My 2000 Century had the exact same problem. After a little searching I found the vacuum line from the manifold into the passenger cabin had a significant hole in it. The hole was where the line passes under the battery. Looks like some acid from the battery ate thru. I cut the line back, reterminated it, and it works Great!!!!!!! Hope yours is as easy!!!
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Originally Posted by jwichman
Please help, need to find the vacuum source that provides vacuum to the HVAC mode switch on the dash controls. My modes are stuck somewhere in the middle. I took the vacuum lines off the back of the mode switch, found no noticable vacuum at any of the lines. I then hooked up a small hand vacuum pump to each and found that the dampers move when vacuum is applied. Can anyone tell me where the vacuum source is for this control? Does anyone know where I can find a vacuum schematic diagram? Just prior to losing the vacuum control I heard a whine from under the hood. I switched the control from max ac to vent, shutting off the compressor, and the whine stopped. I returned to max ac and the compressor started again (no whine) but had no mode control. Any other thoughts?
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