Good news is that you don't have a 'blend door' problem. Sounds more like a vacuum problem. Do you here any hissing sound under the dash? Take the black cover off thats under the dash and over the tranny hump for better acess. Another place to look is, check the black hose that runs between the battery and the firewall. This hose is a very common failure problem.
Last edited by torkum; 09-30-2007 at 08:35 AM.