OK guys my ac is stuck on defrost what have you guys found on this situation 

Usually a broken vacuum line somewhere

Been check in lines and haven't found one broke yet even the one going through the fire wall I have plenty of vaccume from the pump but none the the vent selector pod

Have you sucked on the line? Could be one by the CAD broken as well.

No haven't yet I'm currently at work and afraid to mess with too much till I get home encase a hose breaks

My AC on my 96 did that.  It was a vacuum line that crossed over the valve covers and got too close to the exhaust.

 

Bob

19 minutes ago, unioncreek said:

My AC on my 96 did that.  It was a vacuum line that crossed over the valve covers and got too close to the exhaust.

 

Bob

 

I'm guessing it's something simple like that.

 

@stevens cummins, Pop it in 4wd and see if the 4x4 light comes on. If not, it surely has a leak or the pump is toast.

OK guys you all was right, thanks for the help. I found the vaccume line going through the fire wall inside the foam was rotted out would have never found it if it hadnt broke trying to in hook it at the elbow  I pulled the line from behind the HVAC system an rann it out the drivers side of the fire wall cause I didn't have any line laying around now it works great