on the later models - TJ etc
Capillary tube expansion valve:
http://www.jeepair.com/air-condition...-valve-130.php
There were several valves used like this, depending on the year and mfgr of the AC system with minor variations. All these have the capillary tube.
The YJ did not use either of those valves - it used an electrical switch to shut off the compressor to prevent the evaporator from icing - it also had a capillary tube to sense the temperature. -- at least in '95.
YJ switch
http://www.jeepair.com/ac/4-0-liter-...linder-166.php
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
Buddy - you need to THINK before mouthing off and showing your ignorance.
When you grow up, - if you do - you'll understand that!
Just because you took something apart does not mean you understand it.
The 2000+ TJ'S had virtually the same setup as the older ones.
Need diagrams too?
Go ahead, continue to make a fool of yourself.
When you grow up, - if you do - you'll understand that!
Just because you took something apart does not mean you understand it.
The 2000+ TJ'S had virtually the same setup as the older ones.
Need diagrams too?
Go ahead, continue to make a fool of yourself.
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
The question is - DID THE OP GET HIS FIXED?
Almost forgot - the difference - One has a title, the other does not.
Almost forgot - the difference - One has a title, the other does not.
Last edited by rrich; Sep 11, 2012 at 03:58 PM.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Senior Member
Joined: Jul 2012
Posts: 860
Likes: 0
From: middleburg fl
Year: 1998
Model: Cherokee
Engine: 4.0
Buddy - you need to THINK before mouthing off and showing your ignorance.
When you grow up, - if you do - you'll understand that!
Just because you took something apart does not mean you understand it.
The 2000+ TJ'S had virtually the same setup as the older ones.
Need diagrams too?
Go ahead, continue to make a fool of yourself.
When you grow up, - if you do - you'll understand that!
Just because you took something apart does not mean you understand it.
The 2000+ TJ'S had virtually the same setup as the older ones.
Need diagrams too?
Go ahead, continue to make a fool of yourself.
and normally id have just sent you a pm telling you that but since u feel the need to be public than so be it
once again sorry to the OP for ruining his thread.And rich i am not nor claim to be an auto mechanic i normally turn to forums when i need help, thank god not everyone on here is like you, say hi to your mom when she brings youre dinner down to the basement
Wow just reread the post cant believe i forgot to call you out on youre statement about the aux fan not having anything to do with the a/c guess the fact that it comes on when the ac is on or cycles with head pressure on the later models is purely coincidental
http://t2.gstatic.com/images?q=tbn:A...m3c6LiCjZ-SI7B
Last edited by kennzz05; Sep 12, 2012 at 11:03 AM.
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
""""""Wow just reread the post cant believe i forgot to call you out on youre statement about the aux fan not having anything to do with the a/c guess the fact that it comes on when the ac is on or cycles with head pressure on the later models is purely coincidental
""""""""""
Again, your ability to read - or lack of it, astounds me.
Never said that. The fan gets turned on from the PCM via the fan relay - PCM gets several inputs from several sources, including, but not limited to, AC switch, defrost switch, and temp sending unit, as well at the evap thermostat.
Head pressure? You mean the Hi switch? (cycles the compressor, nothing to do with the fan.) You are thinking of some other type of device - refrigerator, room air conditioner etc. Same like you were thinking when you told abut orifice. expansion valves etc.
""""""""""
Again, your ability to read - or lack of it, astounds me.
Never said that. The fan gets turned on from the PCM via the fan relay - PCM gets several inputs from several sources, including, but not limited to, AC switch, defrost switch, and temp sending unit, as well at the evap thermostat.
Head pressure? You mean the Hi switch? (cycles the compressor, nothing to do with the fan.) You are thinking of some other type of device - refrigerator, room air conditioner etc. Same like you were thinking when you told abut orifice. expansion valves etc.
Last edited by rrich; Sep 12, 2012 at 01:57 PM.
Senior Member
Joined: Jul 2012
Posts: 860
Likes: 0
From: middleburg fl
Year: 1998
Model: Cherokee
Engine: 4.0
"""""when I first turn on the AC on the clutch engages and I get cool air out almost immediately"""""
"""""After a while, the air starts to blow warm, but the clutch is still engaged and turning""""""" """""This even happens on the interstate when at 2100rpm.""""""
Sounds to me like the fan is working properly -
But the evaporator is icing up.
Check the small copper tube on the expansion valve - the bulb end should be stuffed into the evaporator core to sense it's getting too cold - icing.
If it's not in fully, shove it back in.
The aux fan is to keep the engine cool, not for the AC.
"""""After a while, the air starts to blow warm, but the clutch is still engaged and turning""""""" """""This even happens on the interstate when at 2100rpm.""""""
Sounds to me like the fan is working properly -
But the evaporator is icing up.
Check the small copper tube on the expansion valve - the bulb end should be stuffed into the evaporator core to sense it's getting too cold - icing.
If it's not in fully, shove it back in.
The aux fan is to keep the engine cool, not for the AC.
well theres youre post in which you clearly post it has nothing to do with the a/c Jeez again with the mention of an evap thermostat, THERE IS NO EVAP STAT ON 97+ XJS,
oh and head pressure is hi pressure same thing hvac wise
look in the mirror and see whose yap is opened
just cuz you know how to print pictures out of a manual dosent mean you are a mechanic
please close this thread
thankfully i decided to review some of youre old posts and i see where you tend to make it youre mission to hassle and argue with people so now that i know that. I figure youre probably off youre meds this week. its ok call me what you want. i know you cant help yourself. Im sorry rrich
Last edited by kennzz05; Sep 12, 2012 at 02:29 PM.