Question about 2000 Chrysler Concorde
You can fix it using vacuum hose from your local parts dealer, you may need some fittings as well. You should fix it since your engine relies on the vacuum for various other things.
Posted on Feb 12, 2012
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Posted on Jan 02, 2017
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If the AC/heater air control doesn't work, you most likely have a vacuum line broken. All the air flow doors in the heater system are vacuum operated and without it the air will blow out of the windshield defrost vents. The common place for a vacuum line to break is under the hood where the lines pass near a hot area. The vacuum lines are normally a rigid black plastic tubing about 3/16 inch in diameter. They run across the engine compartment fastened to the section just below the wipers and air vent. The tube goes through the dash, usually near the steering column. When the tubing has been hot for long time it becomes brittle and cracks or breaks. Trace this tubing looking for a crack or break. The easiest repair is to cut out the broken section and replace it with rubber hose of the correct diameter. The hose needs to have an inside diameter that will fit snugly on to the vacuum tubing.
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Jul 26, 2011 | 1996 Buick Park Avenue
The air controls in the heat/AC system are vacuum operated. When the controls don't cause the air flow to shift it is normally caused by lack of vacuum to the air flow system. This is normally caused by a break in a vacuum or a vacuum line that has come loose from a connection, usually under the hood. These vacuum lines are small black plastic tubes about 1/8 to 3/16 in diameter. My experience has been that places under the hood where these lines are exposed to high heat causes them to get brittle and break or crack. I have found lines that are between the battery and fire wall that don't get much air flow and are heated by the battery are a likely place to look. Look for the line that goes through the fire wall. that is likely the damaged line. Trace it back to find the crack or break. If you find this is the cause, replace all the section of line that is brittle. If you don't do that you will have the same problem again very soon. You can splice sections of this tubing with rubber hose of the proper inside diameter. Good luck.
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