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Your AC/Heater system is designed to divert to the defrost mode when the system is low or slow to hold vacuum which controls the actuator doors and if you have a vacuum leak it will cause the type of problem you are having. In order to solve this you are going to need to do some testing to trace the vacuum leak down. Are you able to do this if I send you the steps?
Okay I have enclosed the complete factory steps in the link below. Download the file and scroll down to pinpoint test A1 and follo the steps. You will need a hand held vacuum pump to check the vacuum motors if it gets that far. Start with taking a close look at the vacuum reservoir located next to the battery as its a common place for the line to leak. Post back if you have more questions and or need more help and we can work from there.https://dl.dropboxusercontent.com/u/104923897/Pinpoint%20test%20A1.pdf
They run from the intake manifold over to the vacuum reservoir and from there into the firewall and connect to the AC control panel. The supply line is the black line from the reservoir to the Ac control panel.
No, the vacuum storage reservoir for the AC system. It mounts on the battery tray. See it in the link below. Take a look at it and the lines in and out of it first, there known to break due in that area.https://dl.dropboxusercontent.com/u/104923897/VAc%20reservior%20Sep%207.pdf
No, air flow out the correct vent has nothing to do with the AC cooling. That being said the engine dose need to be running to produce vacuum.
If the line is coming off the vacuum reservoir then yes it may be a problem. There should be no breaks in the vacuum supply line.
Are you sure its a vacuum line, with the engine running do you feel any vacuum on the end of it?
The red line is the vacuum supply line from the engine and the black line is the feed line to the control panel through the firewall . The black box is the reservoir . Which line are you seeing that is loose?
Okay that line should make its way back up to the firewall. You can check it for leaks by removing it from the reservoir and applying vacuum to it, it should hold vacuum if there are no leaks from it the the AC control panel.
It should go into the firewall right next to the AC/heater plenum. Unfortunately I do not have an exact picture.
The compressor will cycle if the system is low of Freon. A vacuum leak in the system will cause the AC vent air to divert to defrost, is that now not happening?
The Freon level will not affect the air flow, only cooling.