Yes, I have the same problem, and have posted about it a few times. I have gone over the air system looking for leaks many times, and have replaced several fittings and parts, but when the temps get down close to freezing or below, my pump cycles and cycles. In fact I recently wired in a switch to the driver's area to be able to turn the pump off when it gets to be too much. I guess the only thing to do is crawl under when it's cold and squirt down the fittings, but that really doesn't enthuse me, maybe better to keep heading south:-)
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Bill B
2007 Navigator, 45' Series 60
Full-Timing since 2004
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