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Re: 2005 Astro Van AC only blowes through windshield...
The mode doors in the dash are powered by engine vacuum, if vacuum is missing the default setting is the defrost vent. Look under the hood near the firewall for a disconnected vacuum line.
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Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door. The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents. When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear. You can do an internet search for "repair durango blend door" for more info.
This sounds like a vacuum leak. When there is a vacuum leak it defaults to defrost as a safety precaution. You will have to track down where the leak is and repair it.
If it is blowing hot air out of the defroster and not out of the heater vents then the door that directs the heat from the defroster isn't working properly it is blocking the heat from going to the heater vents. Also check the cold air door. It sounds like it isn't closing all the way to shut off the cold air and not letting the hot air pass.
unhook battery, rehook battery, turn key on, ..............wait 2 minutes, then start truck and ck a/c. sometimes it works, if not, it will need to be checked by a shop .
SOUNDS LIKE THE AC CONTROL HAS LOST VACUUM FROM THE ENGINE, YOU MAY HAVE KNOCKED A HOSE OFF WHILE CHANGING THE FAN CLUTCH, IS THE AIR COMING OUT THE DEFROST VENTS BY CHANCE?
THERE IS A VACUUM LINE THAT GOES FROM THE LEFT FRONT OF THE ENGINE TO THE VACUUM CHECK VALVE NEAR THE ACCUMULATOR. IF THAT LINE IS BROKEN THE PROBLEM YOU HAVE IS NO HVAC MODE SWITCHING.
You have a vacuum leak in the system that controls the vent doors. First check for cracks at the vacuum reservoir, then check the various vacuum hoses and vacuum motors for a leak.
Charlie
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