Okay i have a ac problem when i turn on the ac and put it on high it will turn on for a few seconds and then it will blow air through the defrost ports and takes some time and will blow air back to the panels. Any ideas of what might be trigering this.

 

Hello.
You did leave some information out of your question. Like, what type of truck, and A/C system you're working on. But the first answer that comes to mind is;
There is a vacuum tube located in a gromet that goes through the firewall, right behind the battery below the electrical junction there on the firewall.
The vented gasses from the battery, in many cases drys out and cracks that vacuum line. That would be the first thing I would check.
Be sure to post up any more questions or resolutions, after you check it out

 

ok i have a 2002 f150 it just started doing this i get ac air through the defrost vents instead of the panel vents i checked that line and its good not dryed out.My ac control unit is the one with three **** not the digital controlled one.

 

Have you done any maintenance on the truck recently? When the vacuum is lost, the system goes to defrost by default. So I would bet money there is a vacuum problem somewhere. Has your engine been running rough or idleing at a higher rpm?

 

mother ********* thanks tumba i persisted to look for a vacuum leak and found it it was burnt through very hidden wouldn be able to tell until i moved it and heard a hissing sound. My engine was runnning rough and idling lower and higher also had the lean codes but cleaned my maf and it has been gone for 70 something miles.

 

You're welcome. It is the most common reason for that problem

 

Whenever someone has a vacuum problem I always refer them to the nearest female, they seem to know how to fix those things

 

When they get my age, the bag is full and needs divorcing, thats how you fix a female vacuum leak.

Also, you posted this in the wrong thread.

 

lol you guys are crazy now i just need to replace it with something that wont burn through