I had a similar problem with a '95 Ram (different truck, I know) when I
NY. I removed the housing, cleaned it out good, and drilled two 1/8" holes in
bottom of the housing to allow air flow. It still developed a little
at the very bottom, but not much at all. And only when the humidity was high.
I guess was all the time. When I moved to CO, it never occurred again.
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