Paul:

I recently replaced the easy one behind the glove box, which is the defrost flap. It failed at around 125K. At first you will hear a liquid, squishy sort of noise, which is the rubber diaphragm. Then, for several days I was hearing a soft knocking from inside the console, which I suspect was the partially torn diaphragm flapping around from the vacuum. Eventually there was no sound at all. I'm not looking forward to doing the 3 under the dash, but I'm guessing I'll beat the 8 hours when I do.

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Jim Wiggin
Columbus, OH
1989 300E