PDA

View Full Version : Heat/AC Control Panel Help - Please


Crist Clapper
02-12-2015, 02:54 PM
The heat/AC controls do not work as they should. Off to On okay. All other settings blow to the defroster setting. Help?

http://i873.photobucket.com/albums/ab291/clapperc/GWDocument003.jpg
prerunner1982
02-12-2015, 04:00 PM
If it defaults to defroster there is a vacuum leak somewhere. Find the ball behind the passenger side of the front bumper and start tracing the vacuum lines to check for breaks, cracks, or disconnected hoses.
4.3LXJ
02-12-2015, 04:05 PM
2 on the vacuum leak
xj-jake
02-12-2015, 04:10 PM
These guys nailed it.
Crist Clapper
02-12-2015, 07:04 PM
Oh no... Say it ain't so! It's related to that so-silly placed tank in the front-bumper! :P
4.3LXJ
02-12-2015, 07:58 PM
That would be it. The secret bomb that goes off and destroys anyone you hit :D
Crist Clapper
02-13-2015, 11:30 AM
I'm not so good at the mechanical stuff... Having the engine running seemed to be the secret... :smiley-scared003: Be kind to me... I've still got a lot to learn! :o
4.3LXJ
02-13-2015, 11:52 AM
OK, here is food for thought for you then. There should be some vacuum in the system, at least on a short term basis. There should be a check valve before the vacuum reservoir and another one in the line that goes to the axle lock to prevent it from coming out of 4WD in low vacuum situations
autotech98
02-13-2015, 06:43 PM
Chris a quick place to look is right under tha battery on the side towards firewall. Have had several friends with this problem and they all had a crcked hose right at the connetor in this location. Not saying thats it but pretty common problem.
Crist Clapper
02-13-2015, 07:38 PM
When I started this thread I did not have the engine running... As soon as I started the engine... All the settings now work okay! What am I missing?
4.3LXJ
02-13-2015, 07:49 PM
All those settings are run by vacuum diaphragms. It defaults to defrost just in case you loose vacuum
Pastorjosh
02-16-2015, 04:04 PM
There isn't any vacuum if the engine isn't running. That's why you had trouble.


Sent from my iPhone using Tapatalk
Crist Clapper
02-16-2015, 05:18 PM
For the mechanically-challenged like myself... As soon as I read vacuum... I then figured I needed a source like the engine! ZoomZoom


There isn't any vacuum if the engine isn't running. That's why you had trouble.


Sent from my iPhone using Tapatalk