Read a million threads with search ..but wanted to share my problem and confirm i am looking in right directions in order to fix. Just driving along yesterday on Max AC no issues.....then all of a sudden the blowing power out of the vents got to be half of what it was and the temp was no where near as cold as it was. It sounded like i could hear a fan of some sort slowing down behind the dash on passenger side. Just something back there ws making a funky sound. But either way got it home and started messing around trying stuff. I turned the **** to normal a/c and it blows harder and colder on that setting then it does on max A/c now. But all air is still not as cold as it was or should be.

Then for ****s and giggles tried to engage 4WD and sure enough the transfer case engaged as the front drivesgaft was spinning but didnt seem that the hubs engaged and just sitting there in 4WD touching nothing the air went from vents with weak power...then a surge of power came on and it switched to blowing out the defrost for a while....then loss of blowing power came on and went back to vents.


So after reading my story.......Where should i be looking for a fix or "fix's lol And what are the best fixes for problems you think i have

Thanks Guys
Tony

 

My first guess would be a vacuum problem.
Check the hoses going to the front hubs from the solenoid.

May also be a problem in the hub seals.

(sounds like textbook vacuum issues)


As far as the a/c ,check for an obstruction at the intake for the airbox.(under the rt.side dash)

 

Agree with the above post. SOunds like a vacuum issue. The only other issue that sounds a little out of the ordinary, is the part about the fan sounded like it slowed down. You might have sucked in a piece of trash into the intake that could be fouling the airflow and/or the door that directs the flow.

 

x3 on the vacuum issue, but no clue on the A/C issue...

 

Thx guys i will start checking this evening or tomorrow. Figures i start having problems when its the hottest it has been HAHA Definitely going to trace and probably replace all vacuum lines running to and from anyhow just to be safe. The nois ei heard that initiated the a/c issue is not there anymore...but the low blowing power on max ac and warmer then normal air is there and stronger blowing power and colder air on normal a/c/ Is this related or could be to the vacuum issue as well? Or i am looking at tracking another problem?

 

Good luck and come back and tell us what you found, it could help us out one day, sounds like the problem the guys mentioned above...

 

It could be. I have the valve that closes off the water flow to the heater core for colder ac. I was working on my turbo and pulled the vacuum line off that actuates that valve and I had a similar problem. If I put the AC on normal ac first than I could switch it to max ac and it would work, but if I started the truck in max ac, it would come out the defrosters. So the moral of the story is, I had a vacuum leak and it certainly effected the way the diverter door worked.

 

i would say your are tracking another problem, i changed out an auto locking hub and changed out the lines on both sides of the truck and i havent had another problem with my auto 4x4 since but my vents change to defrost still when i kick it in 4. my ac blows hot and cold at will but ive actually never tried putting it on reg ac...

 

You have a vacuum leak !

 

Yea, I would say one of the o-rings or the knuckle seal in the hub(s) is your problem.

 

Just an quick update when i had time thsi evening i poked around. Found the AC noise/ blowing less then normal etc. There was a plastic bag from when my gf went shopping the other day sucked up under the glovebox blocking/clogging the area right there. Once that was removed...a/c is working normal with regards to the noise and blowing problem. As far as the quick look around the vacuum lines concerning the 4wd....i replaced the hoses going from the hub up to the connections right there at the frame since i noticed the lines looked old and one had a slight tear in it. After that the 4wd is still not working and a/c goes to the defroster when in 4wd.

So is it common to have leaks from the plastic line for the one across the frame? I glanced at it and looked liek nothing would be an issue as well as looking under the hood all connections look fine. Just curious where or what to check next to find the vacuum leak.

Thx guys

 

same problems here, when i put mine in 4 low the a/c quits blowing and the motor revs up to a higher steady rpm. I just thought vacuum line for both problems, havent messed with it though.

 

What I would do is take the line off near the shock mount and vacuum test it. Take it to Auto Zone or some other place that you can rent a vacuum tester and see if the hubs hold a vacuum. I would say its a long shot for those lines to be messed up, but anything is possible. I would still bet on the hub seals.

 

Quick and easy way to check vacuum issues;

Pull the vacuum line off at the right hub and plug.(golf tee,small screw etc.)

Try the a/c, if it does work,the problem is in that hub.

If it does not,reconnect and repeat for the left hub.

If the a/c defaults after isolating both hubs,most likely a leak in the lines from the solenoid to the hubs.

If the a/c works after isolating one of the hubs, and not the other,the leak is in that hub.

 

thanks, i will try that this weekend.