My 84 GW heater does not blow defrost air, although the heater itself
works fine. I believe it is not responding to the defroster button
switch. I suspect that I have mis-connected the vacuum lines to the
side of the heater control box. Does anyone have a diagram of how the
color-coded vac lines are supposed to be connected?

Thanks!

Randall Brink

 

Dunno if this will help you, but you can try this:
<URL:http://www.a-v-t.com/XJHeater.pdf>
Page 13 of the PDF has an "Air Conditioning Control System Vacuum
Schematic" -- but it is a scan from the 1988 Cherokee manual, not your
`84 GW.

Just in case you can't open PDFs, it says that Green should run from the
end cap of the defrost door motor and go to port 6 on the switch. Port
5 should be plugged. Blue should run from the side of the door motor
and go to port 4 on the switch.

I got it from the last message in this thread in a Full Size Jeep forum:
<URL:http://www.ilovejeeps.com/forums/showthread.php?s=1be87cfdd512ebe34cb8594ecd0181be& threadid=9635>

Sounds like you've got an /adventure/ on your hands with the GW,
Randall. Good luck.


randallbrink@adelphia.net wrote:
> My 84 GW heater does not blow defrost air, although the heater itself
> works fine. I believe it is not responding to the defroster button
> switch. I suspect that I have mis-connected the vacuum lines to the
> side of the heater control box. Does anyone have a diagram of how the
> color-coded vac lines are supposed to be connected?
>
> Thanks!
>
> Randall Brink
>

 

Dunno if this will help you, but you can try this:
<URL:http://www.a-v-t.com/XJHeater.pdf>
Page 13 of the PDF has an "Air Conditioning Control System Vacuum
Schematic" -- but it is a scan from the 1988 Cherokee manual, not your
`84 GW.

Just in case you can't open PDFs, it says that Green should run from the
end cap of the defrost door motor and go to port 6 on the switch. Port
5 should be plugged. Blue should run from the side of the door motor
and go to port 4 on the switch.

I got it from the last message in this thread in a Full Size Jeep forum:
<URL:http://www.ilovejeeps.com/forums/showthread.php?s=1be87cfdd512ebe34cb8594ecd0181be& threadid=9635>

Sounds like you've got an /adventure/ on your hands with the GW,
Randall. Good luck.


randallbrink@adelphia.net wrote:
> My 84 GW heater does not blow defrost air, although the heater itself
> works fine. I believe it is not responding to the defroster button
> switch. I suspect that I have mis-connected the vacuum lines to the
> side of the heater control box. Does anyone have a diagram of how the
> color-coded vac lines are supposed to be connected?
>
> Thanks!
>
> Randall Brink
>

 

Dunno if this will help you, but you can try this:
<URL:http://www.a-v-t.com/XJHeater.pdf>
Page 13 of the PDF has an "Air Conditioning Control System Vacuum
Schematic" -- but it is a scan from the 1988 Cherokee manual, not your
`84 GW.

Just in case you can't open PDFs, it says that Green should run from the
end cap of the defrost door motor and go to port 6 on the switch. Port
5 should be plugged. Blue should run from the side of the door motor
and go to port 4 on the switch.

I got it from the last message in this thread in a Full Size Jeep forum:
<URL:http://www.ilovejeeps.com/forums/showthread.php?s=1be87cfdd512ebe34cb8594ecd0181be& threadid=9635>

Sounds like you've got an /adventure/ on your hands with the GW,
Randall. Good luck.


randallbrink@adelphia.net wrote:
> My 84 GW heater does not blow defrost air, although the heater itself
> works fine. I believe it is not responding to the defroster button
> switch. I suspect that I have mis-connected the vacuum lines to the
> side of the heater control box. Does anyone have a diagram of how the
> color-coded vac lines are supposed to be connected?
>
> Thanks!
>
> Randall Brink
>

 

Lee:

This set of diagrams, plus your advice, is exactly what I needed to
sort out the functions of the vacuum on the heater control box.

Many thanks!

Randall

 

Lee:

This set of diagrams, plus your advice, is exactly what I needed to
sort out the functions of the vacuum on the heater control box.

Many thanks!

Randall

 

Lee:

This set of diagrams, plus your advice, is exactly what I needed to
sort out the functions of the vacuum on the heater control box.

Many thanks!

Randall

 

Glad it worked out for you. Thanks very much for getting back to the
group and letting us know.


randallbrink@adelphia.net wrote:
> Lee:
>
> This set of diagrams, plus your advice, is exactly what I needed to
> sort out the functions of the vacuum on the heater control box.
>
> Many thanks!
>
> Randall
>

 

Glad it worked out for you. Thanks very much for getting back to the
group and letting us know.


randallbrink@adelphia.net wrote:
> Lee:
>
> This set of diagrams, plus your advice, is exactly what I needed to
> sort out the functions of the vacuum on the heater control box.
>
> Many thanks!
>
> Randall
>

 

Glad it worked out for you. Thanks very much for getting back to the
group and letting us know.


randallbrink@adelphia.net wrote:
> Lee:
>
> This set of diagrams, plus your advice, is exactly what I needed to
> sort out the functions of the vacuum on the heater control box.
>
> Many thanks!
>
> Randall
>