HVAC indash vacuume lines
#1
Seasoned Member
Thread Starter
Join Date: Apr 2012
Location: Abu Dhabi, UAE
Posts: 252
Likes: 0
Received 1 Like
on
1 Post
Year: 1991
Model: Cherokee (XJ)
Engine: 4.0 6cyl.
HVAC indash vacuume lines
I need to know which line goes to what .
I have a 1991 jeep cherokee xj and I had some work done on the HVAC control and also replaced the heater core. but ever since it had the work done the heater just doesn't work correctly, I notice that when the control is not in the heat position the heater control valve in pulled in, and it is in the same position when I select the heat position. so I think the vacuume lines in the dash were connected wrong, or at least the heater line is. the A/C Normal/Max works so I know the vacuume input is working along with the max/norm position. I have been looking everywhere for information where the color lines go in the dash HVAC. I mean which one is the max/normal blend door , the heater valve, etc...if anyone has this info or knows a link on line where i can get this info. I sure would appreaciate it. I have uploaded a photo to better explain the color connections I am looking for.
thanks in advance
#2
Junior Member
Join Date: Apr 2012
Location: Austin, TX
Posts: 60
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Those lines, except the black one which goes out the firewall and gets vacuum for all of them, go to blend door actuators. On my 1999 I remember the green one goes on the passenger side to either the recirculation blend door actuator or the hot/cold air blend door actuator. Yellow and blue go to a actuators on the driver side. I wanna say the yellow one is the one that controls whether it blows through the defrost or dash vents.
The Haynes manual has some good illustrations but I don't have it on me now.
Beside the video i linked below, look for videos of people taking apart the dash on your year model (ie changing heater core or evaporator etc) and you may be able to freeze the video at the right time of the disassembly and see if you can tell where they go.
The Haynes manual has some good illustrations but I don't have it on me now.
Beside the video i linked below, look for videos of people taking apart the dash on your year model (ie changing heater core or evaporator etc) and you may be able to freeze the video at the right time of the disassembly and see if you can tell where they go.
#4
Seasoned Member
Thread Starter
Join Date: Apr 2012
Location: Abu Dhabi, UAE
Posts: 252
Likes: 0
Received 1 Like
on
1 Post
Year: 1991
Model: Cherokee (XJ)
Engine: 4.0 6cyl.
Those lines, except the black one which goes out the firewall and gets vacuum for all of them, go to blend door actuators. On my 1999 I remember the green one goes on the passenger side to either the recirculation blend door actuator or the hot/cold air blend door actuator. Yellow and blue go to a actuators on the driver side. I wanna say the yellow one is the one that controls whether it blows through the defrost or dash vents.
The Haynes manual has some good illustrations but I don't have it on me now.
Beside the video i linked below, look for videos of people taking apart the dash on your year model (ie changing heater core or evaporator etc) and you may be able to freeze the video at the right time of the disassembly and see if you can tell where they go.
https://www.youtube.com/watch?v=bOSX0rIg1oo
The Haynes manual has some good illustrations but I don't have it on me now.
Beside the video i linked below, look for videos of people taking apart the dash on your year model (ie changing heater core or evaporator etc) and you may be able to freeze the video at the right time of the disassembly and see if you can tell where they go.
https://www.youtube.com/watch?v=bOSX0rIg1oo
Thread
Thread Starter
Forum
Replies
Last Post
adamrutte
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
2
11-19-2013 09:02 PM
TheGreatGazoo
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
23
08-05-2013 10:07 AM
bradszr1
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
07-22-2012 03:37 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)