You are looking for a vacuum leak. The vent actuators are run by vacuum. If there is a leak, this is what happens. Check under the dash for disconnected or broken hoses. Also, with this many miles, check under the hood, especially where the vacuum hose comes through the firewall for leaks. Many times the small plastic hoses will break or melt and create a leak. NOTE: With the engine running, you may be able to hear a hissing sound where there is a leak.
Let me know what you find.
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Thursday, October 8th, 2009 AT 10:47 AM